///////////////////////////////////////////////////////////////////////////// // Name: log.h // Purpose: interface of wxLogWindow // Author: wxWidgets team // RCS-ID: $Id$ // Licence: wxWindows license ///////////////////////////////////////////////////////////////////////////// /** Different standard log levels (you may also define your own) used with by standard wxLog functions wxLogError(), wxLogWarning(), etc... */ enum wxLogLevelValues { wxLOG_FatalError, //!< program can't continue, abort immediately wxLOG_Error, //!< a serious error, user must be informed about it wxLOG_Warning, //!< user is normally informed about it but may be ignored wxLOG_Message, //!< normal message (i.e. normal output of a non GUI app) wxLOG_Status, //!< informational: might go to the status line of GUI app wxLOG_Info, //!< informational message (a.k.a. 'Verbose') wxLOG_Debug, //!< never shown to the user, disabled in release mode wxLOG_Trace, //!< trace messages are also only enabled in debug mode wxLOG_Progress, //!< used for progress indicator (not yet) wxLOG_User = 100, //!< user defined levels start here wxLOG_Max = 10000 }; /** The type used to specify a log level. Default values of ::wxLogLevel used by wxWidgets are contained in the ::wxLogLevelValues enumeration. */ 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 (wxUSE_THREADS == 1). @see wxThread::GetCurrentId() */ wxThreadIdType threadId; }; /** @class wxLogWindow This class represents a background log window: to be precise, it collects all log messages in the log frame which it manages but also passes them on to the log target which was active at the moment of its creation. This allows you, for example, to show all the log messages in a frame but still continue to process them normally by showing the standard log dialog. @library{wxbase} @category{logging} @see wxLogTextCtrl */ class wxLogWindow : public wxLogInterposer { 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. */ wxLogWindow(wxWindow* pParent, const wxString& szTitle, bool show = true, bool passToOld = true); /** 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. @see OnFrameDelete() */ virtual bool OnFrameClose(wxFrame* frame); /** Called immediately after the log frame creation allowing for any extra initializations. */ virtual void OnFrameCreate(wxFrame* frame); /** Called right before the log frame is going to be deleted: will always be called unlike OnFrameClose(). */ virtual void OnFrameDelete(wxFrame* frame); /** Shows or hides the frame. */ void Show(bool show = true); }; /** @class wxLogInterposerTemp A special version of wxLogChain which uses itself as the new log target. It forwards log messages to the previously installed one in addition to processing them itself. Unlike wxLogInterposer, it doesn't delete the old target which means it can be used to temporarily redirect log output. As per wxLogInterposer, this class must be derived from to implement wxLog::DoLog and/or wxLog::DoLogString methods. @library{wxbase} @category{logging} */ class wxLogInterposerTemp : public wxLogChain { public: /** The default constructor installs this object as the current active log target. */ wxLogInterposerTemp(); }; /** @class wxLogChain This simple class allows you to chain log sinks, that is to install a new sink but keep passing log messages to the old one instead of replacing it completely as wxLog::SetActiveTarget does. It is especially useful when you want to divert the logs somewhere (for example to a file or a log window) but also keep showing the error messages using the standard dialogs as wxLogGui does by default. Example of usage: @code wxLogChain *logChain = new wxLogChain(new wxLogStderr); // all the log messages are sent to stderr and also processed as usually ... // don't delete logChain directly as this would leave a dangling // pointer as active log target, use SetActiveTarget() instead delete wxLog::SetActiveTarget(...something else or NULL...); @endcode @library{wxbase} @category{logging} */ class wxLogChain : public 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. */ wxLogChain(wxLog* logger); /** Destroys the previous log target. */ virtual ~wxLogChain(); /** Detaches the old log target so it won't be destroyed when the wxLogChain object is destroyed. */ void DetachOldLog(); /** Returns the pointer to the previously active log target (which may be @NULL). */ wxLog* GetOldLog() const; /** Returns @true if the messages are passed to the previously active log target (default) or @false if PassMessages() had been called. */ bool IsPassingMessages() const; /** 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. */ void PassMessages(bool passMessages); /** Sets another log target to use (may be @NULL). The log target specified in the wxLogChain(wxLog*) constructor or in a previous call to this function is deleted. This doesn't change the old log target value (the one the messages are forwarded to) which still remains the same as was active when wxLogChain object was created. */ void SetLog(wxLog* logger); }; /** @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 DoShowSingleMessage() to customize wxLogGui -- the dialogs sample shows how to do this. @library{wxcore} @category{logging} */ class wxLogGui : public wxLog { public: /** Default constructor. */ wxLogGui(); /** 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(); protected: /** Returns the appropriate title for the dialog. 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; /** 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; /** 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(); /** Method called by Flush() to show a single log message. This function can be overridden to show the message in a different way. By default a simple wxMessageBox() call is used. @param message The message to show (it can contain multiple lines). @param title The suggested title for the dialog showing the message, see GetTitle(). @param style One of @c wxICON_XXX constants, see GetSeverityIcon(). */ virtual void DoShowSingleLogMessage(const wxString& message, const wxString& title, int style); /** Method called by Flush() to show multiple log messages. 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. @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); /** 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; /** The time stamps of each logged message. The elements of this array are time_t values corresponding to the time when the message was logged. */ wxArrayLong m_aTimes; /** 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. 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; }; /** @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: /** Constructs a log target which sends all the log messages to the given output stream. If it is @NULL, the messages are sent to @c cerr. */ wxLogStream(std::ostream *ostr = NULL); }; /** @class wxLogStderr This class can be used to redirect the log messages to a C file stream (not to be confused with C++ streams). It is the default log target for the non-GUI wxWidgets applications which send all the output to @c stderr. @library{wxbase} @category{logging} @see wxLogStream */ class wxLogStderr : public wxLog { public: /** 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); }; /** @class wxLogBuffer wxLogBuffer is a very simple implementation of log sink which simply collects all the logged messages in a string (except the debug messages which are output in the usual way immediately as we're presumably not interested in collecting them for later). The messages from different log function calls are separated by the new lines. All the messages collected so far can be shown to the user (and the current buffer cleared) by calling the overloaded wxLogBuffer::Flush method. @library{wxbase} @category{logging} */ class wxLogBuffer : public wxLog { public: /** The default ctor does nothing. */ wxLogBuffer(); /** 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. */ virtual void Flush(); /** 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; }; /** @class wxLogInterposer A special version of wxLogChain which uses itself as the new log target. It forwards log messages to the previously installed one in addition to processing them itself. Unlike wxLogChain which is usually used directly as is, this class must be derived from to implement wxLog::DoLog and/or wxLog::DoLogString methods. wxLogInterposer destroys the previous log target in its destructor. If you don't want this to happen, use wxLogInterposerTemp instead. @library{wxbase} @category{logging} */ class wxLogInterposer : public wxLogChain { public: /** The default constructor installs this object as the current active log target. */ wxLogInterposer(); }; /** @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} @category{logging} @see wxTextCtrl, wxStreamToTextRedirector */ class wxLogTextCtrl : public wxLog { public: /** Constructs a log target which sends all the log messages to the given text control. The @a textctrl parameter cannot be @NULL. */ wxLogTextCtrl(wxTextCtrl* pTextCtrl); }; /** @class wxLog 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. Otherwise, it is completely hidden behind the @e 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 several methods which may be overridden in the derived class to customize log messages handling: DoLogRecord(), DoLogTextAtLevel() and DoLogText(). 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, 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() @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). 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. 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} @category{logging} @see @ref overview_log */ class wxLog { public: /** Add the @a mask to the list of allowed masks for wxLogTrace(). @see RemoveTraceMask(), GetTraceMasks() */ static void AddTraceMask(const wxString& mask); /** Removes all trace masks previously set with AddTraceMask(). @see RemoveTraceMask() */ 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. Note that this function also calls ClearTraceMasks(). */ 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. 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(); /** Returns whether the repetition counting mode is enabled. */ static bool GetRepetitionCounting(); /** Returns the current timestamp format string. */ static const wxString& GetTimestamp(); /** @deprecated Returns the current trace mask, see Customization() section for details. */ static wxTraceMask GetTraceMask(); /** Returns the currently allowed list of string trace masks. @see AddTraceMask(). */ static const wxArrayString& GetTraceMasks(); /** Returns whether the verbose mode is currently active. */ static bool GetVerbose(); /** 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. @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(). @see AddTraceMask() */ static void RemoveTraceMask(const wxString& mask); /** Resumes logging previously suspended by a call to Suspend(). All messages logged in the meanwhile will be flushed soon. */ static void Resume(); /** 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 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); /** 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); /** 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 % prefixed format specificators, see @e strftime() manual for details. Passing an empty string to this function disables message time stamping. */ static void SetTimestamp(const wxString& format); /** Disables time stamping of the log messages. @since 2.9.0 */ static void DisableTimestamp(); /** @deprecated Sets the trace mask, see @ref log_tracemasks section for details. */ static void SetTraceMask(wxTraceMask mask); /** Activates or deactivates verbose mode in which the verbose messages are logged as the normal ones instead of being silently dropped. */ 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). @see Resume(), wxLogNull */ static void Suspend(); /** 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(). 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); // and also send it to the new one if ( m_logNew && m_logNew != this ) m_logNew->LogRecord(level, msg, info); } @endcode @since 2.9.1 */ 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 created 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 log the specified string at given level. The base class versions logs debug and trace messages on the system default debug output channel and passes all the other messages to DoLogText(). */ virtual void DoLogTextAtLevel(wxLogLevel level, const wxString& msg); /** Called to log the specified string. A simple implementation might just send the string to @c stdout or @c stderr or save it in a file (of course, the already existing wxLogStderr can be used for this). The base class version of this function asserts so it must be overridden if you don't override DoLogRecord() or DoLogTextAtLevel(). */ virtual void DoLogText(const wxString& msg); //@} }; /** @class wxLogNull This class allows you to temporarily suspend logging. All calls to the log functions during the life time of an object of this class are just ignored. In particular, it can be used to suppress the log messages given by wxWidgets itself but it should be noted that it is rarely the best way to cope with this problem as @b all log messages are suppressed, even if they indicate a completely different error than the one the programmer wanted to suppress. For instance, the example of the overview: @code wxFile file; // wxFile.Open() normally complains if file can't be opened, we don't want it { wxLogNull logNo; if ( !file.Open("bar") ) ... process error ourselves ... } // ~wxLogNull called, old log sink restored wxLogMessage("..."); // ok @endcode would be better written as: @code wxFile file; // don't try to open file if it doesn't exist, we are prepared to deal with // this ourselves - but all other errors are not expected if ( wxFile::Exists("bar") ) { // gives an error message if the file couldn't be opened file.Open("bar"); } else { ... } @endcode @library{wxbase} @category{logging} */ class wxLogNull { public: /** Suspends logging. */ wxLogNull(); /** Resumes logging. */ ~wxLogNull(); }; // ============================================================================ // Global functions/macros // ============================================================================ /** @addtogroup group_funcmacro_log */ //@{ /** This function shows a message to the user in a safe way and should be safe to call even before the application has been initialized or if it is currently in some other strange state (for example, about to crash). Under Windows this function shows a message box using a native dialog instead of wxMessageBox() (which might be unsafe to call), elsewhere it simply prints the message to the standard output using the title as prefix. @param title The title of the message box shown to the user or the prefix of the message string. @param text The text to show to the user. @see wxLogFatalError() @header{wx/log.h} */ void wxSafeShowMessage(const wxString& title, const wxString& text); /** Returns the error code from the last system call. This function uses @c errno on Unix platforms and @c GetLastError under Win32. @see wxSysErrorMsg(), wxLogSysError() @header{wx/log.h} */ unsigned long wxSysErrorCode(); /** Returns the error message corresponding to the given system error code. If @a errCode is 0 (default), the last error code (as returned by wxSysErrorCode()) is used. @see wxSysErrorCode(), wxLogSysError() @header{wx/log.h} */ const wxChar* wxSysErrorMsg(unsigned long errCode = 0); //@} /** @addtogroup group_funcmacro_log */ //@{ /** For all normal, informational messages. They also appear in a message box by default (but it can be changed). @header{wx/log.h} */ void wxLogMessage(const char* formatString, ... ); void wxVLogMessage(const char* formatString, va_list argPtr); //@} /** @addtogroup group_funcmacro_log */ //@{ /** For verbose output. Normally, it is suppressed, but might be activated if the user wishes to know more details about the program progress (another, but possibly confusing name for the same function could be @c wxLogInfo). @header{wx/log.h} */ void wxLogVerbose(const char* formatString, ... ); void wxVLogVerbose(const char* formatString, va_list argPtr); //@} /** @addtogroup group_funcmacro_log */ //@{ /** For warnings - they are also normally shown to the user, but don't interrupt the program work. @header{wx/log.h} */ void wxLogWarning(const char* formatString, ... ); void wxVLogWarning(const char* formatString, va_list argPtr); //@} /** @addtogroup group_funcmacro_log */ //@{ /** Like wxLogError(), but also terminates the program with the exit code 3. Using @e abort() standard function also terminates the program with this exit code. @header{wx/log.h} */ void wxLogFatalError(const char* formatString, ... ); void wxVLogFatalError(const char* formatString, va_list argPtr); //@} /** @addtogroup group_funcmacro_log */ //@{ /** The functions to use for error messages, i.e. the messages that must be shown to the user. The default processing is to pop up a message box to inform the user about it. @header{wx/log.h} */ void wxLogError(const char* formatString, ... ); void wxVLogError(const char* formatString, va_list argPtr); //@} /** @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 make sense to separate them from other debug messages. 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); //@} /** @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 @ref overview_envvars "@c WXTRACE environment variable". The predefined string trace masks used by wxWidgets are: @beginDefList @itemdef{ wxTRACE_MemAlloc, Trace memory allocation (new/delete) } @itemdef{ wxTRACE_Messages, Trace window messages/X callbacks } @itemdef{ wxTRACE_ResAlloc, Trace GDI resource allocation } @itemdef{ wxTRACE_RefCount, Trace various ref counting operations } @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); //@} /** @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. @deprecated This version of wxLogTrace() only logs the message if all the bits corresponding to the @a mask are set in the wxLog trace mask which can be set by calling wxLog::SetTraceMask(). This version is less flexible than wxLogTrace(const char*,const char*,...) because it doesn't allow defining the user trace masks easily. This is why it is deprecated in favour of using string trace masks. The following bitmasks are defined for wxTraceMask: @beginDefList @itemdef{ wxTraceMemAlloc, Trace memory allocation (new/delete) } @itemdef{ wxTraceMessages, Trace window messages/X callbacks } @itemdef{ wxTraceResAlloc, Trace GDI resource allocation } @itemdef{ wxTraceRefCount, Trace various ref counting operations } @itemdef{ wxTraceOleCalls, Trace OLE method calls (Win32 only) } @endDefList @header{wx/log.h} */ void wxLogTrace(wxTraceMask mask, const char* formatString, ... ); void wxVLogTrace(wxTraceMask mask, const char* formatString, va_list argPtr); //@} /** @addtogroup group_funcmacro_log */ //@{ /** The right functions for debug output. They only do something in debug mode (when the preprocessor symbol @c __WXDEBUG__ is defined) and expand to nothing in release mode (otherwise). @header{wx/log.h} */ void wxLogDebug(const char* formatString, ... ); void wxVLogDebug(const char* formatString, va_list argPtr); //@} /** @addtogroup group_funcmacro_log */ //@{ /** Messages logged by this function will appear in the statusbar of the @a frame or of the top level application window by default (i.e. when using the second version of the functions). If the target frame doesn't have a statusbar, the message will be lost. @header{wx/log.h} */ void wxLogStatus(wxFrame* frame, const char* formatString, ... ); void wxVLogStatus(wxFrame* frame, const char* formatString, va_list argPtr); void wxLogStatus(const char* formatString, ... ); void wxVLogStatus(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() depending on the platform) and the corresponding error message. The second form of this function takes the error code explicitly as the first argument. @see wxSysErrorCode(), wxSysErrorMsg() @header{wx/log.h} */ void wxLogSysError(const char* formatString, ... ); 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() //@}