Better fix

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

diff --git a/include/wx/log.h b/include/wx/log.h
index 7a3fd73d9e1fd71016fdc480bff4ceed29b85499..4d9523604271ef8422f6d77a1c594350411e4b3e 100644 (file)
--- a/include/wx/log.h
+++ b/include/wx/log.h
@@ -1,196 +1,537 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// 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   __LOGH__
-#define   __LOGH__
+#ifndef _WX_LOG_H_
+#define _WX_LOG_H_

 
 

-#ifdef    __GNUG__
-#pragma interface "log.h"
-#endif  //GNU C++
+#include "wx/defs.h"
+
+#if wxUSE_THREADS
+    class WXDLLIMPEXP_FWD_BASE wxCriticalSection;
+#endif
+
+// ----------------------------------------------------------------------------
+// common constants for use in wxUSE_LOG/!wxUSE_LOG
+// ----------------------------------------------------------------------------
+
+// the trace masks have been superceded by symbolic trace constants, they're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
+
+// ----------------------------------------------------------------------------
+// types
+// ----------------------------------------------------------------------------
+
+// NB: these types are needed even if wxUSE_LOG == 0
+typedef unsigned long wxTraceMask;
+typedef unsigned long wxLogLevel;
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+#include "wx/string.h"
+#include "wx/strvararg.h"
+
+#if wxUSE_LOG
+
+#include "wx/arrstr.h"
+
+#ifndef __WXPALMOS5__
+#ifndef __WXWINCE__
+    #include <time.h>   // for time_t
+#endif
+#endif // ! __WXPALMOS5__
+
+#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
+// ----------------------------------------------------------------------------
+
+#if wxUSE_GUI
+    class WXDLLIMPEXP_FWD_CORE wxTextCtrl;
+    class WXDLLIMPEXP_FWD_CORE wxLogFrame;
+    class WXDLLIMPEXP_FWD_CORE wxFrame;
+    class WXDLLIMPEXP_FWD_CORE wxWindow;
+#endif // wxUSE_GUI
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// different standard log levels (you may also define your own)
+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
+};
+
+// 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

-//
-// ## would ne nice to add a time stamp to log messages

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

-class WXDLLEXPORT wxLog
+
+class WXDLLIMPEXP_BASE wxLog

 {
 public:
 {
 public:

-  enum Level
-  {
-    FatalError, // program can't continue, abort immediately
-    Error,      // a serious error, user must be informed about it
-    Warning,    // warning: user is normally informed about but may ignore it
-    Message,    // normal message (i.e. normal output of a non GUI app)
-    Info,       // informational message (a.k.a. 'Verbose')
-    Status,     // informational: might go to the status line of GUI app
-    Debug,      // never shown to the user, disabled in release mode
-    Trace,      // trace messages are also only enabled in debug mode
-    Progress,   // used for progress indicator (not yet)
-    User1,      // user defined levels (use with wxLogGeneric(wxLog::User1,...)
-    User2,      //
-    User3,      //
-  };
-
-  // ctor
-  wxLog();
-
-  // sink function
-  static void OnLog(Level 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 Flush() only if this function returns true
-  bool HasPendingMessages() const { return m_bHasMessages; }
-
-  // only one sink is active at each moment
-    // get current log target
-  static wxLog *GetActiveTarget();
-    // change log target, pLogger = NULL disables logging,
-    // returns the previous log target
-  static wxLog *SetActiveTarget(wxLog *pLogger);
-
-  // 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; }
-    // sets the format for timestamp prepended by wxLog::DoLog(): it's
-    // passed to strftime() function, see it's documentation for details.
-    // the string is not copied!
-  static void SetTimeStampFormat(const char *szTimeFormat)
-    { ms_szTimeFormat = szTimeFormat; }
-
-  // accessors
+    // 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 wxString& 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();
+
+    // Make GetActiveTarget() create a new log object again.
+    static void DoCreateOnDemand();
+
+    // 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)
+    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 time stamp string format: this is used as strftime() format
+    // string for the log targets which add time stamps to the messages; set
+    // it to empty string to disable time stamping completely.
+    static void SetTimestamp(const wxString& ts) { ms_timestamp = ts; }
+
+    // disable time stamping of log messages
+    static void DisableTimestamp() { SetTimestamp(wxEmptyString); }
+
+
+    // accessors
+

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

-  static bool GetVerbose() { return ms_bVerbose; }
+    static bool GetVerbose() { return ms_bVerbose; }

 
 

-  // make dtor virtual for all derived classes
-  virtual ~wxLog() { }
+    // get trace mask
+    static wxTraceMask GetTraceMask() { return ms_ulTraceMask; }

 
 

-protected:
-  bool m_bHasMessages;
+    // is this trace mask in the list?
+    static bool IsAllowedTraceMask(const wxString& mask);

 
 

-  // static variables
-  // ----------------
-  static bool        ms_bVerbose;     // FALSE => ignore LogInfo messages
-  static const char *ms_szTimeFormat; // format for strftime()
+    // return the current loglevel limit
+    static wxLogLevel GetLogLevel() { return ms_logLevel; }
+
+    // get the current timestamp format string (may be NULL)
+    static const wxString& 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; }
+
+#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

 
 

-private:
-  // 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(Level level, const char *szString);
+    virtual void DoLog(wxLogLevel level, const wxString& szString, time_t t);
+#if WXWIN_COMPATIBILITY_2_8
+    // these shouldn't be used by new code
+    wxDEPRECATED_BUT_USED_INTERNALLY(
+        virtual void DoLog(wxLogLevel level, const char *szString, time_t t)
+    );
+
+    wxDEPRECATED_BUT_USED_INTERNALLY(
+        virtual void DoLog(wxLogLevel level, const wchar_t *wzString, time_t t)
+    );
+#endif // WXWIN_COMPATIBILITY_2_8
+
+    void LogString(const wxString& szString, time_t t)
+        { DoLogString(szString, 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);
-  
-  static wxLog *ms_pLogger;       // currently active log sink
-  static bool   ms_bInitialized;  // any log targets created?
+    virtual void DoLogString(const wxString& szString, time_t t);
+#if WXWIN_COMPATIBILITY_2_8
+    // these shouldn't be used by new code
+    virtual void DoLogString(const char *WXUNUSED(szString),
+                             time_t WXUNUSED(t)) {}
+    virtual void DoLogString(const wchar_t *WXUNUSED(szString),
+                             time_t WXUNUSED(t)) {}
+#endif // WXWIN_COMPATIBILITY_2_8
+
+    // this macro should be used in the derived classes to avoid warnings about
+    // hiding the other DoLog() overloads when overriding DoLog(wxString) --
+    // but don't use it with MSVC which doesn't give this warning but does give
+    // warning when a deprecated function is overridden
+#if WXWIN_COMPATIBILITY_2_8 && !defined(__VISUALC__)
+    #define wxSUPPRESS_DOLOG_HIDE_WARNING()                                   \
+        virtual void DoLog(wxLogLevel, const char *, time_t) { }              \
+        virtual void DoLog(wxLogLevel, const wchar_t *, time_t) { }
+
+    #define wxSUPPRESS_DOLOGSTRING_HIDE_WARNING()                             \
+        virtual void DoLogString(const char *, time_t) { }                    \
+        virtual void DoLogString(const wchar_t *, time_t) { }
+#else
+    #define wxSUPPRESS_DOLOG_HIDE_WARNING()
+    #define wxSUPPRESS_DOLOGSTRING_HIDE_WARNING()
+#endif
+
+    // log a message indicating the number of times the previous message was
+    // repeated if ms_prevCounter > 0, does nothing otherwise; return the old
+    // value of ms_prevCounter
+    unsigned LogLastRepeatIfNeeded();
+
+private:
+    // implement of LogLastRepeatIfNeeded(): it assumes that the
+    // caller had already locked ms_prevCS
+    unsigned LogLastRepeatIfNeededUnlocked();
+
+    // static variables
+    // ----------------
+
+    // if true, don't log the same message multiple times, only log it once
+    // with the number of times it was repeated
+    static bool        ms_bRepetCounting;
+
+#if wxUSE_THREADS
+    static wxCriticalSection ms_prevCS; // protects the ms_prev values below
+#endif
+    static wxString    ms_prevString;   // previous message that was logged
+    static unsigned    ms_prevCounter;  // how many times it was repeated
+    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 wxString    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 = 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 wxString& szString, time_t t);
+    virtual void DoLogString(const wxString& szString, time_t t);
+
+    wxSUPPRESS_DOLOG_HIDE_WARNING()
+    wxSUPPRESS_DOLOGSTRING_HIDE_WARNING()

 
 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 a "FILE *", stderr by default
+class WXDLLIMPEXP_BASE wxLogStderr : public wxLog
+{
+public:
+    // redirect log output to a FILE
+    wxLogStderr(FILE *fp = (FILE *) NULL);
+
+protected:
+    // implement sink function
+    virtual void DoLogString(const wxString& szString, time_t t);
+
+    wxSUPPRESS_DOLOGSTRING_HIDE_WARNING()
+
+    FILE *m_fp;
+
+    DECLARE_NO_COPY_CLASS(wxLogStderr)
+};
+
+#if wxUSE_STD_IOSTREAM
+

 // log everything to an "ostream", cerr by default
 // log everything to an "ostream", cerr by default

-class WXDLLEXPORT wxLogStream : public wxLog
+class WXDLLIMPEXP_BASE wxLogStream : public wxLog

 {
 public:
 {
 public:

-  // redirect log output to an ostream
-  wxLogStream(ostream *ostr = NULL);
+    // redirect log output to an ostream
+    wxLogStream(wxSTD ostream *ostr = (wxSTD ostream *) NULL);

 
 protected:
 
 protected:

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

 
 

-  // @@ using ptr here to avoid including <iostream.h> from this file
-  ostream *m_ostr;
+    // using ptr here to avoid including <iostream.h> 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:

 /*
 /*

-// log everything to a text window (GUI only of course)
-class WXDLLEXPORT wxLogTextCtrl : public wxLogStream
+    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:
 {
 public:

-  // we just create an ostream from wxTextCtrl and use it in base class
-  wxLogTextCtrl(wxTextCtrl *pTextCtrl);
- ~wxLogTextCtrl();
+    wxLogNull() : m_flagOld(wxLog::EnableLogging(false)) { }
+    ~wxLogNull() { (void)wxLog::EnableLogging(m_flagOld); }
+
+private:
+    bool m_flagOld; // the previous value of the wxLog::ms_doLog

 };
 };

-*/

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

-// GUI log target, the default one for wxWindows programs
+// 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 wxLogGui : public wxLog
+
+class WXDLLIMPEXP_BASE wxLogChain : public wxLog

 {
 public:
 {
 public:

-  // ctor
-  wxLogGui();
+    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; }

 
 

-  // show all messages that were logged since the last Flush()
-  virtual void Flush();
+    // override base class version to flush the old logger as well
+    virtual void Flush();
+
+    // call to avoid destroying the old log target
+    void DetachOldLog() { m_logOld = NULL; }

 
 protected:
 
 protected:

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

 
 

-  wxArrayString m_aMessages;
-  bool          m_bErrors;
+    DECLARE_NO_COPY_CLASS(wxLogChain)

 };
 
 };
 

-// ----------------------------------------------------------------------------
-// /dev/null log target: suppress logging until this object goes out of scope
-// ----------------------------------------------------------------------------
+// a chain log target which uses itself as the new logger

 
 

-// 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
+#define wxLogPassThrough wxLogInterposer
+
+class WXDLLIMPEXP_BASE wxLogInterposer : public wxLogChain
+{
+public:
+    wxLogInterposer();
+
+private:
+    DECLARE_NO_COPY_CLASS(wxLogInterposer)
+};
+
+// a temporary interposer which doesn't destroy the old log target
+// (calls DetachOldLog)
+
+class WXDLLIMPEXP_BASE wxLogInterposerTemp : public wxLogChain

 {
 public:
 {
 public:

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

 
 private:
 
 private:

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

 };
 
 };
 

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

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


@@ -200,19 +541,155 @@ 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                                            \
+    wxDoLog##level##Wchar(const wxChar *format, ...);                       \
+    extern void WXDLLIMPEXP_BASE                                            \
+    wxDoLog##level##Utf8(const char *format, ...);                          \
+    WX_DEFINE_VARARG_FUNC_VOID(wxLog##level,                                \
+                               1, (const wxFormatString&),                  \
+                               wxDoLog##level##Wchar, wxDoLog##level##Utf8) \
+    DECLARE_LOG_FUNCTION_WATCOM(level)                                      \
+    extern void WXDLLIMPEXP_BASE wxVLog##level(const wxString& format,      \
+                                               va_list argptr)
+
+#ifdef __WATCOMC__
+    // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351;
+    // can't use WX_WATCOM_ONLY_CODE here because the macro would expand to
+    // something too big for Borland C++ to handle
+    #define DECLARE_LOG_FUNCTION_WATCOM(level)                              \
+        WX_VARARG_WATCOM_WORKAROUND(void, wxLog##level,                     \
+                                   1, (const wxString&),                    \
+                                   (wxFormatString(f1)))                    \
+        WX_VARARG_WATCOM_WORKAROUND(void, wxLog##level,                     \
+                                   1, (const wxCStrData&),                  \
+                                   (wxFormatString(f1)))                    \
+        WX_VARARG_WATCOM_WORKAROUND(void, wxLog##level,                     \
+                                   1, (const char*),                        \
+                                   (wxFormatString(f1)))                    \
+        WX_VARARG_WATCOM_WORKAROUND(void, wxLog##level,                     \
+                                   1, (const wchar_t*),                     \
+                                   (wxFormatString(f1)))
+#else
+    #define DECLARE_LOG_FUNCTION_WATCOM(level)
+#endif
+
+
+#define DECLARE_LOG_FUNCTION2_EXP(level, argclass, arg, expdecl)            \
+    extern void expdecl wxDoLog##level##Wchar(argclass arg,                 \
+                                              const wxChar *format, ...);   \
+    extern void expdecl wxDoLog##level##Utf8(argclass arg,                  \
+                                             const char *format, ...);      \
+    WX_DEFINE_VARARG_FUNC_VOID(wxLog##level,                                \
+                               2, (argclass, const wxFormatString&),        \
+                               wxDoLog##level##Wchar, wxDoLog##level##Utf8) \
+    DECLARE_LOG_FUNCTION2_EXP_WATCOM(level, argclass, arg, expdecl)         \
+    extern void expdecl wxVLog##level(argclass arg,                         \
+                                      const wxString& format,               \
+                                      va_list argptr)
+
+#ifdef __WATCOMC__
+    // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351;
+    // can't use WX_WATCOM_ONLY_CODE here because the macro would expand to
+    // something too big for Borland C++ to handle
+    #define DECLARE_LOG_FUNCTION2_EXP_WATCOM(level, argclass, arg, expdecl) \
+        WX_VARARG_WATCOM_WORKAROUND(void, wxLog##level,                     \
+                                   2, (argclass, const wxString&),          \
+                                   (f1, wxFormatString(f2)))                \
+        WX_VARARG_WATCOM_WORKAROUND(void, wxLog##level,                     \
+                                   2, (argclass, const wxCStrData&),        \
+                                   (f1, wxFormatString(f2)))                \
+        WX_VARARG_WATCOM_WORKAROUND(void, wxLog##level,                     \
+                                   2, (argclass, const char*),              \
+                                   (f1, wxFormatString(f2)))                \
+        WX_VARARG_WATCOM_WORKAROUND(void, wxLog##level,                     \
+                                   2, (argclass, const wchar_t*),           \
+                                   (f1, wxFormatString(f2)))
+#else
+    #define DECLARE_LOG_FUNCTION2_EXP_WATCOM(level, argclass, arg, expdecl)
+#endif
+
+
+#else // !wxUSE_LOG
+
+#ifdef __WATCOMC__
+    // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
+    #define WX_WATCOM_ONLY_CODE( x )  x
+#else
+    #define WX_WATCOM_ONLY_CODE( x )
+#endif
+
+#if defined(__WATCOMC__) || defined(__MINGW32__)
+    // Mingw has similar problem with wxLogSysError:
+    #define WX_WATCOM_OR_MINGW_ONLY_CODE( x )  x
+#else
+    #define WX_WATCOM_OR_MINGW_ONLY_CODE( x )
+#endif
+
+// log functions do nothing at all
+#define DECLARE_LOG_FUNCTION(level)                                         \
+    WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 1, (const wxString&))           \
+    WX_WATCOM_ONLY_CODE(                                                    \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 1, (const char*))           \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 1, (const wchar_t*))        \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 1, (const wxCStrData&))     \
+    )                                                                       \
+    inline void wxVLog##level(const wxString& WXUNUSED(format),             \
+                              va_list WXUNUSED(argptr)) { }                 \
+
+#define DECLARE_LOG_FUNCTION2_EXP(level, argclass, arg, expdecl)            \
+    WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 2, (argclass, const wxString&)) \
+    WX_WATCOM_OR_MINGW_ONLY_CODE(                                           \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 2, (argclass, const char*)) \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 2, (argclass, const wchar_t*)) \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 2, (argclass, const wxCStrData&)) \
+    )                                                                       \
+    inline void wxVLog##level(argclass WXUNUSED(arg),                       \
+                              const wxString& WXUNUSED(format),             \
+                              va_list WXUNUSED(argptr)) {}
+
+// Empty Class to fake wxLogNull
+class WXDLLIMPEXP_BASE wxLogNull
+{
+public:
+    wxLogNull() { }
+};

 
 

-// NB: all these functions take `wxTString' and not
-//     `const wxTString&' because according to C++ standard
-//     the first argument to a vararg function can not be
-//     an array, function or reference :-(
+// Dummy macros to replace some functions.
+#define wxSysErrorCode() (unsigned long)0
+#define wxSysErrorMsg( X ) (const wxChar*)NULL

 
 

-// the most generic log function
-void WXDLLEXPORT wxLogGeneric(wxLog::Level level, wxTString strFormat, ...);
+// Fake symbolic trace masks... for those that are used frequently
+#define wxTRACE_OleCalls wxEmptyString // OLE interface calls

 
 

-#define DECLARE_LOG_FUNCTION(level)                                 \
-        extern void WXDLLEXPORT wxLog##level(wxTString strFormat, ...)
+#endif // wxUSE_LOG/!wxUSE_LOG
+
+#define DECLARE_LOG_FUNCTION2(level, argclass, arg)                         \
+    DECLARE_LOG_FUNCTION2_EXP(level, argclass, arg, WXDLLIMPEXP_BASE)
+
+// VC6 produces a warning if we a macro expanding to nothing to
+// DECLARE_LOG_FUNCTION2:
+#if defined(__VISUALC__) && __VISUALC__ < 1300
+    // "not enough actual parameters for macro 'DECLARE_LOG_FUNCTION2_EXP'"
+    #pragma warning(disable:4003)
+#endif
+
+// 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);
 
 // one function per each level
 DECLARE_LOG_FUNCTION(FatalError);


@@ -220,56 +697,136 @@ DECLARE_LOG_FUNCTION(Error);
 DECLARE_LOG_FUNCTION(Warning);
 DECLARE_LOG_FUNCTION(Message);
 DECLARE_LOG_FUNCTION(Info);
 DECLARE_LOG_FUNCTION(Warning);
 DECLARE_LOG_FUNCTION(Message);
 DECLARE_LOG_FUNCTION(Info);

-DECLARE_LOG_FUNCTION(Status);

 DECLARE_LOG_FUNCTION(Verbose);
 
 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
+    class WXDLLIMPEXP_FWD_CORE 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
 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))
 // 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))

-void WXDLLEXPORT wxLogSysError(long lErrCode, wxTString strFormat, ...);
-
-// debug functions don't translate their arguments
-#undef  DECLARE_LOG_FUNCTION
-#define DECLARE_LOG_FUNCTION(level)                                 \
-        extern void WXDLLEXPORT wxLog##level(const char *szFormat, ...)
-
-DECLARE_LOG_FUNCTION(Debug);
-DECLARE_LOG_FUNCTION(Trace);
-
-// 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);
+DECLARE_LOG_FUNCTION2(SysError, long, lErrCode);
+#ifdef __WATCOMC__
+// workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
+DECLARE_LOG_FUNCTION2(SysError, unsigned long, lErrCode);
+#endif
+
+// debug functions do nothing in release mode
+#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 wxString&, mask);
+#ifdef __WATCOMC__
+    // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
+    DECLARE_LOG_FUNCTION2(Trace, const char*, mask);
+    DECLARE_LOG_FUNCTION2(Trace, const wchar_t*, mask);
+#endif
+
+    // 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);
+#ifdef __WATCOMC__
+    // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
+    DECLARE_LOG_FUNCTION2(Trace, int, mask);
+#endif
+#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
+        //inline void wxLogDebug(const wxString& fmt, ...) {}
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogDebug, 1, (const wxString&))
+        //inline void wxLogTrace(wxTraceMask, const wxString& fmt, ...) {}
+        //inline void wxLogTrace(const wxString&, const wxString& fmt, ...) {}
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (wxTraceMask, const wxString&))
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (const wxString&, const wxString&))
+        #ifdef __WATCOMC__
+        // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (const char*, const char*))
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (const wchar_t*, const wchar_t*))
+        #endif
+    #endif // HAVE_VARIADIC_MACROS/!HAVE_VARIADIC_MACROS
+#endif // debug/!debug
+
+#if defined(__VISUALC__) && __VISUALC__ < 1300
+    #pragma warning(default:4003)
+#endif
+
+// 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  __DEBUG__
-  #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, ::GetLastError())
+#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)."),       \
+                   __FILE__, __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)."),                                \
+                   __FILE__, __LINE__, api,                                   \
+                   (long)rc, wxSysErrorMsg(rc))
+#endif // VC++/!VC++
+
+    #define wxLogLastError(api) wxLogApiError(api, wxSysErrorCode())
+

 #else   //!debug
 #else   //!debug

-  #define wxLogApiError(api, rc)
-  #define wxLogLastError(api)
+    #define wxLogApiError(api, err) wxLogNop()
+    #define wxLogLastError(api) wxLogNop()

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

-#endif  //__LOGH__
+// wxCocoa has additiional trace masks
+#if defined(__WXCOCOA__)
+#include "wx/cocoa/log.h"
+#endif
+
+#ifdef WX_WATCOM_ONLY_CODE
+    #undef WX_WATCOM_ONLY_CODE
+#endif
+
+#endif  // _WX_LOG_H_
+