///////////////////////////////////////////////////////////////////////////// // Name: wx/log.h // Purpose: Assorted wxLogXXX functions, and wxLog (sink for logs) // Author: Vadim Zeitlin // Modified by: // Created: 29/01/98 // RCS-ID: $Id$ // Copyright: (c) 1998 Vadim Zeitlin // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// #ifndef _WX_LOG_H_ #define _WX_LOG_H_ #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) #pragma interface "log.h" #endif #include "wx/defs.h" #if wxUSE_LOG #include "wx/string.h" #include "wx/arrstr.h" // ---------------------------------------------------------------------------- // forward declarations // ---------------------------------------------------------------------------- #if wxUSE_GUI class WXDLLIMPEXP_CORE wxTextCtrl; class WXDLLIMPEXP_CORE wxLogFrame; class WXDLLIMPEXP_CORE wxFrame; #endif // wxUSE_GUI // ---------------------------------------------------------------------------- // types // ---------------------------------------------------------------------------- typedef unsigned long wxTraceMask; typedef unsigned long wxLogLevel; // ---------------------------------------------------------------------------- // headers // ---------------------------------------------------------------------------- #ifndef __WXWINCE__ #include // for time_t #endif #include "wx/dynarray.h" #ifndef wxUSE_LOG_DEBUG # ifdef __WXDEBUG__ # define wxUSE_LOG_DEBUG 1 # else // !__WXDEBUG__ # define wxUSE_LOG_DEBUG 0 # endif #endif // ---------------------------------------------------------------------------- // constants // ---------------------------------------------------------------------------- // different standard log levels (you may also define your own) enum { 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 }; // symbolic trace masks - wxLogTrace("foo", "some trace message...") will be // discarded unless the string "foo" has been added to the list of allowed // ones with AddTraceMask() #define wxTRACE_MemAlloc wxT("memalloc") // trace memory allocation (new/delete) #define wxTRACE_Messages wxT("messages") // trace window messages/X callbacks #define wxTRACE_ResAlloc wxT("resalloc") // trace GDI resource allocation #define wxTRACE_RefCount wxT("refcount") // trace various ref counting operations #ifdef __WXMSW__ #define wxTRACE_OleCalls wxT("ole") // OLE interface calls #endif // the trace masks have been superceded by symbolic trace constants, they're // for compatibility only andwill be removed soon - do NOT use them // meaning of different bits of the trace mask (which allows selectively // enable/disable some trace messages) #define wxTraceMemAlloc 0x0001 // trace memory allocation (new/delete) #define wxTraceMessages 0x0002 // trace window messages/X callbacks #define wxTraceResAlloc 0x0004 // trace GDI resource allocation #define wxTraceRefCount 0x0008 // trace various ref counting operations #ifdef __WXMSW__ #define wxTraceOleCalls 0x0100 // OLE interface calls #endif #include "wx/iosfwrap.h" // ---------------------------------------------------------------------------- // derive from this class to redirect (or suppress, or ...) log messages // normally, only a single instance of this class exists but it's not enforced // ---------------------------------------------------------------------------- class WXDLLIMPEXP_BASE wxLog { public: // ctor wxLog(); // Internal buffer. // Allow replacement of the fixed size static buffer with // a user allocated one. Pass in NULL to restore the // built in static buffer. static wxChar *SetLogBuffer( wxChar *buf, size_t size = 0 ); // these functions allow to completely disable all log messages // is logging disabled now? static bool IsEnabled() { return ms_doLog; } // change the flag state, return the previous one static bool EnableLogging(bool doIt = TRUE) { bool doLogOld = ms_doLog; ms_doLog = doIt; return doLogOld; } // static sink function - see DoLog() for function to overload in the // derived classes static void OnLog(wxLogLevel level, const wxChar *szString, time_t t) { if ( IsEnabled() && ms_logLevel >= level ) { wxLog *pLogger = GetActiveTarget(); if ( pLogger ) pLogger->DoLog(level, szString, t); } } // message buffering // flush shows all messages if they're not logged immediately (FILE // and iostream logs don't need it, but wxGuiLog does to avoid showing // 17 modal dialogs one after another) virtual void Flush(); // flush the active target if any static void FlushActive() { if ( !ms_suspendCount ) { wxLog *log = GetActiveTarget(); if ( log ) log->Flush(); } } // only one sink is active at each moment // get current log target, will call wxApp::CreateLogTarget() to // create one if none exists static wxLog *GetActiveTarget(); // change log target, pLogger may be NULL static wxLog *SetActiveTarget(wxLog *pLogger); // suspend the message flushing of the main target until the next call // to Resume() - this is mainly for internal use (to prevent wxYield() // from flashing the messages) static void Suspend() { ms_suspendCount++; } // must be called for each Suspend()! static void Resume() { ms_suspendCount--; } // functions controlling the default wxLog behaviour // verbose mode is activated by standard command-line '-verbose' // option static void SetVerbose(bool bVerbose = TRUE) { ms_bVerbose = bVerbose; } // Set log level. Log messages with level > logLevel will not be logged. static void SetLogLevel(wxLogLevel logLevel) { ms_logLevel = logLevel; } // should GetActiveTarget() try to create a new log object if the // current is NULL? static void DontCreateOnDemand(); // trace mask (see wxTraceXXX constants for details) static void SetTraceMask(wxTraceMask ulMask) { ms_ulTraceMask = ulMask; } // add string trace mask static void AddTraceMask(const wxString& str) { ms_aTraceMasks.push_back(str); } // add string trace mask static void RemoveTraceMask(const wxString& str); // remove all string trace masks static void ClearTraceMasks(); // get string trace masks static const wxArrayString &GetTraceMasks() { return ms_aTraceMasks; } // sets the timestamp string: this is used as strftime() format string // for the log targets which add time stamps to the messages - set it // to NULL to disable time stamping completely. static void SetTimestamp(const wxChar *ts) { ms_timestamp = ts; } // accessors // gets the verbose status static bool GetVerbose() { return ms_bVerbose; } // get trace mask static wxTraceMask GetTraceMask() { return ms_ulTraceMask; } // is this trace mask in the list? static bool IsAllowedTraceMask(const wxChar *mask); // return the current loglevel limit static wxLogLevel GetLogLevel() { return ms_logLevel; } // get the current timestamp format string (may be NULL) static const wxChar *GetTimestamp() { return ms_timestamp; } // helpers // put the time stamp into the string if ms_timestamp != NULL (don't // change it otherwise) static void TimeStamp(wxString *str); // make dtor virtual for all derived classes virtual ~wxLog() { } // this method exists for backwards compatibility only, don't use bool HasPendingMessages() const { return TRUE; } protected: // the logging functions that can be overriden // default DoLog() prepends the time stamp and a prefix corresponding // to the message to szString and then passes it to DoLogString() virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t); // default DoLogString does nothing but is not pure virtual because if // you override DoLog() you might not need it at all virtual void DoLogString(const wxChar *szString, time_t t); private: // static variables // ---------------- static wxLog *ms_pLogger; // currently active log sink static bool ms_doLog; // FALSE => all logging disabled static bool ms_bAutoCreate; // create new log targets on demand? static bool ms_bVerbose; // FALSE => ignore LogInfo messages static wxLogLevel ms_logLevel; // limit logging to levels <= ms_logLevel static size_t ms_suspendCount; // if positive, logs are not flushed // format string for strftime(), if NULL, time stamping log messages is // disabled static const wxChar *ms_timestamp; static wxTraceMask ms_ulTraceMask; // controls wxLogTrace behaviour static wxArrayString ms_aTraceMasks; // more powerful filter for wxLogTrace }; // ---------------------------------------------------------------------------- // "trivial" derivations of wxLog // ---------------------------------------------------------------------------- // log everything to a "FILE *", stderr by default class WXDLLIMPEXP_BASE wxLogStderr : public wxLog { DECLARE_NO_COPY_CLASS(wxLogStderr) public: // redirect log output to a FILE wxLogStderr(FILE *fp = (FILE *) NULL); protected: // implement sink function virtual void DoLogString(const wxChar *szString, time_t t); FILE *m_fp; }; #if wxUSE_STD_IOSTREAM // log everything to an "ostream", cerr by default class WXDLLIMPEXP_BASE wxLogStream : public wxLog { public: // redirect log output to an ostream wxLogStream(wxSTD ostream *ostr = (wxSTD ostream *) NULL); protected: // implement sink function virtual void DoLogString(const wxChar *szString, time_t t); // using ptr here to avoid including from this file wxSTD ostream *m_ostr; }; #endif // wxUSE_STD_IOSTREAM // ---------------------------------------------------------------------------- // /dev/null log target: suppress logging until this object goes out of scope // ---------------------------------------------------------------------------- // example of usage: /* void Foo() { 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 } */ class WXDLLIMPEXP_BASE wxLogNull { public: wxLogNull() : m_flagOld(wxLog::EnableLogging(FALSE)) { } ~wxLogNull() { (void)wxLog::EnableLogging(m_flagOld); } private: bool m_flagOld; // the previous value of the wxLog::ms_doLog }; // ---------------------------------------------------------------------------- // chaining log target: installs itself as a log target and passes all // messages to the real log target given to it in the ctor but also forwards // them to the previously active one // // note that you don't have to call SetActiveTarget() with this class, it // does it itself in its ctor // ---------------------------------------------------------------------------- class WXDLLIMPEXP_BASE wxLogChain : public wxLog { public: wxLogChain(wxLog *logger); virtual ~wxLogChain(); // change the new log target void SetLog(wxLog *logger); // this can be used to temporarily disable (and then reenable) passing // messages to the old logger (by default we do pass them) void PassMessages(bool bDoPass) { m_bPassMessages = bDoPass; } // are we passing the messages to the previous log target? bool IsPassingMessages() const { return m_bPassMessages; } // return the previous log target (may be NULL) wxLog *GetOldLog() const { return m_logOld; } // override base class version to flush the old logger as well virtual void Flush(); protected: // pass the chain to the old logger if needed virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t); private: // the current log target wxLog *m_logNew; // the previous log target wxLog *m_logOld; // do we pass the messages to the old logger? bool m_bPassMessages; DECLARE_NO_COPY_CLASS(wxLogChain) }; // a chain log target which uses itself as the new logger class WXDLLIMPEXP_BASE wxLogPassThrough : public wxLogChain { public: wxLogPassThrough(); private: DECLARE_NO_COPY_CLASS(wxLogPassThrough) }; #if wxUSE_GUI // include GUI log targets: #include "wx/generic/logg.h" #endif // wxUSE_GUI // ============================================================================ // global functions // ============================================================================ // ---------------------------------------------------------------------------- // Log functions should be used by application instead of stdio, iostream &c // for log messages for easy redirection // ---------------------------------------------------------------------------- // ---------------------------------------------------------------------------- // get error code/error message from system in a portable way // ---------------------------------------------------------------------------- // return the last system error code WXDLLIMPEXP_BASE unsigned long wxSysErrorCode(); // return the error message for given (or last if 0) error code WXDLLIMPEXP_BASE const wxChar* wxSysErrorMsg(unsigned long nErrCode = 0); // ---------------------------------------------------------------------------- // define wxLog // ---------------------------------------------------------------------------- #define DECLARE_LOG_FUNCTION(level) \ extern void WXDLLIMPEXP_BASE wxVLog##level(const wxChar *szFormat, \ va_list argptr); \ extern void WXDLLIMPEXP_BASE wxLog##level(const wxChar *szFormat, \ ...) ATTRIBUTE_PRINTF_1 #define DECLARE_LOG_FUNCTION2_EXP(level, arg, expdecl) \ extern void expdecl wxVLog##level(arg, const wxChar *szFormat, \ va_list argptr); \ extern void expdecl wxLog##level(arg, const wxChar *szFormat, \ ...) ATTRIBUTE_PRINTF_2 #define DECLARE_LOG_FUNCTION2(level, arg) \ DECLARE_LOG_FUNCTION2_EXP(level, arg, WXDLLIMPEXP_BASE) #else // !wxUSE_LOG // log functions do nothing at all #define DECLARE_LOG_FUNCTION(level) \ inline void wxVLog##level(const wxChar *szFormat, \ va_list argptr) { } \ inline void wxLog##level(const wxChar *szFormat, ...) { } #define DECLARE_LOG_FUNCTION2(level, arg) \ inline void wxVLog##level(arg, const wxChar *szFormat, \ va_list argptr) {} \ inline void wxLog##level(arg, const wxChar *szFormat, ...) { } // Empty Class to fake wxLogNull class WXDLLIMPEXP_BASE wxLogNull { public: wxLogNull() { } }; // Dummy macros to replace some functions. #define wxSysErrorCode() (unsigned long)0 #define wxSysErrorMsg( X ) (const wxChar*)NULL // Fake symbolic trace masks... for those that are used frequently #define wxTRACE_OleCalls wxEmptyString // OLE interface calls #endif // wxUSE_LOG/!wxUSE_LOG // a generic function for all levels (level is passes as parameter) DECLARE_LOG_FUNCTION2(Generic, wxLogLevel level); // one function per each level DECLARE_LOG_FUNCTION(FatalError); DECLARE_LOG_FUNCTION(Error); DECLARE_LOG_FUNCTION(Warning); DECLARE_LOG_FUNCTION(Message); DECLARE_LOG_FUNCTION(Info); DECLARE_LOG_FUNCTION(Verbose); // this function sends the log message to the status line of the top level // application frame, if any DECLARE_LOG_FUNCTION(Status); #if wxUSE_GUI // this one is the same as previous except that it allows to explicitly // specify the frame to which the output should go DECLARE_LOG_FUNCTION2_EXP(Status, wxFrame *pFrame, WXDLLIMPEXP_CORE); #endif // wxUSE_GUI // additional one: as wxLogError, but also logs last system call error code // and the corresponding error message if available DECLARE_LOG_FUNCTION(SysError); // and another one which also takes the error code (for those broken APIs // that don't set the errno (like registry APIs in Win32)) DECLARE_LOG_FUNCTION2(SysError, long lErrCode); // debug functions do nothing in release mode #if wxUSE_LOG_DEBUG DECLARE_LOG_FUNCTION(Debug); // first kind of LogTrace is unconditional: it doesn't check the level, DECLARE_LOG_FUNCTION(Trace); // this second version will only log the message if the mask had been // added to the list of masks with AddTraceMask() DECLARE_LOG_FUNCTION2(Trace, const wxChar *mask); // the last one does nothing if all of level bits are not set // in wxLog::GetActive()->GetTraceMask() - it's deprecated in favour of // string identifiers DECLARE_LOG_FUNCTION2(Trace, wxTraceMask mask); #else //!debug // these functions do nothing in release builds inline void wxVLogDebug(const wxChar *, va_list) { } inline void wxLogDebug(const wxChar *, ...) { } inline void wxVLogTrace(const wxChar *, va_list) { } inline void wxLogTrace(const wxChar *, ...) { } inline void wxVLogTrace(wxTraceMask, const wxChar *, va_list) { } inline void wxLogTrace(wxTraceMask, const wxChar *, ...) { } inline void wxVLogTrace(const wxChar *, const wxChar *, va_list) { } inline void wxLogTrace(const wxChar *, const wxChar *, ...) { } #endif // debug/!debug // wxLogFatalError helper: show the (fatal) error to the user in a safe way, // i.e. without using wxMessageBox() for example because it could crash void WXDLLIMPEXP_BASE wxSafeShowMessage(const wxString& title, const wxString& text); // ---------------------------------------------------------------------------- // debug only logging functions: use them with API name and error code // ---------------------------------------------------------------------------- #ifdef __WXDEBUG__ // make life easier for people using VC++ IDE: clicking on the message // will take us immediately to the place of the failed API #ifdef __VISUALC__ #define wxLogApiError(api, rc) \ wxLogDebug(wxT("%s(%d): '%s' failed with error 0x%08lx (%s)."), \ __TFILE__, __LINE__, api, \ (long)rc, wxSysErrorMsg(rc)) #else // !VC++ #define wxLogApiError(api, rc) \ wxLogDebug(wxT("In file %s at line %d: '%s' failed with ") \ wxT("error 0x%08lx (%s)."), \ __TFILE__, __LINE__, api, \ (long)rc, wxSysErrorMsg(rc)) #endif // VC++/!VC++ #define wxLogLastError(api) wxLogApiError(api, wxSysErrorCode()) #else //!debug inline void wxLogApiError(const wxChar *, long) { } inline void wxLogLastError(const wxChar *) { } #endif //debug/!debug #endif // _WX_LOG_H_