Add files necessary to run Expat configure.

[wxWidgets.git] / interface / wx / log.h

diff --git a/interface/wx/log.h b/interface/wx/log.h
index 50042f4262e563e195cb6c61bf30f034c336aead..22406b53ba55d19090e81c3e6bc0f9296dfcae5f 100644 (file)
--- a/interface/wx/log.h
+++ b/interface/wx/log.h
@@ -1,15 +1,16 @@
 /////////////////////////////////////////////////////////////////////////////
 // Name:        log.h
 /////////////////////////////////////////////////////////////////////////////
 // Name:        log.h

-// Purpose:     interface of wxLogWindow
+// Purpose:     interface of wxLog* classes

 // Author:      wxWidgets team
 // RCS-ID:      $Id$
 // Author:      wxWidgets team
 // RCS-ID:      $Id$

-// Licence:     wxWindows license
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

+#if wxUSE_BASE

 
 /**
     Different standard log levels (you may also define your own) used with
 
 /**
     Different standard log levels (you may also define your own) used with

-    by standard wxLog functions wxLogError(), wxLogWarning(), etc...
+    by standard wxLog functions wxLogGeneric(), wxLogError(), wxLogWarning(), etc...

 */
 enum wxLogLevelValues
 {
 */
 enum wxLogLevelValues
 {


@@ -37,8 +38,23 @@ typedef unsigned long wxLogLevel;
 /**
     Information about a log record (unit of the log output).
  */
 /**
     Information about a log record (unit of the log output).
  */

-struct wxLogRecordInfo
+class wxLogRecordInfo

 {
 {

+public:
+    /// The name of the file where this log message was generated.
+    const char *filename;
+
+    /// The line number at which this log message was generated.
+    int line;
+
+    /**
+        The name of the function where the log record was generated.
+
+        This field may be @NULL if the compiler doesn't support @c __FUNCTION__
+        (but most modern compilers do).
+     */
+    const char *func;
+

     /// Time when the log message was generated.
     time_t timestamp;
 
     /// Time when the log message was generated.
     time_t timestamp;
 


@@ -54,964 +70,1118 @@ struct wxLogRecordInfo
 };
 
 /**
 };
 
 /**

-    @class wxLogWindow
+    @class wxLogFormatter

 
 

-    This class represents a background log window: to be precise, it collects all
-    log messages in the log frame which it manages but also passes them on to the
-    log target which was active at the moment of its creation. This allows you, for
-    example, to show all the log messages in a frame but still continue to process
-    them normally by showing the standard log dialog.
+    wxLogFormatter class is used to format the log messages. It implements the
+    default formatting and can be derived from to create custom formatters.
+
+    The default implementation formats the message into a string containing
+    the time stamp, level-dependent prefix and the message itself.
+
+    To change it, you can derive from it and override its Format() method. For
+    example, to include the thread id in the log messages you can use
+    @code
+        class LogFormatterWithThread : public wxLogFormatter
+        {
+            virtual wxString Format(wxLogLevel level,
+                                    const wxString& msg,
+                                    const wxLogRecordInfo& info) const
+            {
+                return wxString::Format("[%d] %s(%d) : %s",
+                    info.threadId, info.filename, info.line, msg);
+            }
+        };
+    @endcode
+    And then associate it with wxLog instance using its SetFormatter(). Then,
+    if you call:
+
+    @code
+        wxLogMessage(_("*** Application started ***"));
+    @endcode
+
+    the log output could be something like:
+
+    @verbatim
+        [7872] d:\testApp\src\testApp.cpp(85) : *** Application started ***
+    @endverbatim

 
     @library{wxbase}
     @category{logging}
 
 
     @library{wxbase}
     @category{logging}
 

-    @see wxLogTextCtrl
+    @see @ref overview_log
+
+    @since 2.9.4

 */
 */

-class wxLogWindow : public wxLogInterposer
+class wxLogFormatter

 {
 public:
     /**
 {
 public:
     /**

-        Creates the log frame window and starts collecting the messages in it.
-
-        @param pParent
-            The parent window for the log frame, may be @NULL
-        @param szTitle
-            The title for the log frame
-        @param show
-            @true to show the frame initially (default), otherwise
-            Show() must be called later.
-        @param passToOld
-            @true to process the log messages normally in addition to
-            logging them in the log frame (default), @false to only log them in the
-            log frame.
+        The default ctor does nothing.

     */
     */

-    wxLogWindow(wxWindow* pParent, const wxString& szTitle, bool show = true,
-                bool passToOld = true);
+    wxLogFormatter();

 
 

-    /**
-        Returns the associated log frame window. This may be used to position or resize
-        it but use Show() to show or hide it.
-    */
-    wxFrame* GetFrame() const;

 
     /**
 
     /**

-        Called if the user closes the window interactively, will not be
-        called if it is destroyed for another reason (such as when program
-        exits).
+        This function creates the full log message string.

 
 

-        Return @true from here to allow the frame to close, @false to
-        prevent this from happening.
+        Override it to customize the output string format.

 
 

-        @see OnFrameDelete()
-    */
-    virtual bool OnFrameClose(wxFrame* frame);
+        @param level
+            The level of this log record, e.g. ::wxLOG_Error.
+        @param msg
+            The log message itself.
+        @param info
+            All the other information (such as time, component, location...)
+            associated with this log record.

 
 

-    /**
-        Called immediately after the log frame creation allowing for
-        any extra initializations.
-    */
-    virtual void OnFrameCreate(wxFrame* frame);
+        @return
+            The formated message.

 
 

-    /**
-        Called right before the log frame is going to be deleted: will
-        always be called unlike OnFrameClose().
+        @note
+            Time stamping is disabled for Visual C++ users in debug builds by
+            default because otherwise it would be impossible to directly go to the line
+            from which the log message was generated by simply clicking in the debugger
+            window on the corresponding error message. If you wish to enable it, override
+            FormatTime().

     */
     */

-    virtual void OnFrameDelete(wxFrame* frame);
+    virtual wxString Format(wxLogLevel level,
+                            const wxString& msg,
+                            const wxLogRecordInfo& info) const;

 
 

+protected:

     /**
     /**

-        Shows or hides the frame.
-    */
-    void Show(bool show = true);
-};
+        This function formats the time stamp part of the log message.

 
 

+        Override this function if you need to customize just the time stamp.

 
 

+        @param time
+            Time to format.

 
 

-/**
-    @class wxLogInterposerTemp
-
-    A special version of wxLogChain which uses itself as the new log target.
-    It forwards log messages to the previously installed one in addition to
-    processing them itself. Unlike wxLogInterposer, it doesn't delete the old
-    target which means it can be used to temporarily redirect log output.
-
-    As per wxLogInterposer, this class must be derived from to implement
-    wxLog::DoLog and/or wxLog::DoLogString methods.
-
-    @library{wxbase}
-    @category{logging}
-*/
-class wxLogInterposerTemp : public wxLogChain
-{
-public:
-    /**
-        The default constructor installs this object as the current active log target.
+        @return
+            The formated time string, may be empty.

     */
     */

-    wxLogInterposerTemp();
+    virtual wxString FormatTime(time_t time) const;

 };
 
 
 };
 
 

-

 /**
 /**

-    @class wxLogChain
-
-    This simple class allows you to chain log sinks, that is to install a new sink but
-    keep passing log messages to the old one instead of replacing it completely as
-    wxLog::SetActiveTarget does.
-
-    It is especially useful when you want to divert the logs somewhere (for
-    example to a file or a log window) but also keep showing the error messages
-    using the standard dialogs as wxLogGui does by default.
+    @class wxLog

 
 

-    Example of usage:
+    wxLog class defines the interface for the <em>log targets</em> used by wxWidgets
+    logging functions as explained in the @ref overview_log.

 
 

-    @code
-    wxLogChain *logChain = new wxLogChain(new wxLogStderr);
+    The only situations when you need to directly use this class is when you want
+    to derive your own log target because the existing ones don't satisfy your
+    needs.

 
 

-    // all the log messages are sent to stderr and also processed as usually
-    ...
+    Otherwise, it is completely hidden behind the @ref group_funcmacro_log "wxLogXXX() functions"
+    and you may not even know about its existence.

 
 

-    // don't delete logChain directly as this would leave a dangling
-    // pointer as active log target, use SetActiveTarget() instead
-    delete wxLog::SetActiveTarget(...something else or NULL...);
-    @endcode
+    @note For console-mode applications, the default target is wxLogStderr, so
+          that all @e wxLogXXX() functions print on @c stderr when @c wxUSE_GUI = 0.

 
     @library{wxbase}
     @category{logging}
 
     @library{wxbase}
     @category{logging}

+
+    @see @ref overview_log, @ref group_funcmacro_log "wxLogXXX() functions"

 */
 */

-class wxLogChain : public wxLog
+class wxLog

 {
 public:
     /**
 {
 public:
     /**

-        Sets the specified @c logger (which may be @NULL) as the default log
-        target but the log messages are also passed to the previous log target if any.
+        @name Trace mask functions

     */
     */

-    wxLogChain(wxLog* logger);
+    //@{

 
     /**
 
     /**

-        Destroys the previous log target.
-    */
-    virtual ~wxLogChain();
+        Add the @a mask to the list of allowed masks for wxLogTrace().

 
 

-    /**
-        Detaches the old log target so it won't be destroyed when the wxLogChain object
-        is destroyed.
+        @see RemoveTraceMask(), GetTraceMasks()

     */
     */

-    void DetachOldLog();
+    static void AddTraceMask(const wxString& mask);

 
     /**
 
     /**

-        Returns the pointer to the previously active log target (which may be @NULL).
+        Removes all trace masks previously set with AddTraceMask().
+
+        @see RemoveTraceMask()

     */
     */

-    wxLog* GetOldLog() const;
+    static void ClearTraceMasks();

 
     /**
 
     /**

-        Returns @true if the messages are passed to the previously active log
-        target (default) or @false if PassMessages() had been called.
+        Returns the currently allowed list of string trace masks.
+
+        @see AddTraceMask().

     */
     */

-    bool IsPassingMessages() const;
+    static const wxArrayString& GetTraceMasks();

 
     /**
 
     /**

-        By default, the log messages are passed to the previously active log target.
-        Calling this function with @false parameter disables this behaviour
-        (presumably temporarily, as you shouldn't use wxLogChain at all otherwise) and
-        it can be reenabled by calling it again with @a passMessages set to @true.
+        Returns @true if the @a mask is one of allowed masks for wxLogTrace().
+
+        See also: AddTraceMask(), RemoveTraceMask()

     */
     */

-    void PassMessages(bool passMessages);
+    static bool IsAllowedTraceMask(const wxString& mask);

 
     /**
 
     /**

-        Sets another log target to use (may be @NULL).
+        Remove the @a mask from the list of allowed masks for
+        wxLogTrace().

 
 

-        The log target specified in the wxLogChain(wxLog*) constructor or in a
-        previous call to this function is deleted.
-        This doesn't change the old log target value (the one the messages are
-        forwarded to) which still remains the same as was active when wxLogChain
-        object was created.
+        @see AddTraceMask()

     */
     */

-    void SetLog(wxLog* logger);
-};
+    static void RemoveTraceMask(const wxString& mask);

 
 

+    //@}

 
 
 
 

-/**
-    @class wxLogGui

 
 

-    This is the default log target for the GUI wxWidgets applications.
+    /**
+        @name Log target functions
+    */
+    //@{

 
 

-    Please see @ref overview_log_customize for explanation of how to change the
-    default log target.
+    /**
+        Instructs wxLog to not create new log targets on the fly if there is none
+        currently (see GetActiveTarget()).

 
 

-    An object of this class is used by default to show the log messages created
-    by using wxLogMessage(), wxLogError() and other logging functions. It
-    doesn't display the messages logged by them immediately however but
-    accumulates all messages logged during an event handler execution and then
-    shows them all at once when its Flush() method is called during the idle
-    time processing. This has the important advantage of showing only a single
-    dialog to the user even if several messages were logged because of a single
-    error as it often happens (e.g. a low level function could log a message
-    because it failed to open a file resulting in its caller logging another
-    message due to the failure of higher level operation requiring the use of
-    this file). If you need to force the display of all previously logged
-    messages immediately you can use wxLog::FlushActive() to force the dialog
-    display.
+        (Almost) for internal use only: it is supposed to be called by the
+        application shutdown code (where you don't want the log target to be
+        automatically created anymore).

 
 

-    Also notice that if an error message is logged when several informative
-    messages had been already logged before, the informative messages are
-    discarded on the assumption that they are not useful -- and may be
-    confusing and hence harmful -- any more after the error. The warning
-    and error messages are never discarded however and any informational
-    messages logged after the first error one are also kept (as they may
-    contain information about the error recovery). You may override DoLog()
-    method to change this behaviour.
+        Note that this function also calls ClearTraceMasks().
+    */
+    static void DontCreateOnDemand();

 
 

-    At any rate, it is possible that that several messages were accumulated
-    before this class Flush() method is called. If this is the case, Flush()
-    uses a custom dialog which shows the last message directly and allows the
-    user to view the previously logged ones by expanding the "Details"
-    wxCollapsiblePane inside it. This custom dialog also provides the buttons
-    for copying the log messages to the clipboard and saving them to a file.
+    /**
+        Returns the pointer to the active log target (may be @NULL).

 
 

-    However if only a single message is present when Flush() is called, just a
-    wxMessageBox() is used to show it. This has the advantage of being closer
-    to the native behaviour but it doesn't give the user any possibility to
-    copy or save the message (except for the recent Windows versions where @c
-    Ctrl-C may be pressed in the message box to copy its contents to the
-    clipboard) so you may want to override DoShowSingleMessage() to customize
-    wxLogGui -- the dialogs sample shows how to do this.
+        Notice that if SetActiveTarget() hadn't been previously explicitly
+        called, this function will by default try to create a log target by
+        calling wxAppTraits::CreateLogTarget() which may be overridden in a
+        user-defined traits class to change the default behaviour. You may also
+        call DontCreateOnDemand() to disable this behaviour.
+
+        When this function is called from threads other than main one,
+        auto-creation doesn't happen. But if the thread has a thread-specific
+        log target previously set by SetThreadActiveTarget(), it is returned
+        instead of the global one. Otherwise, the global log target is
+        returned.
+    */
+    static wxLog* GetActiveTarget();

 
 

-    @library{wxcore}
-    @category{logging}
-*/
-class wxLogGui : public wxLog
-{
-public:

     /**
     /**

-        Default constructor.
+        Sets the specified log target as the active one.
+
+        Returns the pointer to the previous active log target (may be @NULL).
+        To suppress logging use a new instance of wxLogNull not @NULL.  If the
+        active log target is set to @NULL a new default log target will be
+        created when logging occurs.
+
+        @see SetThreadActiveTarget()

     */
     */

-    wxLogGui();
+    static wxLog* SetActiveTarget(wxLog* logtarget);

 
     /**
 
     /**

-        Presents the accumulated log messages, if any, to the user.
+        Sets a thread-specific log target.

 
 

-        This method is called during the idle time and should show any messages
-        accumulated in wxLogGui#m_aMessages field to the user.
-     */
-    virtual void Flush();
+        The log target passed to this function will be used for all messages
+        logged by the current thread using the usual wxLog functions. This
+        shouldn't be called from the main thread which never uses a thread-
+        specific log target but can be used for the other threads to handle
+        thread logging completely separately; instead of buffering thread log
+        messages in the main thread logger.

 
 

-protected:
-    /**
-        Returns the appropriate title for the dialog.
+        Notice that unlike for SetActiveTarget(), wxWidgets does not destroy
+        the thread-specific log targets when the thread terminates so doing
+        this is your responsibility.

 
 

-        The title is constructed from wxApp::GetAppDisplayName() and the
-        severity string (e.g. "error" or "warning") appropriate for the current
-        wxLogGui#m_bErrors and wxLogGui#m_bWarnings values.
-     */
-    wxString GetTitle() const;
+        This method is only available if @c wxUSE_THREADS is 1, i.e. wxWidgets
+        was compiled with threads support.

 
 

-    /**
-        Returns wxICON_ERROR, wxICON_WARNING or wxICON_INFORMATION depending on
-        the current maximal severity.
+        @param logger
+            The new thread-specific log target, possibly @NULL.
+        @return
+            The previous thread-specific log target, initially @NULL.

 
 

-        This value is suitable to be used in the style parameter of
-        wxMessageBox() function.
+        @since 2.9.1

      */
      */

-    int GetSeverityIcon() const;
+    static wxLog *SetThreadActiveTarget(wxLog *logger);

 
     /**
 
     /**

-        Forgets all the currently stored messages.
-
-        If you override Flush() (and don't call the base class version), you
-        must call this method to avoid messages being logged over and over
-        again.
-     */
-    void Clear();
+        Flushes the current log target if any, does nothing if there is none.

 
 

+        When this method is called from the main thread context, it also
+        flushes any previously buffered messages logged by the other threads.
+        When it is called from the other threads it simply calls Flush() on the
+        currently active log target, so it mostly makes sense to do this if a
+        thread has its own logger set with SetThreadActiveTarget().
+    */
+    static void FlushActive();

 
     /**
 
     /**

-        Method called by Flush() to show a single log message.
-
-        This function can be overridden to show the message in a different way.
-        By default a simple wxMessageBox() call is used.
-
-        @param message
-            The message to show (it can contain multiple lines).
-        @param title
-            The suggested title for the dialog showing the message, see
-            GetTitle().
-        @param style
-            One of @c wxICON_XXX constants, see GetSeverityIcon().
-     */
-    virtual void DoShowSingleLogMessage(const wxString& message,
-                                        const wxString& title,
-                                        int style);
+        Resumes logging previously suspended by a call to Suspend().
+        All messages logged in the meanwhile will be flushed soon.
+    */
+    static void Resume();

 
     /**
 
     /**

-        Method called by Flush() to show multiple log messages.
+        Suspends the logging until Resume() is called.

 
 

-        This function can be overridden to show the messages in a different way.
-        By default a special log dialog showing the most recent message and
-        allowing the user to expand it to view the previously logged ones is
-        used.
+        Note that the latter must be called the same number of times as the former
+        to undo it, i.e. if you call Suspend() twice you must call Resume() twice as well.

 
 

-        @param messages
-            Array of messages to show; it contains more than one element.
-        @param severities
-            Array of message severities containing @c wxLOG_XXX values.
-        @param times
-            Array of time_t values indicating when each message was logged.
-        @param title
-            The suggested title for the dialog showing the message, see
-            GetTitle().
-        @param style
-            One of @c wxICON_XXX constants, see GetSeverityIcon().
-     */
-    virtual void DoShowMultipleLogMessages(const wxArrayString& messages,
-                                           const wxArrayInt& severities,
-                                           const wxArrayLong& times,
-                                           const wxString& title,
-                                           int style);
+        Note that suspending the logging means that the log sink won't be flushed
+        periodically, it doesn't have any effect if the current log target does the
+        logging immediately without waiting for Flush() to be called (the standard
+        GUI log target only shows the log dialog when it is flushed, so Suspend()
+        works as expected with it).

 
 

+        @see Resume(), wxLogNull
+    */
+    static void Suspend();

 
 

-    /**
-        All currently accumulated messages.
+    //@}

 
 

-        This array may be empty if no messages were logged.

 
 

-        @see m_aSeverity, m_aTimes
-     */
-    wxArrayString m_aMessages;

 
     /**
 
     /**

-        The severities of each logged message.
-
-        This array is synchronized with wxLogGui#m_aMessages, i.e. the n-th
-        element of this array corresponds to the severity of the n-th message.
-        The possible severity values are @c wxLOG_XXX constants, e.g.
-        wxLOG_Error, wxLOG_Warning, wxLOG_Message etc.
-     */
-    wxArrayInt m_aSeverity;
+        @name Log level functions
+    */
+    //@{

 
     /**
 
     /**

-        The time stamps of each logged message.
+        Returns the current log level limit.

 
 

-        The elements of this array are time_t values corresponding to the time
-        when the message was logged.
-     */
-    wxArrayLong m_aTimes;
+        All messages at levels strictly greater than the value returned by this
+        function are not logged at all.

 
 

-    /**
-        True if there any error messages.
-     */
-    bool m_bErrors;
+        @see SetLogLevel(), IsLevelEnabled()
+    */
+    static wxLogLevel GetLogLevel();

 
     /**
 
     /**

-        True if there any warning messages.
+        Returns true if logging at this level is enabled for the current thread.

 
 

-        If both wxLogGui#m_bErrors and this member are false, there are only
-        informational messages to be shown.
-     */
-    bool m_bWarnings;
+        This function only returns @true if logging is globally enabled and if
+        @a level is less than or equal to the maximal log level enabled for the
+        given @a component.

 
 

-    /**
-        True if there any messages to be shown to the user.
+        @see IsEnabled(), SetLogLevel(), GetLogLevel(), SetComponentLevel()

 
 

-        This variable is used instead of simply checking whether
-        wxLogGui#m_aMessages array is empty to allow blocking further calls to
-        Flush() while a log dialog is already being shown, even if the messages
-        array hasn't been emptied yet.
+        @since 2.9.1

      */
      */

-    bool m_bHasMessages;
-};
-
+    static bool IsLevelEnabled(wxLogLevel level, wxString component);

 
 

+    /**
+        Sets the log level for the given component.

 
 

-/**
-    @class wxLogStream
+        For example, to disable all but error messages from wxWidgets network
+        classes you may use
+        @code
+            wxLog::SetComponentLevel("wx/net", wxLOG_Error);
+        @endcode

 
 

-    This class can be used to redirect the log messages to a C++ stream.
+        SetLogLevel() may be used to set the global log level.

 
 

-    Please note that this class is only available if wxWidgets was compiled with
-    the standard iostream library support (@c wxUSE_STD_IOSTREAM must be on).
+        @param component
+            Non-empty component name, possibly using slashes (@c /) to separate
+            it into several parts.
+        @param level
+            Maximal level of log messages from this component which will be
+            handled instead of being simply discarded.

 
 

-    @library{wxbase}
-    @category{logging}
+        @since 2.9.1
+     */
+    static void SetComponentLevel(const wxString& component, wxLogLevel level);

 
 

-    @see wxLogStderr, wxStreamToTextRedirector
-*/
-class wxLogStream : public wxLog
-{
-public:

     /**
     /**

-        Constructs a log target which sends all the log messages to the given
-        output stream. If it is @NULL, the messages are sent to @c cerr.
-    */
-    wxLogStream(std::ostream *ostr = NULL);
-};
-
-
+        Specifies that log messages with level greater (numerically) than
+        @a logLevel should be ignored and not sent to the active log target.

 
 

-/**
-    @class wxLogStderr
+        @see SetComponentLevel()
+    */
+    static void SetLogLevel(wxLogLevel logLevel);

 
 

-    This class can be used to redirect the log messages to a C file stream (not to
-    be confused with C++ streams).
+    //@}

 
 

-    It is the default log target for the non-GUI wxWidgets applications which
-    send all the output to @c stderr.

 
 

-    @library{wxbase}
-    @category{logging}

 
 

-    @see wxLogStream
-*/
-class wxLogStderr : public wxLog
-{
-public:

     /**
     /**

-        Constructs a log target which sends all the log messages to the given
-        @c FILE. If it is @NULL, the messages are sent to @c stderr.
+        @name Enable/disable features functions

     */
     */

-    wxLogStderr(FILE* fp = NULL);
-};
+    //@{

 
 

+    /**
+        Globally enable or disable logging.

 
 

+        Calling this function with @false argument disables all log messages
+        for the current thread.

 
 

-/**
-    @class wxLogBuffer
+        @see wxLogNull, IsEnabled()

 
 

-    wxLogBuffer is a very simple implementation of log sink which simply collects
-    all the logged messages in a string (except the debug messages which are output
-    in the usual way immediately as we're presumably not interested in collecting
-    them for later). The messages from different log function calls are separated
-    by the new lines.
+        @return
+            The old state, i.e. @true if logging was previously enabled and
+            @false if it was disabled.
+     */
+    static bool EnableLogging(bool enable = true);

 
 

-    All the messages collected so far can be shown to the user (and the current
-    buffer cleared) by calling the overloaded wxLogBuffer::Flush method.
+    /**
+        Returns true if logging is enabled at all now.
+
+        @see IsLevelEnabled(), EnableLogging()
+     */
+    static bool IsEnabled();

 
 

-    @library{wxbase}
-    @category{logging}
-*/
-class wxLogBuffer : public wxLog
-{
-public:

     /**
     /**

-        The default ctor does nothing.
+        Returns whether the repetition counting mode is enabled.

     */
     */

-    wxLogBuffer();
+    static bool GetRepetitionCounting();

 
     /**
 
     /**

-        Shows all the messages collected so far to the user (using a message box in the
-        GUI applications or by printing them out to the console in text mode) and
-        clears the internal buffer.
+        Enables logging mode in which a log message is logged once, and in case exactly
+        the same message successively repeats one or more times, only the number of
+        repetitions is logged.

     */
     */

-    virtual void Flush();
+    static void SetRepetitionCounting(bool repetCounting = true);

 
     /**
 
     /**

-        Returns the current buffer contains. Messages from different log function calls
-        are separated with the new lines in the buffer.
-        The buffer can be cleared by Flush() which will also show the current
-        contents to the user.
-    */
-    const wxString& GetBuffer() const;
-};
+        Returns the current timestamp format string.

 
 

+        Notice that the current time stamp is only used by the default log
+        formatter and custom formatters may ignore this format.
+    */
+    static const wxString& GetTimestamp();

 
 

+    /**
+        Sets the timestamp format prepended by the default log targets to all
+        messages. The string may contain any normal characters as well as %
+        prefixed format specifiers, see @e strftime() manual for details.
+        Passing an empty string to this function disables message time stamping.

 
 

-/**
-    @class wxLogInterposer
+        Notice that the current time stamp is only used by the default log
+        formatter and custom formatters may ignore this format. You can also
+        define a custom wxLogFormatter to customize the time stamp handling
+        beyond changing its format.
+    */
+    static void SetTimestamp(const wxString& format);

 
 

-    A special version of wxLogChain which uses itself as the new log target.
-    It forwards log messages to the previously installed one in addition to
-    processing them itself.
+    /**
+        Disables time stamping of the log messages.

 
 

-    Unlike wxLogChain which is usually used directly as is, this class must be
-    derived from to implement wxLog::DoLog and/or wxLog::DoLogString methods.
+        Notice that the current time stamp is only used by the default log
+        formatter and custom formatters may ignore calls to this function.

 
 

-    wxLogInterposer destroys the previous log target in its destructor.
-    If you don't want this to happen, use wxLogInterposerTemp instead.
+        @since 2.9.0
+    */
+    static void DisableTimestamp();

 
 

-    @library{wxbase}
-    @category{logging}
-*/
-class wxLogInterposer : public wxLogChain
-{
-public:

     /**
     /**

-        The default constructor installs this object as the current active log target.
+        Returns whether the verbose mode is currently active.

     */
     */

-    wxLogInterposer();
-};
-
-
-
-/**
-    @class wxLogTextCtrl
+    static bool GetVerbose();

 
 

-    Using these target all the log messages can be redirected to a text control.
-    The text control must have been created with @c wxTE_MULTILINE style by the
-    caller previously.
+    /**
+        Activates or deactivates verbose mode in which the verbose messages are
+        logged as the normal ones instead of being silently dropped.

 
 

-    @library{wxbase}
-    @category{logging}
+        The verbose messages are the trace messages which are not disabled in the
+        release mode and are generated by wxLogVerbose().

 
 

-    @see wxTextCtrl, wxStreamToTextRedirector
-*/
-class wxLogTextCtrl : public wxLog
-{
-public:
-    /**
-        Constructs a log target which sends all the log messages to the given text
-        control. The @a textctrl parameter cannot be @NULL.
+        @see @ref overview_log

     */
     */

-    wxLogTextCtrl(wxTextCtrl* pTextCtrl);
-};
+    static void SetVerbose(bool verbose = true);

 
 

+    //@}

 
 
 
 

-/**
-    @class wxLog
+    /**
+        Sets the specified formatter as the active one.

 
 

-    wxLog class defines the interface for the @e log targets used by wxWidgets
-    logging functions as explained in the @ref overview_log.
-    The only situations when you need to directly use this class is when you want
-    to derive your own log target because the existing ones don't satisfy your
-    needs. Another case is if you wish to customize the behaviour of the standard
-    logging classes (all of which respect the wxLog settings): for example, set
-    which trace messages are logged and which are not or change (or even remove
-    completely) the timestamp on the messages.
+        @param formatter
+            The new formatter. If @NULL, reset to the default formatter.

 
 

-    Otherwise, it is completely hidden behind the @e wxLogXXX() functions and
-    you may not even know about its existence.
+        Returns the pointer to the previous formatter. You must delete it
+        if you don't plan to attach it again to a wxLog object later.

 
 

-    @note For console-mode applications, the default target is wxLogStderr, so
-          that all @e wxLogXXX() functions print on @c stderr when @c wxUSE_GUI = 0.
+        @since 2.9.4
+    */
+    wxLogFormatter *SetFormatter(wxLogFormatter* formatter);

 
 
 
 

-    @section log_derivingyours Deriving your own log target
+    /**
+        Some of wxLog implementations, most notably the standard wxLogGui class,
+        buffer the messages (for example, to avoid showing the user a zillion of modal
+        message boxes one after another -- which would be really annoying).
+        This function shows them all and clears the buffer contents.
+        If the buffer is already empty, nothing happens.

 
 

-    There are two functions which must be implemented by any derived class to
-    actually process the log messages: DoLog() and DoLogString().
-    The second function receives a string which just has to be output in some way
-    and the easiest way to write a new log target is to override just this function
-    in the derived class.
+        If you override this method in a derived class, call the base class
+        version first, before doing anything else.
+    */
+    virtual void Flush();

 
 

-    If more control over the output format is needed, then the first function must
-    be overridden which allows to construct custom messages depending on the log level
-    or even do completely different things depending on the message severity
-    (for example, throw away all messages except warnings and errors, show warnings
-    on the screen and forward the error messages to the user's (or programmer's) cell
-    phone - maybe depending on whether the timestamp tells us if it is day or
-    night in the current time zone).
+    /**
+        Log the given record.

 
 

-    There also functions to support message buffering. Why are they needed?
-    Some of wxLog implementations, most notably the standard wxLogGui class,
-    buffer the messages (for example, to avoid showing the user a zillion of modal
-    message boxes one after another -- which would be really annoying).
+        This function should only be called from the DoLog() implementations in
+        the derived classes if they need to call DoLogRecord() on another log
+        object (they can, of course, just use wxLog::DoLogRecord() call syntax
+        to call it on the object itself). It should not be used for logging new
+        messages which can be only sent to the currently active logger using
+        OnLog() which also checks if the logging (for this level) is enabled
+        while this method just directly calls DoLog().
+
+        Example of use of this class from wxLogChain:
+        @code
+        void wxLogChain::DoLogRecord(wxLogLevel level,
+                                     const wxString& msg,
+                                     const wxLogRecordInfo& info)
+        {
+            // let the previous logger show it
+            if ( m_logOld && IsPassingMessages() )
+                m_logOld->LogRecord(level, msg, info);

 
 

-    Flush() shows them all and clears the buffer contents.
-    This function doesn't do anything if the buffer is already empty.
+            // and also send it to the new one
+            if ( m_logNew && m_logNew != this )
+                m_logNew->LogRecord(level, msg, info);
+        }
+        @endcode

 
 

-    See also:
-    @li Flush()
-    @li FlushActive()
+        @since 2.9.1
+     */
+    void LogRecord(wxLogLevel level, const wxString& msg, const wxLogRecordInfo& info);
+
+protected:
+    /**
+        @name Logging callbacks.
+
+        The functions which should be overridden by custom log targets.

 
 

+        When defining a new log target, you have a choice between overriding
+        DoLogRecord(), which provides maximal flexibility, DoLogTextAtLevel()
+        which can be used if you don't intend to change the default log
+        messages formatting but want to handle log messages of different levels
+        differently or, in the simplest case, DoLogText().
+     */
+    //@{

 
 

-    @section log_tracemasks Using trace masks
+    /**
+        Called to log a new record.

 
 

-    The functions below allow some limited customization of wxLog behaviour
-    without writing a new log target class (which, aside from being a matter of
-    several minutes, allows you to do anything you want).
-    The verbose messages are the trace messages which are not disabled in the
-    release mode and are generated by wxLogVerbose().
-    They are not normally shown to the user because they present little interest,
-    but may be activated, for example, in order to help the user find some program
-    problem.
+        Any log message created by wxLogXXX() functions is passed to this
+        method of the active log target. The default implementation prepends
+        the timestamp and, for some log levels (e.g. error and warning), the
+        corresponding prefix to @a msg and passes it to DoLogTextAtLevel().

 
 

-    As for the (real) trace messages, their handling depends on the currently
-    enabled trace masks: if AddTraceMask() was called for the mask of the given
-    message, it will be logged, otherwise nothing happens.
+        You may override this method to implement custom formatting of the
+        log messages or to implement custom filtering of log messages (e.g. you
+        could discard all log messages coming from the given source file).
+     */
+    virtual void DoLogRecord(wxLogLevel level,
+                             const wxString& msg,
+                             const wxLogRecordInfo& info);

 
 

-    For example,
-    @code
-    wxLogTrace( wxTRACE_OleCalls, "IFoo::Bar() called" );
-    @endcode
+    /**
+        Called to log the specified string at given level.

 
 

-    will log the message if it was preceded by:
+        The base class versions logs debug and trace messages on the system
+        default debug output channel and passes all the other messages to
+        DoLogText().
+    */
+    virtual void DoLogTextAtLevel(wxLogLevel level, const wxString& msg);
+
+    /**
+        Called to log the specified string.
+
+        A simple implementation might just send the string to @c stdout or
+        @c stderr or save it in a file (of course, the already existing
+        wxLogStderr can be used for this).
+
+        The base class version of this function asserts so it must be
+        overridden if you don't override DoLogRecord() or DoLogTextAtLevel().
+    */
+    virtual void DoLogText(const wxString& msg);
+
+    //@}
+};
+
+
+
+/**
+    @class wxLogChain
+
+    This simple class allows you to chain log sinks, that is to install a new sink but
+    keep passing log messages to the old one instead of replacing it completely as
+    wxLog::SetActiveTarget does.
+
+    It is especially useful when you want to divert the logs somewhere (for
+    example to a file or a log window) but also keep showing the error messages
+    using the standard dialogs as wxLogGui does by default.
+
+    Example of usage:

 
     @code
 
     @code

-    wxLog::AddTraceMask( wxTRACE_OleCalls);
-    @endcode
+    wxLogChain *logChain = new wxLogChain(new wxLogStderr);

 
 

-    The standard trace masks are given in wxLogTrace() documentation.
-
-    Finally, the @e wxLog::DoLog() function automatically prepends a time stamp
-    to all the messages. The format of the time stamp may be changed: it can be
-    any string with % specifications fully described in the documentation of the
-    standard @e strftime() function. For example, the default format is
-    "[%d/%b/%y %H:%M:%S] " which gives something like "[17/Sep/98 22:10:16] "
-    (without quotes) for the current date. Setting an empty string as the time
-    format or calling the shortcut wxLog::DisableTimestamp(), disables timestamping
-    of the messages completely.
-
-    See also
-    @li AddTraceMask()
-    @li RemoveTraceMask()
-    @li ClearTraceMasks()
-    @li GetTraceMasks()
-    @li IsAllowedTraceMask()
-    @li SetVerbose()
-    @li GetVerbose()
-    @li SetTimestamp()
-    @li GetTimestamp()
-    @li SetTraceMask()
-    @li GetTraceMask()
-    @li SetRepetitionCounting()
-    @li GetRepetitionCounting()
-
-    @note
-    Timestamping is disabled for Visual C++ users in debug builds by
-    default because otherwise it would be impossible to directly go to the line
-    from which the log message was generated by simply clicking in the debugger
-    window on the corresponding error message. If you wish to enable it, please
-    use SetTimestamp() explicitly.
-
-
-    @section log_target Manipulating the log target
-
-    The functions in this section work with and manipulate the active log
-    target.
-
-    Get/Set methods are used to install/query the current active target and,
-    finally, DontCreateOnDemand() disables the automatic creation of a standard
-    log target if none actually exists. It is only useful when the application
-    is terminating and shouldn't be used in other situations because it may
-    easily lead to a loss of messages.
-
-    See also:
-    @li GetActiveTarget()
-    @li SetActiveTarget()
-    @li DontCreateOnDemand()
-    @li Suspend()
-    @li Resume()
+    // all the log messages are sent to stderr and also processed as usually
+    ...

 
 

+    // don't delete logChain directly as this would leave a dangling
+    // pointer as active log target, use SetActiveTarget() instead
+    delete wxLog::SetActiveTarget(...something else or NULL...);
+    @endcode

 
 

-    @library{wxcore}
+    @library{wxbase}

     @category{logging}
     @category{logging}

-
-    @see @ref overview_log

 */
 */

-class wxLog
+class wxLogChain : public wxLog

 {
 public:
     /**
 {
 public:
     /**

-        Add the @a mask to the list of allowed masks for wxLogTrace().
-
-        @see RemoveTraceMask(), GetTraceMasks()
+        Sets the specified @c logger (which may be @NULL) as the default log
+        target but the log messages are also passed to the previous log target if any.

     */
     */

-    static void AddTraceMask(const wxString& mask);
+    wxLogChain(wxLog* logger);

 
     /**
 
     /**

-        Removes all trace masks previously set with AddTraceMask().
-
-        @see RemoveTraceMask()
+        Destroys the previous log target.

     */
     */

-    static void ClearTraceMasks();
+    virtual ~wxLogChain();

 
     /**
 
     /**

-        Instructs wxLog to not create new log targets on the fly if there is none
-        currently. (Almost) for internal use only: it is supposed to be called by the
-        application shutdown code.
-
-        Note that this function also calls ClearTraceMasks().
+        Detaches the old log target so it won't be destroyed when the wxLogChain object
+        is destroyed.

     */
     */

-    static void DontCreateOnDemand();
+    void DetachOldLog();

 
     /**
 
     /**

-        Shows all the messages currently in buffer and clears it.
-        If the buffer is already empty, nothing happens.
+        Returns the pointer to the previously active log target (which may be @NULL).

     */
     */

-    virtual void Flush();
+    wxLog* GetOldLog() const;

 
     /**
 
     /**

-        Flushes the current log target if any, does nothing if there is none.
-
-        @see Flush()
+        Returns @true if the messages are passed to the previously active log
+        target (default) or @false if PassMessages() had been called.

     */
     */

-    static void FlushActive();
+    bool IsPassingMessages() const;

 
     /**
 
     /**

-        Returns the pointer to the active log target (may be @NULL).
+        By default, the log messages are passed to the previously active log target.
+        Calling this function with @false parameter disables this behaviour
+        (presumably temporarily, as you shouldn't use wxLogChain at all otherwise) and
+        it can be reenabled by calling it again with @a passMessages set to @true.

     */
     */

-    static wxLog* GetActiveTarget();
+    void PassMessages(bool passMessages);

 
     /**
 
     /**

-        Returns the current log level limit.
+        Sets another log target to use (may be @NULL).
+
+        The log target specified in the wxLogChain(wxLog*) constructor or in a
+        previous call to this function is deleted.
+        This doesn't change the old log target value (the one the messages are
+        forwarded to) which still remains the same as was active when wxLogChain
+        object was created.

     */
     */

-    static wxLogLevel GetLogLevel();
+    void SetLog(wxLog* logger);
+};
+
+
+
+/**
+    @class wxLogInterposer
+
+    A special version of wxLogChain which uses itself as the new log target.
+    It forwards log messages to the previously installed one in addition to
+    processing them itself.
+
+    Unlike wxLogChain which is usually used directly as is, this class must be
+    derived from to implement wxLog::DoLog and/or wxLog::DoLogString methods.
+
+    wxLogInterposer destroys the previous log target in its destructor.
+    If you don't want this to happen, use wxLogInterposerTemp instead.

 
 

+    @library{wxbase}
+    @category{logging}
+*/
+class wxLogInterposer : public wxLogChain
+{
+public:

     /**
     /**

-        Returns whether the repetition counting mode is enabled.
+        The default constructor installs this object as the current active log target.

     */
     */

-    static bool GetRepetitionCounting();
+    wxLogInterposer();
+};

 
 

+
+
+/**
+    @class wxLogInterposerTemp
+
+    A special version of wxLogChain which uses itself as the new log target.
+    It forwards log messages to the previously installed one in addition to
+    processing them itself. Unlike wxLogInterposer, it doesn't delete the old
+    target which means it can be used to temporarily redirect log output.
+
+    As per wxLogInterposer, this class must be derived from to implement
+    wxLog::DoLog and/or wxLog::DoLogString methods.
+
+    @library{wxbase}
+    @category{logging}
+*/
+class wxLogInterposerTemp : public wxLogChain
+{
+public:

     /**
     /**

-        Returns the current timestamp format string.
+        The default constructor installs this object as the current active log target.

     */
     */

-    static const wxString& GetTimestamp();
+    wxLogInterposerTemp();
+};
+
+
+/**
+    @class wxLogStream
+
+    This class can be used to redirect the log messages to a C++ stream.
+
+    Please note that this class is only available if wxWidgets was compiled with
+    the standard iostream library support (@c wxUSE_STD_IOSTREAM must be on).

 
 

+    @library{wxbase}
+    @category{logging}
+
+    @see wxLogStderr, wxStreamToTextRedirector
+*/
+class wxLogStream : public wxLog
+{
+public:

     /**
     /**

-        @deprecated
-        Returns the current trace mask, see Customization() section for details.
+        Constructs a log target which sends all the log messages to the given
+        output stream. If it is @NULL, the messages are sent to @c cerr.

     */
     */

-    static wxTraceMask GetTraceMask();
+    wxLogStream(std::ostream *ostr = NULL);
+};

 
 

-    /**
-        Returns the currently allowed list of string trace masks.

 
 

-        @see AddTraceMask().
-    */
-    static const wxArrayString& GetTraceMasks();

 
 

+/**
+    @class wxLogStderr
+
+    This class can be used to redirect the log messages to a C file stream (not to
+    be confused with C++ streams).
+
+    It is the default log target for the non-GUI wxWidgets applications which
+    send all the output to @c stderr.
+
+    @library{wxbase}
+    @category{logging}
+
+    @see wxLogStream
+*/
+class wxLogStderr : public wxLog
+{
+public:

     /**
     /**

-        Returns whether the verbose mode is currently active.
+        Constructs a log target which sends all the log messages to the given
+        @c FILE. If it is @NULL, the messages are sent to @c stderr.

     */
     */

-    static bool GetVerbose();
+    wxLogStderr(FILE* fp = NULL);
+};

 
 

-    /**
-        Returns @true if the @a mask is one of allowed masks for wxLogTrace().

 
 

-        See also: AddTraceMask(), RemoveTraceMask()
-    */
-    static bool IsAllowedTraceMask(const wxString& mask);

 
 

-    /**
-        Remove the @a mask from the list of allowed masks for
-        wxLogTrace().
+/**
+    @class wxLogBuffer

 
 

-        @see AddTraceMask()
+    wxLogBuffer is a very simple implementation of log sink which simply collects
+    all the logged messages in a string (except the debug messages which are output
+    in the usual way immediately as we're presumably not interested in collecting
+    them for later). The messages from different log function calls are separated
+    by the new lines.
+
+    All the messages collected so far can be shown to the user (and the current
+    buffer cleared) by calling the overloaded wxLogBuffer::Flush method.
+
+    @library{wxbase}
+    @category{logging}
+*/
+class wxLogBuffer : public wxLog
+{
+public:
+    /**
+        The default ctor does nothing.

     */
     */

-    static void RemoveTraceMask(const wxString& mask);
+    wxLogBuffer();

 
     /**
 
     /**

-        Resumes logging previously suspended by a call to Suspend().
-        All messages logged in the meanwhile will be flushed soon.
+        Shows all the messages collected so far to the user (using a message box in the
+        GUI applications or by printing them out to the console in text mode) and
+        clears the internal buffer.

     */
     */

-    static void Resume();
+    virtual void Flush();

 
     /**
 
     /**

-        Sets the specified log target as the active one.
+        Returns the current buffer contains. Messages from different log function calls
+        are separated with the new lines in the buffer.
+        The buffer can be cleared by Flush() which will also show the current
+        contents to the user.
+    */
+    const wxString& GetBuffer() const;
+};

 
 

-        Returns the pointer to the previous active log target (may be @NULL).
-        To suppress logging use a new instance of wxLogNull not @NULL.  If the
-        active log target is set to @NULL a new default log target will be
-        created when logging occurs.
+
+
+/**
+    @class wxLogNull
+
+    This class allows you to temporarily suspend logging. All calls to the log
+    functions during the life time of an object of this class are just ignored.
+
+    In particular, it can be used to suppress the log messages given by wxWidgets
+    itself but it should be noted that it is rarely the best way to cope with this
+    problem as @b all log messages are suppressed, even if they indicate a
+    completely different error than the one the programmer wanted to suppress.
+
+    For instance, the example of the overview:
+
+    @code
+      wxFile file;
+
+      // wxFile.Open() normally complains if file can't be opened, we don't want it
+      {
+        wxLogNull logNo;
+        if ( !file.Open("bar") )
+          ... process error ourselves ...
+      } // ~wxLogNull called, old log sink restored
+
+      wxLogMessage("..."); // ok
+    @endcode
+
+    would be better written as:
+
+    @code
+      wxFile file;
+
+      // don't try to open file if it doesn't exist, we are prepared to deal with
+      // this ourselves - but all other errors are not expected
+      if ( wxFile::Exists("bar") )
+      {
+          // gives an error message if the file couldn't be opened
+          file.Open("bar");
+      }
+      else
+      {
+          ...
+      }
+    @endcode
+
+
+    @library{wxbase}
+    @category{logging}
+*/
+class wxLogNull
+{
+public:
+    /**
+        Suspends logging.

     */
     */

-    static wxLog* SetActiveTarget(wxLog* logtarget);
+    wxLogNull();

 
     /**
 
     /**

-        Specifies that log messages with level greater (numerically) than
-        @a logLevel should be ignored and not sent to the active log target.
+        Resumes logging.

     */
     */

-    static void SetLogLevel(wxLogLevel logLevel);
+    ~wxLogNull();
+};
+
+#endif // wxUSE_BASE
+
+#if wxUSE_GUI
+
+/**
+    @class wxLogWindow
+
+    This class represents a background log window: to be precise, it collects all
+    log messages in the log frame which it manages but also passes them on to the
+    log target which was active at the moment of its creation. This allows you, for
+    example, to show all the log messages in a frame but still continue to process
+    them normally by showing the standard log dialog.

 
 

+    @library{wxcore}
+    @category{logging}
+
+    @see wxLogTextCtrl
+*/
+class wxLogWindow : public wxLogInterposer
+{
+public:

     /**
     /**

-        Enables logging mode in which a log message is logged once, and in case exactly
-        the same message successively repeats one or more times, only the number of
-        repetitions is logged.
+        Creates the log frame window and starts collecting the messages in it.
+
+        @param pParent
+            The parent window for the log frame, may be @NULL
+        @param szTitle
+            The title for the log frame
+        @param show
+            @true to show the frame initially (default), otherwise
+            Show() must be called later.
+        @param passToOld
+            @true to process the log messages normally in addition to logging them
+            in the log frame (default), @false to only log them in the log frame.
+            Note that if no targets were set using wxLog::SetActiveTarget() then
+            wxLogWindow simply becomes the active one and messages won't be passed
+            to other targets.

     */
     */

-    static void SetRepetitionCounting(bool repetCounting = true);
+    wxLogWindow(wxWindow* pParent, const wxString& szTitle, bool show = true,
+                bool passToOld = true);

 
     /**
 
     /**

-        Sets the timestamp format prepended by the default log targets to all
-        messages. The string may contain any normal characters as well as %
-        prefixed format specificators, see @e strftime() manual for details.
-        Passing an empty string to this function disables message time stamping.
+        Returns the associated log frame window. This may be used to position or resize
+        it but use Show() to show or hide it.

     */
     */

-    static void SetTimestamp(const wxString& format);
+    wxFrame* GetFrame() const;

 
     /**
 
     /**

-        Disables time stamping of the log messages.
+        Called if the user closes the window interactively, will not be
+        called if it is destroyed for another reason (such as when program
+        exits).

 
 

-        @since 2.9.0
+        Return @true from here to allow the frame to close, @false to
+        prevent this from happening.
+
+        @see OnFrameDelete()

     */
     */

-    static void DisableTimestamp();
+    virtual bool OnFrameClose(wxFrame* frame);

 
     /**
 
     /**

-        @deprecated
-        Sets the trace mask, see @ref log_tracemasks section for details.
+        Called right before the log frame is going to be deleted: will
+        always be called unlike OnFrameClose().

     */
     */

-    static void SetTraceMask(wxTraceMask mask);
+    virtual void OnFrameDelete(wxFrame* frame);

 
     /**
 
     /**

-        Activates or deactivates verbose mode in which the verbose messages are
-        logged as the normal ones instead of being silently dropped.
+        Shows or hides the frame.

     */
     */

-    static void SetVerbose(bool verbose = true);
+    void Show(bool show = true);
+};

 
 

-    /**
-        Suspends the logging until Resume() is called.

 
 

-        Note that the latter must be called the same number of times as the former
-        to undo it, i.e. if you call Suspend() twice you must call Resume() twice as well.

 
 

-        Note that suspending the logging means that the log sink won't be be flushed
-        periodically, it doesn't have any effect if the current log target does the
-        logging immediately without waiting for Flush() to be called (the standard
-        GUI log target only shows the log dialog when it is flushed, so Suspend()
-        works as expected with it).
+/**
+    @class wxLogGui

 
 

-        @see Resume(), wxLogNull
-    */
-    static void Suspend();
+    This is the default log target for the GUI wxWidgets applications.
+
+    Please see @ref overview_log_customize for explanation of how to change the
+    default log target.
+
+    An object of this class is used by default to show the log messages created
+    by using wxLogMessage(), wxLogError() and other logging functions. It
+    doesn't display the messages logged by them immediately however but
+    accumulates all messages logged during an event handler execution and then
+    shows them all at once when its Flush() method is called during the idle
+    time processing. This has the important advantage of showing only a single
+    dialog to the user even if several messages were logged because of a single
+    error as it often happens (e.g. a low level function could log a message
+    because it failed to open a file resulting in its caller logging another
+    message due to the failure of higher level operation requiring the use of
+    this file). If you need to force the display of all previously logged
+    messages immediately you can use wxLog::FlushActive() to force the dialog
+    display.
+
+    Also notice that if an error message is logged when several informative
+    messages had been already logged before, the informative messages are
+    discarded on the assumption that they are not useful -- and may be
+    confusing and hence harmful -- any more after the error. The warning
+    and error messages are never discarded however and any informational
+    messages logged after the first error one are also kept (as they may
+    contain information about the error recovery). You may override DoLog()
+    method to change this behaviour.
+
+    At any rate, it is possible that that several messages were accumulated
+    before this class Flush() method is called. If this is the case, Flush()
+    uses a custom dialog which shows the last message directly and allows the
+    user to view the previously logged ones by expanding the "Details"
+    wxCollapsiblePane inside it. This custom dialog also provides the buttons
+    for copying the log messages to the clipboard and saving them to a file.
+
+    However if only a single message is present when Flush() is called, just a
+    wxMessageBox() is used to show it. This has the advantage of being closer
+    to the native behaviour but it doesn't give the user any possibility to
+    copy or save the message (except for the recent Windows versions where @c
+    Ctrl-C may be pressed in the message box to copy its contents to the
+    clipboard) so you may want to override DoShowSingleLogMessage() to
+    customize wxLogGui -- the dialogs sample shows how to do this.

 
 

+    @library{wxcore}
+    @category{logging}
+*/
+class wxLogGui : public wxLog
+{
+public:

     /**
     /**

-        Log the given record.
+        Default constructor.
+    */
+    wxLogGui();

 
 

-        This function should only be called from the DoLog() implementations in
-        the derived classes if they need to call DoLogRecord() on another log
-        object (they can, of course, just use wxLog::DoLogRecord() call syntax
-        to call it on the object itself). It should not be used for logging new
-        messages which can be only sent to the currently active logger using
-        OnLog() which also checks if the logging (for this level) is enabled
-        while this method just directly calls DoLog().
+    /**
+        Presents the accumulated log messages, if any, to the user.

 
 

-        Example of use of this class from wxLogChain:
-        @code
-        void wxLogChain::DoLogRecord(wxLogLevel level,
-                                     const wxString& msg,
-                                     const wxLogRecordInfo& info)
-        {
-            // let the previous logger show it
-            if ( m_logOld && IsPassingMessages() )
-                m_logOld->LogRecord(level, msg, info);
+        This method is called during the idle time and should show any messages
+        accumulated in wxLogGui#m_aMessages field to the user.
+     */
+    virtual void Flush();

 
 

-            // and also send it to the new one
-            if ( m_logNew && m_logNew != this )
-                m_logNew->LogRecord(level, msg, info);
-        }
-        @endcode
+protected:
+    /**
+        Returns the appropriate title for the dialog.

 
 

-        @since 2.9.1
+        The title is constructed from wxApp::GetAppDisplayName() and the
+        severity string (e.g. "error" or "warning") appropriate for the current
+        wxLogGui#m_bErrors and wxLogGui#m_bWarnings values.

      */
      */

-    void LogRecord(wxLogLevel level, const wxString& msg, time_t timestamp);
+    wxString GetTitle() const;

 
 

-protected:

     /**
     /**

-        @name Logging callbacks.
+        Returns wxICON_ERROR, wxICON_WARNING or wxICON_INFORMATION depending on
+        the current maximal severity.

 
 

-        The functions which should be overridden by custom log targets.
+        This value is suitable to be used in the style parameter of
+        wxMessageBox() function.
+     */
+    int GetSeverityIcon() const;

 
 

-        When defining a new log target, you have a choice between overriding
-        DoLogRecord(), which provides maximal flexibility, DoLogTextAtLevel()
-        which can be used if you don't intend to change the default log
-        messages formatting but want to handle log messages of different levels
-        differently or, in the simplest case, DoLogText().
+    /**
+        Forgets all the currently stored messages.
+
+        If you override Flush() (and don't call the base class version), you
+        must call this method to avoid messages being logged over and over
+        again.

      */
      */

-    //@{
+    void Clear();
+

 
     /**
 
     /**

-        Called to created log a new record.
+        All currently accumulated messages.

 
 

-        Any log message created by wxLogXXX() functions is passed to this
-        method of the active log target. The default implementation prepends
-        the timestamp and, for some log levels (e.g. error and warning), the
-        corresponding prefix to @a msg and passes it to DoLogTextAtLevel().
+        This array may be empty if no messages were logged.

 
 

-        You may override this method to implement custom formatting of the
-        log messages or to implement custom filtering of log messages (e.g. you
-        could discard all log messages coming from the given source file).
+        @see m_aSeverity, m_aTimes

      */
      */

-    virtual void DoLogRecord(wxLogLevel level,
-                             const wxString& msg,
-                             const wxLogRecordInfo& info);
+    wxArrayString m_aMessages;

 
     /**
 
     /**

-        Called to log the specified string at given level.
+        The severities of each logged message.

 
 

-        The base class versions logs debug and trace messages on the system
-        default debug output channel and passes all the other messages to
-        DoLogText().
-    */
-    virtual void DoLogTextAtLevel(wxLogLevel level, const wxString& msg);
+        This array is synchronized with wxLogGui#m_aMessages, i.e. the n-th
+        element of this array corresponds to the severity of the n-th message.
+        The possible severity values are @c wxLOG_XXX constants, e.g.
+        wxLOG_Error, wxLOG_Warning, wxLOG_Message etc.
+     */
+    wxArrayInt m_aSeverity;

 
     /**
 
     /**

-        Called to log the specified string.
+        The time stamps of each logged message.

 
 

-        A simple implementation might just send the string to @c stdout or
-        @c stderr or save it in a file (of course, the already existing
-        wxLogStderr can be used for this).
+        The elements of this array are time_t values corresponding to the time
+        when the message was logged.
+     */
+    wxArrayLong m_aTimes;

 
 

-        The base class version of this function asserts so it must be
-        overridden if you don't override DoLogRecord() or DoLogTextAtLevel().
-    */
-    virtual void DoLogText(const wxString& msg);
+    /**
+        True if there any error messages.
+     */
+    bool m_bErrors;

 
 

-    //@}
-};
+    /**
+        True if there any warning messages.

 
 

+        If both wxLogGui#m_bErrors and this member are false, there are only
+        informational messages to be shown.
+     */
+    bool m_bWarnings;

 
 

+    /**
+        True if there any messages to be shown to the user.

 
 

-/**
-    @class wxLogNull
+        This variable is used instead of simply checking whether
+        wxLogGui#m_aMessages array is empty to allow blocking further calls to
+        Flush() while a log dialog is already being shown, even if the messages
+        array hasn't been emptied yet.
+     */
+    bool m_bHasMessages;

 
 

-    This class allows you to temporarily suspend logging. All calls to the log
-    functions during the life time of an object of this class are just ignored.
+private:
+    /**
+        Method called by Flush() to show a single log message.

 
 

-    In particular, it can be used to suppress the log messages given by wxWidgets
-    itself but it should be noted that it is rarely the best way to cope with this
-    problem as @b all log messages are suppressed, even if they indicate a
-    completely different error than the one the programmer wanted to suppress.
+        This function can be overridden to show the message in a different way.
+        By default a simple wxMessageBox() call is used.

 
 

-    For instance, the example of the overview:
+        @param message
+            The message to show (it can contain multiple lines).
+        @param title
+            The suggested title for the dialog showing the message, see
+            GetTitle().
+        @param style
+            One of @c wxICON_XXX constants, see GetSeverityIcon().
+     */
+    virtual void DoShowSingleLogMessage(const wxString& message,
+                                        const wxString& title,
+                                        int style);

 
 

-    @code
-      wxFile file;
+    /**
+        Method called by Flush() to show multiple log messages.

 
 

-      // wxFile.Open() normally complains if file can't be opened, we don't want it
-      {
-        wxLogNull logNo;
-        if ( !file.Open("bar") )
-          ... process error ourselves ...
-      } // ~wxLogNull called, old log sink restored
+        This function can be overridden to show the messages in a different way.
+        By default a special log dialog showing the most recent message and
+        allowing the user to expand it to view the previously logged ones is
+        used.

 
 

-      wxLogMessage("..."); // ok
-    @endcode
+        @param messages
+            Array of messages to show; it contains more than one element.
+        @param severities
+            Array of message severities containing @c wxLOG_XXX values.
+        @param times
+            Array of time_t values indicating when each message was logged.
+        @param title
+            The suggested title for the dialog showing the message, see
+            GetTitle().
+        @param style
+            One of @c wxICON_XXX constants, see GetSeverityIcon().
+     */
+    virtual void DoShowMultipleLogMessages(const wxArrayString& messages,
+                                           const wxArrayInt& severities,
+                                           const wxArrayLong& times,
+                                           const wxString& title,
+                                           int style);
+};

 
 

-    would be better written as:

 
 

-    @code
-      wxFile file;

 
 

-      // don't try to open file if it doesn't exist, we are prepared to deal with
-      // this ourselves - but all other errors are not expected
-      if ( wxFile::Exists("bar") )
-      {
-          // gives an error message if the file couldn't be opened
-          file.Open("bar");
-      }
-      else
-      {
-          ...
-      }
-    @endcode
+/**
+    @class wxLogTextCtrl

 
 

+    Using these target all the log messages can be redirected to a text control.
+    The text control must have been created with @c wxTE_MULTILINE style by the
+    caller previously.

 
 

-    @library{wxbase}
+    @library{wxcore}

     @category{logging}
     @category{logging}

+
+    @see wxTextCtrl, wxStreamToTextRedirector

 */
 */

-class wxLogNull
+class wxLogTextCtrl : public wxLog

 {
 public:
     /**
 {
 public:
     /**

-        Suspends logging.
-    */
-    wxLogNull();
-
-    /**
-        Resumes logging.
+        Constructs a log target which sends all the log messages to the given text
+        control. The @a textctrl parameter cannot be @NULL.

     */
     */

-    ~wxLogNull();
+    wxLogTextCtrl(wxTextCtrl* pTextCtrl);

 };
 
 
 };
 
 

+#endif // wxUSE_GUI
+
+#if wxUSE_BASE
+

 
 // ============================================================================
 // Global functions/macros
 
 // ============================================================================
 // Global functions/macros


@@ -1063,6 +1233,18 @@ const wxChar* wxSysErrorMsg(unsigned long errCode = 0);
 
 //@}
 
 
 //@}
 

+/** @addtogroup group_funcmacro_log */
+//@{
+/**
+    Logs a message with the given wxLogLevel.
+    E.g. using @c wxLOG_Message as first argument, this function behaves like wxLogMessage().
+
+    @header{wx/log.h}
+*/
+void wxLogGeneric(wxLogLevel level, const char* formatString, ... );
+void wxVLogGeneric(wxLogLevel level, const char* formatString, va_list argPtr);
+//@}
+

 /** @addtogroup group_funcmacro_log */
 //@{
 /**
 /** @addtogroup group_funcmacro_log */
 //@{
 /**


@@ -1129,35 +1311,22 @@ void wxVLogError(const char* formatString, va_list argPtr);
 /** @addtogroup group_funcmacro_log */
 //@{
 /**
 /** @addtogroup group_funcmacro_log */
 //@{
 /**

-    Like wxLogDebug(), trace functions only do something in debug builds and
-    expand to nothing in the release one. The reason for making it a separate
-    function is that usually there are a lot of trace messages, so it might
-    make sense to separate them from other debug messages.
+    Log a message at @c wxLOG_Trace log level (see ::wxLogLevelValues enum).

 
 

-    wxLogTrace(const char*,const char*,...) and can be used instead of
-    wxLogDebug() if you would like to be able to separate trace messages into
-    different categories which can be enabled or disabled with
-    wxLog::AddTraceMask() and wxLog::RemoveTraceMask().
-
-    @header{wx/log.h}
-*/
-void wxLogTrace(const char *mask, const char* formatString, ... );
-void wxVLogTrace(const char *mask, const char* formatString, va_list argPtr);
-//@}
+    Notice that the use of trace masks is not recommended any more as setting
+    the log components (please see @ref overview_log_enable) provides a way to
+    do the same thing for log messages of any level, and not just the tracing
+    ones.

 
 

-/** @addtogroup group_funcmacro_log */
-//@{
-/**

     Like wxLogDebug(), trace functions only do something in debug builds and
     expand to nothing in the release one. The reason for making it a separate
     function is that usually there are a lot of trace messages, so it might
     make sense to separate them from other debug messages.
 
     Like wxLogDebug(), trace functions only do something in debug builds and
     expand to nothing in the release one. The reason for making it a separate
     function is that usually there are a lot of trace messages, so it might
     make sense to separate them from other debug messages.
 

-    In this version of wxLogTrace(), trace messages can be separated into
-    different categories and calls using this function only log the message if
-    the given @a mask is currently enabled in wxLog. This lets you selectively
-    trace only some operations and not others by enabling the desired trace
-    masks with wxLog::AddTraceMask() or by setting the
+    Trace messages can be separated into different categories; these functions in facts
+    only log the message if the given @a mask is currently enabled in wxLog. 
+    This lets you selectively trace only some operations and not others by enabling the 
+    desired trace masks with wxLog::AddTraceMask() or by setting the

     @ref overview_envvars "@c WXTRACE environment variable".
 
     The predefined string trace masks used by wxWidgets are:
     @ref overview_envvars "@c WXTRACE environment variable".
 
     The predefined string trace masks used by wxWidgets are:


@@ -1170,22 +1339,10 @@ void wxVLogTrace(const char *mask, const char* formatString, va_list argPtr);
     @itemdef{ wxTRACE_OleCalls, Trace OLE method calls (Win32 only) }
     @endDefList
 
     @itemdef{ wxTRACE_OleCalls, Trace OLE method calls (Win32 only) }
     @endDefList
 

-    @note Since both the mask and the format string are strings, this might
-          lead to function signature confusion in some cases: if you intend to
-          call the format string only version of wxLogTrace(), add a "%s"
-          format string parameter and then supply a second string parameter for
-          that "%s", the string mask version of wxLogTrace() will erroneously
-          get called instead, since you are supplying two string parameters to
-          the function. In this case you'll unfortunately have to avoid having
-          two leading string parameters, e.g. by adding a bogus integer (with
-          its "%d" format string).
-

     @header{wx/log.h}
 */
 void wxLogTrace(const char* mask, const char* formatString, ... );
     @header{wx/log.h}
 */
 void wxLogTrace(const char* mask, const char* formatString, ... );

-void wxVLogTrace(const char* mask,
-                  const char* formatString,
-                  va_list argPtr);
+void wxVLogTrace(const char* mask, const char* formatString, va_list argPtr);

 //@}
 
 /** @addtogroup group_funcmacro_log */
 //@}
 
 /** @addtogroup group_funcmacro_log */


@@ -1255,7 +1412,7 @@ void wxVLogStatus(const char* formatString, va_list argPtr);
 /**
     Mostly used by wxWidgets itself, but might be handy for logging errors
     after system call (API function) failure. It logs the specified message
 /**
     Mostly used by wxWidgets itself, but might be handy for logging errors
     after system call (API function) failure. It logs the specified message

-    text as well as the last system error code (@e errno or @e ::GetLastError()
+    text as well as the last system error code (@e errno or @e GetLastError()

     depending on the platform) and the corresponding error message. The second
     form of this function takes the error code explicitly as the first
     argument.
     depending on the platform) and the corresponding error message. The second
     form of this function takes the error code explicitly as the first
     argument.


@@ -1268,3 +1425,25 @@ void wxLogSysError(const char* formatString, ... );
 void wxVLogSysError(const char* formatString, va_list argPtr);
 //@}
 
 void wxVLogSysError(const char* formatString, va_list argPtr);
 //@}
 

+/** @addtogroup group_funcmacro_debug */
+//@{
+
+/**
+    @def wxDISABLE_DEBUG_LOGGING_IN_RELEASE_BUILD()
+
+    Use this macro to disable logging at debug and trace levels in release
+    build when not using wxIMPLEMENT_APP().
+
+    @see wxDISABLE_DEBUG_SUPPORT(),
+         wxDISABLE_ASSERTS_IN_RELEASE_BUILD(),
+         @ref overview_debugging
+
+    @since 2.9.1
+
+    @header{wx/log.h}
+ */
+#define wxDISABLE_DEBUG_LOGGING_IN_RELEASE_BUILD()
+
+//@}
+
+#endif // wxUSE_BASE