/**
Information about a log record (unit of the log output).
*/
-struct wxLogRecordInfo
+class wxLogRecordInfo
{
+public:
+ /// The name of the file where this log message was generated.
+ const char *filename;
+
+ /// The line number at which this log message was generated.
+ int line;
+
+ /**
+ The name of the function where the log record was generated.
+
+ This field may be @NULL if the compiler doesn't support @c __FUNCTION__
+ (but most modern compilers do).
+ */
+ const char *func;
+
/// Time when the log message was generated.
time_t timestamp;
@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.
+ There are several methods which may be overridden in the derived class to
+ customize log messages handling: DoLogRecord(), DoLogTextAtLevel() and
+ DoLogText().
- 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).
+ 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().
+
+ 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).
There also functions to support message buffering. Why are they needed?
Some of wxLog implementations, most notably the standard wxLogGui class,
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()
+ @see FlushActive()
@section log_tracemasks Using trace masks
+ Notice that the use of log trace masks is hardly necessary any longer in
+ current wxWidgets version as the same effect can be achieved by using
+ different log components for different log statements of any level. Please
+ see @ref overview_log_enable for more information about the log components.
+
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).
*/
static void DontCreateOnDemand();
+ /**
+ 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);
+
/**
Shows all the messages currently in buffer and clears it.
+
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.
*/
virtual void Flush();
/**
Flushes the current log target if any, does nothing if there is none.
- @see Flush()
+ 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();
/**
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();
/**
Returns the current log level limit.
+
+ All messages at levels strictly greater than the value returned by this
+ function are not logged at all.
+
+ @see SetLogLevel(), IsLevelEnabled()
*/
static wxLogLevel GetLogLevel();
*/
static bool IsAllowedTraceMask(const wxString& mask);
+ /**
+ Returns true if logging is enabled at all now.
+
+ @see IsLevelEnabled(), EnableLogging()
+ */
+ static bool IsEnabled();
+
+ /**
+ 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);
+
/**
Remove the @a mask from the list of allowed masks for
wxLogTrace().
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.
+
+ 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);
*/
static void SetRepetitionCounting(bool repetCounting = true);
+ /**
+ 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);
+
/**
Sets the timestamp format prepended by the default log targets to all
messages. The string may contain any normal characters as well as %
/** @addtogroup group_funcmacro_log */
//@{
/**
+ Log a message at wxLOG_Trace log level.
+
+ 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.
+
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
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 IMPLEMENT_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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