/////////////////////////////////////////////////////////////////////////////
// Name: log.h
-// Purpose: interface of wxLogWindow
+// Purpose: interface of wxLog* classes
// 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
- by standard wxLog functions wxLogError(), wxLogWarning(), etc...
+ by standard wxLog functions wxLogGeneric(), wxLogError(), wxLogWarning(), etc...
*/
enum wxLogLevelValues
{
};
/**
- @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}
- @see wxLogTextCtrl
+ @see @ref overview_log
+
+ @since 2.9.4
*/
-class wxLogWindow : public wxLogInterposer
+class wxLogFormatter
{
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).
-
- Return @true from here to allow the frame to close, @false to
- prevent this from happening.
+ This function creates the full log message string.
- @see OnFrameDelete()
- */
- virtual bool OnFrameClose(wxFrame* frame);
+ Override it to customize the output string format.
- /**
- Called immediately after the log frame creation allowing for
- any extra initializations.
- */
- virtual void OnFrameCreate(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 right before the log frame is going to be deleted: will
- always be called unlike OnFrameClose().
+ @return
+ The formated message.
+
+ @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);
-};
-
-
-
-/**
- @class wxLogInterposerTemp
+ This function formats the time stamp part of the log message.
- 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.
+ Override this function if you need to customize just the time stamp.
- As per wxLogInterposer, this class must be derived from to implement
- wxLog::DoLog and/or wxLog::DoLogString methods.
+ @param time
+ Time to format.
- @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}
+
+ @see @ref overview_log, @ref group_funcmacro_log "wxLogXXX() functions"
*/
-class wxLogChain : public wxLog
+class wxLog
{
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.
- @library{wxcore}
- @category{logging}
-*/
-class wxLogGui : public wxLog
-{
-public:
- /**
- Default constructor.
+ 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.
*/
- wxLogGui();
+ static wxLog* GetActiveTarget();
/**
- Presents the accumulated log messages, if any, to the user.
-
- 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();
+ Sets the specified log target as the active one.
-protected:
- /**
- Returns the appropriate title for the dialog.
+ 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.
- 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;
+ @see SetThreadActiveTarget()
+ */
+ static wxLog* SetActiveTarget(wxLog* logtarget);
/**
- Returns wxICON_ERROR, wxICON_WARNING or wxICON_INFORMATION depending on
- the current maximal severity.
-
- This value is suitable to be used in the style parameter of
- wxMessageBox() function.
- */
- int GetSeverityIcon() const;
+ Sets a thread-specific log target.
- /**
- Forgets all the currently stored messages.
+ 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.
- 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();
+ Notice that unlike for SetActiveTarget(), wxWidgets does not destroy
+ the thread-specific log targets when the thread terminates so doing
+ this is your responsibility.
+
+ This method is only available if @c wxUSE_THREADS is 1, i.e. wxWidgets
+ was compiled with threads support.
+
+ @param logger
+ The new thread-specific log target, possibly @NULL.
+ @return
+ The previous thread-specific log target, initially @NULL.
+ @since 2.9.1
+ */
+ static wxLog *SetThreadActiveTarget(wxLog *logger);
/**
- Method called by Flush() to show a single log message.
+ Flushes the current log target if any, does nothing if there is none.
- This function can be overridden to show the message in a different way.
- By default a simple wxMessageBox() call is used.
+ 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();
- @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.
+ 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.
+
+ @see IsEnabled(), SetLogLevel(), GetLogLevel(), SetComponentLevel()
+
+ @since 2.9.1
*/
- bool m_bWarnings;
+ static bool IsLevelEnabled(wxLogLevel level, wxString component);
/**
- True if there any messages to be shown to the user.
+ Sets the log level for the given component.
- 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;
-};
+ For example, to disable all but error messages from wxWidgets network
+ classes you may use
+ @code
+ wxLog::SetComponentLevel("wx/net", wxLOG_Error);
+ @endcode
+ SetLogLevel() may be used to set the global log level.
+ @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.
-/**
- @class wxLogStream
+ @since 2.9.1
+ */
+ static void SetComponentLevel(const wxString& component, wxLogLevel level);
- This class can be used to redirect the log messages to a C++ stream.
+ /**
+ Specifies that log messages with level greater (numerically) than
+ @a logLevel should be ignored and not sent to the active log target.
+
+ @see SetComponentLevel()
+ */
+ static void SetLogLevel(wxLogLevel logLevel);
+
+ //@}
- 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:
/**
- 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.
+ @name Enable/disable features functions
*/
- wxLogStream(std::ostream *ostr = NULL);
-};
+ //@{
+ /**
+ Globally enable or disable logging.
+ Calling this function with @false argument disables all log messages
+ for the current thread.
-/**
- @class wxLogStderr
+ @see wxLogNull, IsEnabled()
- This class can be used to redirect the log messages to a C file stream (not to
- be confused with C++ streams).
+ @return
+ The old state, i.e. @true if logging was previously enabled and
+ @false if it was disabled.
+ */
+ static bool EnableLogging(bool enable = true);
- It is the default log target for the non-GUI wxWidgets applications which
- send all the output to @c stderr.
+ /**
+ Returns true if logging is enabled at all now.
- @library{wxbase}
- @category{logging}
+ @see IsLevelEnabled(), EnableLogging()
+ */
+ static bool IsEnabled();
- @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.
+ Returns whether the repetition counting mode is enabled.
*/
- wxLogStderr(FILE* fp = NULL);
-};
+ static bool GetRepetitionCounting();
+ /**
+ 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.
+ */
+ static void SetRepetitionCounting(bool repetCounting = true);
+ /**
+ Returns the current timestamp format string.
-/**
- @class wxLogBuffer
+ 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();
- 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.
+ /**
+ 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.
- All the messages collected so far can be shown to the user (and the current
- buffer cleared) by calling the overloaded wxLogBuffer::Flush method.
+ 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);
- @library{wxbase}
- @category{logging}
-*/
-class wxLogBuffer : public wxLog
-{
-public:
/**
- The default ctor does nothing.
+ Disables time stamping of the log messages.
+
+ Notice that the current time stamp is only used by the default log
+ formatter and custom formatters may ignore calls to this function.
+
+ @since 2.9.0
*/
- wxLogBuffer();
+ static void DisableTimestamp();
/**
- 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.
+ Returns whether the verbose mode is currently active.
*/
- virtual void Flush();
+ static bool GetVerbose();
/**
- 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.
+ Activates or deactivates verbose mode in which the verbose messages are
+ logged as the normal ones instead of being silently dropped.
+
+ The verbose messages are the trace messages which are not disabled in the
+ release mode and are generated by wxLogVerbose().
+
+ @see @ref overview_log
*/
- const wxString& GetBuffer() const;
-};
+ static void SetVerbose(bool verbose = true);
+ //@}
-/**
- @class wxLogInterposer
+ /**
+ Sets the specified formatter as the active one.
- 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.
+ @param formatter
+ The new formatter. If @NULL, reset to the default formatter.
- Unlike wxLogChain which is usually used directly as is, this class must be
- derived from to implement wxLog::DoLog and/or wxLog::DoLogString methods.
+ 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.
+
+ @since 2.9.4
+ */
+ wxLogFormatter *SetFormatter(wxLogFormatter* formatter);
- 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:
/**
- The default constructor installs this object as the current active 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.
+
+ If you override this method in a derived class, call the base class
+ version first, before doing anything else.
*/
- wxLogInterposer();
-};
+ virtual void Flush();
+ /**
+ Log the given record.
+ 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().
-/**
- @class wxLogTextCtrl
+ 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);
- 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.
+ // and also send it to the new one
+ if ( m_logNew && m_logNew != this )
+ m_logNew->LogRecord(level, msg, info);
+ }
+ @endcode
- @library{wxbase}
- @category{logging}
+ @since 2.9.1
+ */
+ void LogRecord(wxLogLevel level, const wxString& msg, const wxLogRecordInfo& info);
- @see wxTextCtrl, wxStreamToTextRedirector
-*/
-class wxLogTextCtrl : public wxLog
-{
-public:
+protected:
/**
- Constructs a log target which sends all the log messages to the given text
- control. The @a textctrl parameter cannot be @NULL.
- */
- wxLogTextCtrl(wxTextCtrl* pTextCtrl);
-};
-
+ @name Logging callbacks.
+ The functions which should be overridden by custom log targets.
-/**
- @class wxLog
+ 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().
+ */
+ //@{
- 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.
+ /**
+ Called to log a new record.
- Otherwise, it is completely hidden behind the @e wxLogXXX() functions and
- you may not even know about its existence.
+ 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().
- @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.
+ 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);
+ /**
+ Called to log the specified string at given level.
- @section log_derivingyours Deriving your own log target
+ 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);
- There are several methods which may be overridden in the derived class to
- customize log messages handling: DoLogRecord(), DoLogTextAtLevel() and
- DoLogText().
+ /**
+ Called to log the specified string.
- The last method is the simplest one: you should override it if you simply
- want to redirect the log output elsewhere, without taking into account the
- level of the message. If you do want to handle messages of different levels
- differently, then you should override DoLogTextAtLevel().
+ 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).
- Finally, if more control over the output format is needed, then the first
- function must be overridden as it 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).
+ 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);
- 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).
+ //@}
+};
- Flush() shows them all and clears the buffer contents.
- This function doesn't do anything if the buffer is already empty.
- @see FlushActive()
+/**
+ @class wxLogChain
- @section log_tracemasks Using trace masks
+ 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.
- 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.
+ 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.
- 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.
+ Example of usage:
- For example,
@code
- wxLogTrace( wxTRACE_OleCalls, "IFoo::Bar() called" );
- @endcode
+ wxLogChain *logChain = new wxLogChain(new wxLogStderr);
- will log the message if it was preceded by:
+ // all the log messages are sent to stderr and also processed as usually
+ ...
- @code
- wxLog::AddTraceMask( wxTRACE_OleCalls);
+ // 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
- 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()
-
-
- @library{wxcore}
+ @library{wxbase}
@category{logging}
-
- @see @ref overview_log
*/
-class wxLog
+class wxLogChain : public wxLog
{
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();
/**
- Globally enable or disable logging.
-
- Calling this function with @false argument disables all log messages.
-
- @see wxLogNull, IsEnabled()
-
- @return
- The old state, i.e. @true if logging was previously enabled and
- @false if it was disabled.
- */
- static bool EnableLogging(bool enable = true);
+ Returns the pointer to the previously active log target (which may be @NULL).
+ */
+ wxLog* GetOldLog() const;
/**
- Shows all the messages currently in buffer and clears it.
-
- If the buffer is already empty, nothing happens.
+ Returns @true if the messages are passed to the previously active log
+ target (default) or @false if PassMessages() had been called.
+ */
+ bool IsPassingMessages() const;
- If you override this method in a derived class, call the base class
- version first, before doing anything else.
+ /**
+ 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.
*/
- virtual void Flush();
+ void PassMessages(bool passMessages);
/**
- Flushes the current log target if any, does nothing if there is none.
+ Sets another log target to use (may be @NULL).
- 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().
+ 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 void FlushActive();
+ void SetLog(wxLog* logger);
+};
- /**
- Returns the pointer to the active log target (may be @NULL).
- 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();
+/**
+ @class wxLogInterposer
- /**
- Returns the current log level limit.
+ 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.
- All messages at levels strictly greater than the value returned by this
- function are not logged at all.
+ Unlike wxLogChain which is usually used directly as is, this class must be
+ derived from to implement wxLog::DoLog and/or wxLog::DoLogString methods.
- @see SetLogLevel(), IsLevelEnabled()
- */
- static wxLogLevel GetLogLevel();
+ 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();
+};
- /**
- Returns the current timestamp format string.
- */
- static const wxString& GetTimestamp();
+
+/**
+ @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:
/**
- @deprecated
- Returns the current trace mask, see Customization() section for details.
+ The default constructor installs this object as the current active log target.
*/
- static wxTraceMask GetTraceMask();
+ wxLogInterposerTemp();
+};
- /**
- Returns the currently allowed list of string trace masks.
- @see AddTraceMask().
- */
- static const wxArrayString& GetTraceMasks();
+/**
+ @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:
/**
- Returns whether the verbose mode is currently active.
+ 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 bool GetVerbose();
+ wxLogStream(std::ostream *ostr = NULL);
+};
- /**
- Returns @true if the @a mask is one of allowed masks for wxLogTrace().
- See also: AddTraceMask(), RemoveTraceMask()
- */
- static bool IsAllowedTraceMask(const wxString& mask);
- /**
- Returns true if logging is enabled at all now.
+/**
+ @class wxLogStderr
- @see IsLevelEnabled(), EnableLogging()
- */
- static bool IsEnabled();
+ 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 true if logging at this level is enabled.
+ 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.
+ */
+ wxLogStderr(FILE* fp = NULL);
+};
- 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.
- @see IsEnabled(), SetLogLevel(), GetLogLevel(), SetComponentLevel()
- @since 2.9.1
- */
- static bool IsLevelEnabled(wxLogLevel level, wxString component);
+/**
+ @class wxLogBuffer
- /**
- Remove the @a mask from the list of allowed masks for
- wxLogTrace().
+ 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.
- @see AddTraceMask()
+ 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.
- @see SetThreadActiveTarget()
- */
- static wxLog* SetActiveTarget(wxLog* logtarget);
- /**
- Sets the log level for the given component.
+/**
+ @class wxLogNull
- 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 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.
- SetLogLevel() may be used to set the global log level.
+ 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.
- @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.
+ For instance, the example of the overview:
- @since 2.9.1
- */
- static void SetComponentLevel(const wxString& component, wxLogLevel level);
+ @code
+ wxFile file;
- /**
- Specifies that log messages with level greater (numerically) than
- @a logLevel should be ignored and not sent to the active log target.
+ // 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
- @see SetComponentLevel()
- */
- static void SetLogLevel(wxLogLevel logLevel);
+ 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:
/**
- 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.
+ Suspends logging.
*/
- static void SetRepetitionCounting(bool repetCounting = true);
+ wxLogNull();
/**
- Sets a thread-specific log target.
+ Resumes logging.
+ */
+ ~wxLogNull();
+};
- 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.
+#endif // wxUSE_BASE
- Notice that unlike for SetActiveTarget(), wxWidgets does not destroy
- the thread-specific log targets when the thread terminates so doing
- this is your responsibility.
+#if wxUSE_GUI
- This method is only available if @c wxUSE_THREADS is 1, i.e. wxWidgets
- was compiled with threads support.
+/**
+ @class wxLogWindow
- @param logger
- The new thread-specific log target, possibly @NULL.
- @return
- The previous thread-specific log target, initially @NULL.
+ 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.
- @since 2.9.1
- */
- static wxLog *SetThreadActiveTarget(wxLog *logger);
+ @library{wxcore}
+ @category{logging}
+ @see wxLogTextCtrl
+*/
+class wxLogWindow : public wxLogInterposer
+{
+public:
/**
- 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.
+ 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 SetTimestamp(const wxString& format);
+ wxLogWindow(wxWindow* pParent, const wxString& szTitle, bool show = true,
+ bool passToOld = true);
/**
- Disables time stamping of the log messages.
-
- @since 2.9.0
+ 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 DisableTimestamp();
+ wxFrame* GetFrame() const;
/**
- @deprecated
- Sets the trace mask, see @ref log_tracemasks section for details.
+ Called if the user closes the window interactively, will not be
+ called if it is destroyed for another reason (such as when program
+ exits).
+
+ Return @true from here to allow the frame to close, @false to
+ prevent this from happening.
+
+ @see OnFrameDelete()
*/
- static void SetTraceMask(wxTraceMask mask);
+ virtual bool OnFrameClose(wxFrame* frame);
/**
- Activates or deactivates verbose mode in which the verbose messages are
- logged as the normal ones instead of being silently dropped.
+ Called right before the log frame is going to be deleted: will
+ always be called unlike OnFrameClose().
*/
- static void SetVerbose(bool verbose = true);
+ virtual void OnFrameDelete(wxFrame* frame);
/**
- Suspends the logging until Resume() is called.
+ Shows or hides the frame.
+ */
+ void Show(bool show = true);
+};
- 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).
- @see Resume(), wxLogNull
- */
- static void Suspend();
+/**
+ @class wxLogGui
+
+ 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}
+
+ @see wxTextCtrl, wxStreamToTextRedirector
*/
-class wxLogNull
+class wxLogTextCtrl : public wxLog
{
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
//@}
+/** @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 */
//@{
/**
- 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.
- 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:
@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, ... );
-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 */
/**
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.
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
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