/////////////////////////////////////////////////////////////////////////////
// Name: log.h
-// Purpose: interface of wxLogWindow
+// Purpose: interface of wxLog* classes
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
Different standard log levels (you may also define your own) used with
- wxLog::OnLog() by standard wxLog functions wxLogError(), wxLogWarning(),
- etc...
+ by standard wxLog functions wxLogError(), wxLogWarning(), etc...
*/
enum wxLogLevelValues
{
*/
typedef unsigned long wxLogLevel;
+/**
+ Information about a log record (unit of the log output).
+ */
+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;
+
+ /**
+ Id of the thread in which the message was generated.
+
+ This field is only available if wxWidgets was built with threads
+ support (<code>wxUSE_THREADS == 1</code>).
+
+ @see wxThread::GetCurrentId()
+ */
+ wxThreadIdType threadId;
+};
/**
@class wxLogWindow
@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.
+ @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.
*/
wxLogWindow(wxWindow* pParent, const wxString& szTitle, bool show = true,
bool passToOld = true);
/**
@class wxLog
- wxLog class defines the interface for the @e log targets used by wxWidgets
+ wxLog class defines the interface for the <em>log targets</em> 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.
+ needs.
- Otherwise, it is completely hidden behind the @e wxLogXXX() functions and
- you may not even know about its existence.
+ Otherwise, it is completely hidden behind the @ref group_funcmacro_log "wxLogXXX() functions"
+ and you may not even know about its existence.
@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.
-
- @section log_derivingyours Deriving your own log target
-
- 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 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).
-
- 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 also:
- @li Flush()
- @li FlushActive()
-
-
- @section log_tracemasks Using trace masks
-
- 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.
-
- 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.
-
- For example,
- @code
- wxLogTrace( wxTRACE_OleCalls, "IFoo::Bar() called" );
- @endcode
-
- will log the message if it was preceded by:
-
- @code
- wxLog::AddTraceMask( wxTRACE_OleCalls);
- @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. The OnLog() is called by the @e wxLogXXX() functions
- and invokes the DoLog() of the active log target if any.
-
- 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 OnLog()
- @li GetActiveTarget()
- @li SetActiveTarget()
- @li DontCreateOnDemand()
- @li Suspend()
- @li Resume()
-
-
@library{wxcore}
@category{logging}
- @see @ref overview_log
+ @see @ref overview_log, @ref group_funcmacro_log "wxLogXXX() functions"
*/
class wxLog
{
public:
+ /**
+ @name Trace mask functions
+ */
+ //@{
+
/**
Add the @a mask to the list of allowed masks for wxLogTrace().
static void ClearTraceMasks();
/**
- 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.
+ Returns the currently allowed list of string trace masks.
- Note that this function also calls ClearTraceMasks().
+ @see AddTraceMask().
*/
- static void DontCreateOnDemand();
+ static const wxArrayString& GetTraceMasks();
/**
- Shows all the messages currently in buffer and clears it.
- If the buffer is already empty, nothing happens.
+ Returns @true if the @a mask is one of allowed masks for wxLogTrace().
+
+ See also: AddTraceMask(), RemoveTraceMask()
*/
- virtual void Flush();
+ static bool IsAllowedTraceMask(const wxString& mask);
/**
- Flushes the current log target if any, does nothing if there is none.
+ Remove the @a mask from the list of allowed masks for
+ wxLogTrace().
- @see Flush()
+ @see AddTraceMask()
*/
- static void FlushActive();
+ static void RemoveTraceMask(const wxString& mask);
+
+ //@}
+
+
/**
- Returns the pointer to the active log target (may be @NULL).
+ @name Log target functions
*/
- static wxLog* GetActiveTarget();
-
+ //@{
+
/**
- Returns the current log level limit.
+ Instructs wxLog to not create new log targets on the fly if there is none
+ currently (see GetActiveTarget()).
+
+ (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).
+
+ Note that this function also calls ClearTraceMasks().
*/
- static wxLogLevel GetLogLevel();
+ static void DontCreateOnDemand();
/**
- Returns whether the repetition counting mode is enabled.
+ 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 bool GetRepetitionCounting();
+ static wxLog* GetActiveTarget();
/**
- Returns the current timestamp format string.
+ 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()
*/
- static const wxString& GetTimestamp();
+ static wxLog* SetActiveTarget(wxLog* logtarget);
/**
- @deprecated
- Returns the current trace mask, see Customization() section for details.
- */
- static wxTraceMask GetTraceMask();
+ Sets a thread-specific log target.
+ 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.
+
+ 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);
+
/**
- Returns the currently allowed list of string trace masks.
+ Flushes the current log target if any, does nothing if there is none.
- @see AddTraceMask().
+ 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 const wxArrayString& GetTraceMasks();
-
+ static void FlushActive();
+
/**
- Returns whether the verbose mode is currently active.
+ Resumes logging previously suspended by a call to Suspend().
+ All messages logged in the meanwhile will be flushed soon.
*/
- static bool GetVerbose();
+ static void Resume();
/**
- Returns @true if the @a mask is one of allowed masks for wxLogTrace().
+ Suspends the logging until Resume() is called.
- See also: AddTraceMask(), RemoveTraceMask()
+ 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 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 bool IsAllowedTraceMask(const wxString& mask);
+ static void Suspend();
+
+ //@}
+
+
/**
- Forwards the message at specified level to the @e DoLog() function of the
- active log target if there is any, does nothing otherwise.
+ @name Log level functions
*/
- static void OnLog(wxLogLevel level, const wxString& msg, time_t t);
-
+ //@{
+
/**
- Remove the @a mask from the list of allowed masks for
- wxLogTrace().
+ Returns the current log level limit.
- @see AddTraceMask()
- */
- static void RemoveTraceMask(const wxString& mask);
+ All messages at levels strictly greater than the value returned by this
+ function are not logged at all.
- /**
- Resumes logging previously suspended by a call to Suspend().
- All messages logged in the meanwhile will be flushed soon.
+ @see SetLogLevel(), IsLevelEnabled()
*/
- static void Resume();
+ static wxLogLevel GetLogLevel();
+
+ /**
+ Returns true if logging at this level is enabled for the current thread.
+
+ 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);
/**
- Sets the specified log target as the active one.
+ Sets the log level for the given component.
- 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.
- */
- static wxLog* SetActiveTarget(wxLog* logtarget);
+ 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.
+
+ @since 2.9.1
+ */
+ static void SetComponentLevel(const wxString& component, wxLogLevel level);
/**
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);
+
+ //@}
+
+
+
+ /**
+ @name Enable/disable features functions
+ */
+ //@{
+
+ /**
+ Globally enable or disable logging.
+
+ Calling this function with @false argument disables all log messages
+ for the current thread.
+
+ @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 true if logging is enabled at all now.
+
+ @see IsLevelEnabled(), EnableLogging()
+ */
+ static bool IsEnabled();
+
+ /**
+ Returns whether the repetition counting mode is enabled.
+ */
+ static bool GetRepetitionCounting();
/**
Enables logging mode in which a log message is logged once, and in case exactly
repetitions is logged.
*/
static void SetRepetitionCounting(bool repetCounting = true);
+
+ /**
+ Returns the current timestamp format string.
+ */
+ 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 specificators, see @e strftime() manual for details.
+ prefixed format specifiers, see @e strftime() manual for details.
Passing an empty string to this function disables message time stamping.
*/
static void SetTimestamp(const wxString& format);
@since 2.9.0
*/
static void DisableTimestamp();
-
+
/**
- @deprecated
- Sets the trace mask, see @ref log_tracemasks section for details.
+ Returns whether the verbose mode is currently active.
*/
- static void SetTraceMask(wxTraceMask mask);
+ static bool GetVerbose();
/**
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
*/
static void SetVerbose(bool verbose = 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).
+ 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.
- @see Resume(), wxLogNull
+ If you override this method in a derived class, call the base class
+ version first, before doing anything else.
*/
- static void Suspend();
-
+ virtual void Flush();
+
/**
- Log the given message.
+ Log the given record.
This function should only be called from the DoLog() implementations in
- the derived classes (which can't call wxLog::DoLog() directly as it is
- protected), 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().
+ 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::DoLog(wxLogLevel level, const wxString& msg, time_t t)
+ void wxLogChain::DoLogRecord(wxLogLevel level,
+ const wxString& msg,
+ const wxLogRecordInfo& info)
{
// let the previous logger show it
if ( m_logOld && IsPassingMessages() )
- m_logOld->Log(level, msg, t);
+ m_logOld->LogRecord(level, msg, info);
// and also send it to the new one
if ( m_logNew && m_logNew != this )
- m_logNew->Log(level, msg, t);
+ m_logNew->LogRecord(level, msg, info);
}
@endcode
- @since 2.9.0
+ @since 2.9.1
*/
- void Log(wxLogLevel level, const wxString& msg, time_t timestamp);
+ void LogRecord(wxLogLevel level, const wxString& msg, time_t timestamp);
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().
+ */
+ //@{
+
+ /**
+ Called to log a new record.
+
+ 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().
+
+ 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 process the message of the specified severity. @a msg is the text
- of the message as specified in the call of @e wxLogXXX() function which
- generated it and @a timestamp is the moment when the message was generated.
+ Called to log the specified string at given level.
- The base class version prepends the timestamp to the message, adds a prefix
- corresponding to the log level and then calls
- DoLogString() with the resulting string.
+ 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 DoLog(wxLogLevel level, const wxString& msg, time_t timestamp);
+ virtual void DoLogTextAtLevel(wxLogLevel level, const wxString& msg);
/**
- Called to log the specified string. The timestamp is already included in the
- string but still passed to this function.
+ Called to log the specified string.
- A simple implementation may just send the string to @c stdout or, better,
- @c stderr.
+ 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 DoLogString(const wxString& msg, time_t timestamp);
+ virtual void DoLogText(const wxString& msg);
+
+ //@}
};
@library{wxbase}
@category{logging}
*/
-class wxLogNull : public wxLog
+class wxLogNull
{
public:
/**
/** @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().
+ 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.
- @header{wx/log.h}
-*/
-void wxLogTrace(const char *mask, const char* formatString, ... );
-void wxVLogTrace(const char *mask, const char* formatString, va_list argPtr);
-//@}
-
-/** @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 */
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()
+
+//@}
+
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