use LLONG_MIN instead of -1 (which is a valid time value corresponding to 1ms before...

[wxWidgets.git] / include / wx / log.h

diff --git a/include/wx/log.h b/include/wx/log.h
index 944df18f394b90294b3d2c1ae50eda8316f49ce0..164bdfca90c5b9da37afe674ff0159adda24f6ba 100644 (file)
--- a/include/wx/log.h
+++ b/include/wx/log.h
@@ -1,39 +1,25 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        log.h
+// 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 <zeitlin@dptmaths.ens-cachan.fr>
 // 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 <zeitlin@dptmaths.ens-cachan.fr>

-// Licence:     wxWindows license
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

-#ifndef   _WX_LOG_H_
-#define   _WX_LOG_H_
+#ifndef _WX_LOG_H_
+#define _WX_LOG_H_

 
 

-#ifdef    __GNUG__
-#pragma interface "log.h"
-#endif
+#include "wx/defs.h"

 
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------

-// constants
+// common constants for use in wxUSE_LOG/!wxUSE_LOG

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-// 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_Info,       // informational message (a.k.a. 'Verbose')
-  wxLOG_Status,     // informational: might go to the status line of GUI app
-  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
-};
+// 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)
 
 // meaning of different bits of the trace mask (which allows selectively
 // enable/disable some trace messages)


@@ -43,247 +29,424 @@ enum
 #define wxTraceRefCount 0x0008  // trace various ref counting operations
 
 #ifdef  __WXMSW__
 #define wxTraceRefCount 0x0008  // trace various ref counting operations
 
 #ifdef  __WXMSW__

-  #define wxTraceOleCalls 0x0100  // OLE interface calls
+    #define wxTraceOleCalls 0x0100  // OLE interface calls

 #endif
 
 #endif
 

+// ----------------------------------------------------------------------------
+// types
+// ----------------------------------------------------------------------------
+
+// NB: these types are needed even if wxUSE_LOG == 0

 typedef unsigned long wxTraceMask;
 typedef unsigned long wxLogLevel;
 
 typedef unsigned long wxTraceMask;
 typedef unsigned long wxLogLevel;
 

+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+#include "wx/string.h"
+
+#if wxUSE_LOG
+
+#include "wx/arrstr.h"
+
+#ifndef __WXWINCE__
+    #include <time.h>   // 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
+

 // ----------------------------------------------------------------------------
 // forward declarations
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // forward declarations
 // ----------------------------------------------------------------------------

-class wxTextCtrl;
-class wxLogFrame;
-class wxFrame;
-class ostream;
+
+#if wxUSE_GUI
+    class WXDLLIMPEXP_CORE wxTextCtrl;
+    class WXDLLIMPEXP_CORE wxLogFrame;
+    class WXDLLIMPEXP_CORE wxFrame;
+    class WXDLLIMPEXP_CORE wxWindow;
+#endif // wxUSE_GUI
+
+// ----------------------------------------------------------------------------
+// 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
+
+#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
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 // 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 WXDLLEXPORT wxLog
+
+class WXDLLIMPEXP_BASE wxLog

 {
 public:
 {
 public:

-  // ctor
-  wxLog();
-
-  // sink function
-  static void OnLog(wxLogLevel level, const char *szString)
-    { if ( ms_pLogger != 0 ) ms_pLogger->DoLog(level, szString); }
-
-  // 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();
-    // call to Flush() may be optimized: call it only if this function
-    // returns true (although Flush() also returns immediately if there
-    // is no messages, this functions is more efficient because inline)
-  bool HasPendingMessages() const { return m_bHasMessages; }
-
-  // only one sink is active at each moment
-    // get current log target, will call wxApp::CreateLogTarget() to create one
-    // if 
-  static wxLog *GetActiveTarget();
-    // change log target, pLogger = NULL disables logging. if bNoFlashOld is true, 
-    // the old log target isn't flashed which might lead to loss of messages!
-    // returns the previous log target
-  static wxLog *SetActiveTarget(wxLog *pLogger, bool bNoFlashOld = FALSE);
-
-  // functions controlling the default wxLog behaviour
-    // verbose mode is activated by standard command-line '-verbose' option
-  void SetVerbose(bool bVerbose = TRUE) { m_bVerbose = bVerbose; }
-    // sets the format for timestamp prepended by wxLog::DoLog(): it's
-    // passed to strftime() function, see it's documentation for details.
-    // no time stamp at all if szTF is NULL or empty
-    // NB: the string is not copied, so it's lifetime must be long enough!
-  void SetTimeStampFormat(const char *szTF) { m_szTimeFormat = szTF; }
+    // ctor
+    wxLog(){}
+
+    // 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);
+
+    // 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();
+
+    // log the count of repeating messages instead of logging the messages
+    // multiple times
+    static void SetRepetitionCounting(bool bRepetCounting = true)
+        { ms_bRepetCounting = bRepetCounting; }
+
+    // gets duplicate counting status
+    static bool GetRepetitionCounting() { return ms_bRepetCounting; }
+

     // trace mask (see wxTraceXXX constants for details)
     // trace mask (see wxTraceXXX constants for details)

-  static void SetTraceMask(wxTraceMask ulMask) { ms_ulTraceMask = ulMask; }
-    // should GetActiveTarget() try to create a new log object if the current
-    // is NULL?
-  static void DontCreateOnDemand() { ms_bAutoCreate = FALSE; }
+    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

 
 

-  // accessors

     // gets the verbose status
     // gets the verbose status

-  bool GetVerbose() const { return m_bVerbose; }
-    // get current time format
-  const char *GetTimeStampFormat() const { return m_szTimeFormat; }
+    static bool GetVerbose() { return ms_bVerbose; }
+

     // get trace mask
     // get trace mask

-  static wxTraceMask GetTraceMask() { return ms_ulTraceMask; }
+    static wxTraceMask GetTraceMask() { return ms_ulTraceMask; }

 
 

-  // make dtor virtual for all derived classes
-  virtual ~wxLog() { }
+    // 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();

 
 

-protected:
-  bool m_bHasMessages;

 
 

-  bool          m_bVerbose;     // FALSE => ignore LogInfo messages
-  const char   *m_szTimeFormat; // format for strftime()
+    // this method exists for backwards compatibility only, don't use
+    bool HasPendingMessages() const { return true; }
+
+#if WXWIN_COMPATIBILITY_2_6
+    // this function doesn't do anything any more, don't call it
+    wxDEPRECATED( static wxChar *SetLogBuffer(wxChar *buf, size_t size = 0) );
+#endif
+
+protected:
+    // the logging functions that can be overriden

 
 

-  // 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()
     // 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 char *szString);
+    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
     // 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 char *szString);
+    virtual void DoLogString(const wxChar *szString, time_t t);

 
 

-  // helpers
-    // put the time stamp in the current format into the string
-  wxString TimeStamp() const;
+    // log a line containing the number of times the previous message was
+    // repeated
+    // returns: the number
+    static unsigned DoLogNumberOfRepeats();

 
 private:
 
 private:

-  // static variables
-  // ----------------
-  static wxLog      *ms_pLogger;      // currently active log sink
-  static bool        ms_bAutoCreate;  // automatically create new log targets?
-  static wxTraceMask ms_ulTraceMask;  // controls wxLogTrace behaviour
+    // static variables
+    // ----------------
+
+    // traditional behaviour or counting repetitions
+    static bool        ms_bRepetCounting;
+    static wxString    ms_prevString;   // previous message that was logged
+    // how many times the previous message was logged
+    static unsigned    ms_prevCounter;
+    static time_t      ms_prevTimeStamp;// timestamp of the previous message
+    static wxLogLevel  ms_prevLevel;    // level of the previous message
+
+    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
 // ----------------------------------------------------------------------------
 
 };
 
 // ----------------------------------------------------------------------------
 // "trivial" derivations of wxLog
 // ----------------------------------------------------------------------------
 

-// log everything to a "FILE *", stderr by default
-class WXDLLEXPORT wxLogStderr : public wxLog
+// log everything to a buffer
+class WXDLLIMPEXP_BASE wxLogBuffer : public wxLog

 {
 public:
 {
 public:

-  // redirect log output to a FILE
-  wxLogStderr(FILE *fp = (FILE *) NULL);
+    wxLogBuffer() { }
+
+    // get the string contents with all messages logged
+    const wxString& GetBuffer() const { return m_str; }
+
+    // show the buffer contents to the user in the best possible way (this uses
+    // wxMessageOutputMessageBox) and clear it
+    virtual void Flush();
+
+protected:
+    virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t);
+    virtual void DoLogString(const wxChar *szString, time_t t);

 
 private:
 
 private:

-  // implement sink function
-  virtual void DoLogString(const char *szString);
+    wxString m_str;

 
 

-  FILE *m_fp;
+    DECLARE_NO_COPY_CLASS(wxLogBuffer)

 };
 
 };
 

-// log everything to an "ostream", cerr by default
-class ostream;
-class WXDLLEXPORT wxLogStream : public wxLog
+
+// log everything to a "FILE *", stderr by default
+class WXDLLIMPEXP_BASE wxLogStderr : public wxLog

 {
 public:
 {
 public:

-  // redirect log output to an ostream
-  wxLogStream(ostream *ostr = (ostream *) NULL);
+    // redirect log output to a FILE
+    wxLogStderr(FILE *fp = (FILE *) NULL);

 
 protected:
 
 protected:

-  // implement sink function
-  virtual void DoLogString(const char *szString);
+    // implement sink function
+    virtual void DoLogString(const wxChar *szString, time_t t);

 
 

-  // @@ using ptr here to avoid including <iostream.h> from this file
-  ostream *m_ostr;
+    FILE *m_fp;
+
+    DECLARE_NO_COPY_CLASS(wxLogStderr)

 };
 
 };
 

-// log everything to a text window (GUI only of course)
-class WXDLLEXPORT wxLogTextCtrl : public wxLogStream
+#if wxUSE_STD_IOSTREAM
+
+// log everything to an "ostream", cerr by default
+class WXDLLIMPEXP_BASE wxLogStream : public wxLog

 {
 public:
 {
 public:

-  // we just create an ostream from wxTextCtrl and use it in base class
-  wxLogTextCtrl(wxTextCtrl *pTextCtrl);
- ~wxLogTextCtrl();
+    // 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 <iostream.h> from this file
+    wxSTD ostream *m_ostr;

 };
 
 };
 

+#endif // wxUSE_STD_IOSTREAM
+

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-// GUI log target, the default one for wxWindows programs
+// /dev/null log target: suppress logging until this object goes out of scope

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-class WXDLLEXPORT wxLogGui : public wxLog
-{
-public:
-  // ctor
-  wxLogGui();

 
 

-  // show all messages that were logged since the last Flush()
-  virtual void Flush();
+// example of usage:
+/*
+    void Foo()
+    {
+        wxFile file;

 
 

-protected:
-  virtual void DoLog(wxLogLevel level, const char *szString);
+        // 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); }

 
 

-  wxArrayString m_aMessages;
-  bool          m_bErrors;
+private:
+    bool m_flagOld; // the previous value of the wxLog::ms_doLog

 };
 
 // ----------------------------------------------------------------------------
 };
 
 // ----------------------------------------------------------------------------

-// (background) log window: this class forwards all log messages to the log
-// target which was active when it was instantiated, but also collects them
-// to the log window. This window has it's own menu which allows the user to
-// close it, clear the log contents or save it to the file.
+// 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 WXDLLEXPORT wxLogWindow : public wxLog
+
+class WXDLLIMPEXP_BASE wxLogChain : public wxLog

 {
 public:
 {
 public:

-  wxLogWindow(wxFrame *pParent,         // the parent frame (can be NULL)
-              const char *szTitle,      // the title of the frame
-              bool bShow = TRUE,        // show window immediately?
-              bool bPassToOld = TRUE);  // pass log messages to the old target?
-  ~wxLogWindow();
-
-  // window operations
-    // show/hide the log window
-  void Show(bool bShow = TRUE);
-    // retrieve the pointer to the frame
-  wxFrame *GetFrame() const;
-
-  // accessors
-    // the previous log target (may be NULL)
-  wxLog *GetOldLog() const { return m_pOldLog; }
-    // are we passing the messages to the previous log target?
-  bool IsPassingMessages() const { return m_bPassMessages; }
+    wxLogChain(wxLog *logger);
+    virtual ~wxLogChain();

 
 

-  // we can pass the messages to the previous log target (we're in this mode by
-  // default: we collect all messages in the window, but also let the default
-  // processing take place)
-  void PassMessages(bool bDoPass) { m_bPassMessages = bDoPass; }
+    // change the new log target
+    void SetLog(wxLog *logger);

 
 

-  // base class virtuals
-    // we don't need it ourselves, but we pass it to the previous logger
-  virtual void Flush();
+    // 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; }

 
 

-  // overridables
-    // 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
-  virtual void OnFrameDelete(wxFrame *frame);
+    // 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:
 
 protected:

-  virtual void DoLog(wxLogLevel level, const char *szString);
-  virtual void DoLogString(const char *szString);
+    // pass the chain to the old logger if needed
+    virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t);

 
 private:
 
 private:

-  bool        m_bPassMessages;  // pass messages to m_pOldLog?
-  wxLog      *m_pOldLog;        // previous log target
-  wxLogFrame *m_pLogFrame;      // the log frame
-};
+    // the current log target
+    wxLog *m_logNew;

 
 

-// ----------------------------------------------------------------------------
-// /dev/null log target: suppress logging until this object goes out of scope
-// ----------------------------------------------------------------------------
+    // the previous log target
+    wxLog *m_logOld;

 
 

-// 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 WXDLLEXPORT wxLogNull
+    // 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:
 {
 public:

-  // ctor saves old log target, dtor restores it
-  wxLogNull() { m_pPrevLogger = wxLog::SetActiveTarget((wxLog *)NULL, TRUE); }
- ~wxLogNull() { (void)wxLog::SetActiveTarget(m_pPrevLogger);  }
+    wxLogPassThrough();

 
 private:
 
 private:

-  wxLog *m_pPrevLogger; // old log target
+    DECLARE_NO_COPY_CLASS(wxLogPassThrough)

 };
 
 };
 

+#if wxUSE_GUI
+    // include GUI log targets:
+    #include "wx/generic/logg.h"
+#endif // wxUSE_GUI
+

 // ============================================================================
 // global functions
 // ============================================================================
 // ============================================================================
 // global functions
 // ============================================================================


@@ -293,16 +456,70 @@ private:
 // for log messages for easy redirection
 // ----------------------------------------------------------------------------
 
 // 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<level>
 // define wxLog<level>

-// -------------------
+// ----------------------------------------------------------------------------
+
+#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, argclass, arg, expdecl)            \
+extern void expdecl wxVLog##level(argclass arg,                             \
+                                  const wxChar *szFormat,                   \
+                                  va_list argptr);                          \
+extern void expdecl wxLog##level(argclass arg,                              \
+                                 const wxChar *szFormat,                    \
+                                 ...) ATTRIBUTE_PRINTF_2
+#else // !wxUSE_LOG
+
+// log functions do nothing at all
+#define DECLARE_LOG_FUNCTION(level)                                         \
+inline void wxVLog##level(const wxChar *WXUNUSED(szFormat),                 \
+                          va_list WXUNUSED(argptr)) { }                     \
+inline void wxLog##level(const wxChar *WXUNUSED(szFormat),                  \
+                         ...) { }
+#define DECLARE_LOG_FUNCTION2_EXP(level, argclass, arg, expdecl)            \
+inline void wxVLog##level(argclass WXUNUSED(arg),                           \
+                          const wxChar *WXUNUSED(szFormat),                 \
+                          va_list WXUNUSED(argptr)) {}                      \
+inline void wxLog##level(argclass WXUNUSED(arg),                            \
+                         const wxChar *WXUNUSED(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
+
+#define DECLARE_LOG_FUNCTION2(level, argclass, arg)                         \
+    DECLARE_LOG_FUNCTION2_EXP(level, argclass, arg, WXDLLIMPEXP_BASE)

 
 

-#define DECLARE_LOG_FUNCTION(level)                                 \
-        extern void WXDLLEXPORT wxLog##level(const char *szFormat, ...)
-#define DECLARE_LOG_FUNCTION2(level, arg1)                          \
-        extern void WXDLLEXPORT wxLog##level(arg1, const char *szFormat, ...)

 
 // a generic function for all levels (level is passes as parameter)
 
 // a generic function for all levels (level is passes as parameter)

-DECLARE_LOG_FUNCTION2(Generic, wxLogLevel level);
+DECLARE_LOG_FUNCTION2(Generic, wxLogLevel, level);

 
 // one function per each level
 DECLARE_LOG_FUNCTION(FatalError);
 
 // one function per each level
 DECLARE_LOG_FUNCTION(FatalError);


@@ -316,9 +533,12 @@ DECLARE_LOG_FUNCTION(Verbose);
 // application frame, if any
 DECLARE_LOG_FUNCTION(Status);
 
 // application frame, if any
 DECLARE_LOG_FUNCTION(Status);
 

-// 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(Status, wxFrame *pFrame);
+#if wxUSE_GUI
+    // this one is the same as previous except that it allows to explicitly
+    class WXDLLEXPORT wxFrame;
+    // 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
 
 // additional one: as wxLogError, but also logs last system call error code
 // and the corresponding error message if available


@@ -326,56 +546,90 @@ 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))
 
 // 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);
+DECLARE_LOG_FUNCTION2(SysError, long, lErrCode);

 
 // debug functions do nothing in release mode
 
 // debug functions do nothing in release mode

-#ifdef  __WXDEBUG__
-  DECLARE_LOG_FUNCTION(Debug);
-
-  // first king of LogTrace is uncoditional: it doesn't check the level,
-  // while the second one does nothing if all of level bits are not set
-  // in wxLog::GetActive()->GetTraceMask().
-  DECLARE_LOG_FUNCTION(Trace);
-  DECLARE_LOG_FUNCTION2(Trace, wxTraceMask mask);
-#else   //!debug
-  // these functions do nothing
-  inline void wxLogDebug(const char *, ...) { }
-  inline void wxLogTrace(const char *, ...) { }
-  inline void wxLogTrace(wxTraceMask, const char *, ...) { }
-#endif
-
-
-// are we in 'verbose' mode?
-// (note that it's often handy to change this var manually from the
-//  debugger, thus enabling/disabling verbose reporting for some
-//  parts of the program only)
-WXDLLEXPORT_DATA(extern bool) g_bVerbose;
-
-// fwd decl to avoid including iostream.h here
-class ostream;
-
-// ----------------------------------------------------------------------------
-// get error code/error message from system in a portable way
-// ----------------------------------------------------------------------------
-
-// return the last system error code
-unsigned long WXDLLEXPORT wxSysErrorCode();
-// return the error message for given (or last if 0) error code
-const char* WXDLLEXPORT wxSysErrorMsg(unsigned long nErrCode = 0);
+#if wxUSE_LOG && wxUSE_LOG_DEBUG
+    DECLARE_LOG_FUNCTION(Debug);
+
+    // there is no more unconditional LogTrace: it is not different from
+    // LogDebug and it creates overload ambiguities
+    //DECLARE_LOG_FUNCTION(Trace);
+
+    // this version only logs the message if the mask had been added to the
+    // list of masks with AddTraceMask()
+    DECLARE_LOG_FUNCTION2(Trace, const wxChar *, mask);
+
+    // and this 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 || !wxUSE_LOG
+    // these functions do nothing in release builds, but don't define them as
+    // nothing as it could result in different code structure in debug and
+    // release and this could result in trouble when these macros are used
+    // inside if/else
+    //
+    // note that making wxVLogDebug/Trace() themselves (empty inline) functions
+    // is a bad idea as some compilers are stupid enough to not inline even
+    // empty functions if their parameters are complicated enough, but by
+    // defining them as an empty inline function we ensure that even dumbest
+    // compilers optimise them away
+    inline void wxLogNop() { }
+
+    #define wxVLogDebug(fmt, valist) wxLogNop()
+    #define wxVLogTrace(mask, fmt, valist) wxLogNop()
+
+    #ifdef HAVE_VARIADIC_MACROS
+        // unlike the inline functions below, this completely removes the
+        // wxLogXXX calls from the object file:
+        #define wxLogDebug(fmt, ...) wxLogNop()
+        #define wxLogTrace(mask, fmt, ...) wxLogNop()
+    #else // !HAVE_VARIADIC_MACROS
+        // note that leaving out "fmt" in the vararg functions provokes a warning
+        // from SGI CC: "the last argument of the varargs function is unnamed"
+        inline void wxLogDebug(const wxChar *fmt, ...) { wxUnusedVar(fmt); }
+        inline void wxLogTrace(wxTraceMask, const wxChar *fmt, ...) { wxUnusedVar(fmt); }
+        inline void wxLogTrace(const wxChar *, const wxChar *fmt, ...) { wxUnusedVar(fmt); }
+    #endif // HAVE_VARIADIC_MACROS/!HAVE_VARIADIC_MACROS
+#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
 // ----------------------------------------------------------------------------
 
 
 // ----------------------------------------------------------------------------
 // debug only logging functions: use them with API name and error code
 // ----------------------------------------------------------------------------
 

-#ifdef  __WXDEBUG__
-  #define wxLogApiError(api, rc)                                              \
-                    wxLogDebug("At %s(%d) '%s' failed with error %lx (%s).",  \
-                               __FILE__, __LINE__, api,                       \
-                               rc, wxSysErrorMsg(rc))
-  #define wxLogLastError(api) wxLogApiError(api, wxSysErrorCode())
+#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
 #else   //!debug

-  inline void wxLogApiError(const char *, long) { }
-  inline void wxLogLastError(const char *) { }
+    #define wxLogApiError(api, err) wxLogNop()
+    #define wxLogLastError(api) wxLogNop()

 #endif  //debug/!debug
 
 #endif  //debug/!debug
 

+// wxCocoa has additiional trace masks
+#if defined(__WXCOCOA__)
+#include "wx/cocoa/log.h"
+#endif
+

 #endif  // _WX_LOG_H_
 #endif  // _WX_LOG_H_

+