2049ba38ad
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@224 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
336 lines
12 KiB
C++
336 lines
12 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: log.h
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// Purpose: Assorted wxLogXXX functions, and wxLog (sink for logs)
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 29/01/98
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// RCS-ID: $Id$
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// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// Licence: wxWindows license
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/////////////////////////////////////////////////////////////////////////////
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#ifndef __LOGH__
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#define __LOGH__
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#ifdef __GNUG__
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#pragma interface "log.h"
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#endif
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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// different standard log levels (you may also define your own)
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enum
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{
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wxLOG_FatalError, // program can't continue, abort immediately
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wxLOG_Error, // a serious error, user must be informed about it
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wxLOG_Warning, // user is normally informed about it but may be ignored
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wxLOG_Message, // normal message (i.e. normal output of a non GUI app)
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wxLOG_Info, // informational message (a.k.a. 'Verbose')
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wxLOG_Status, // informational: might go to the status line of GUI app
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wxLOG_Debug, // never shown to the user, disabled in release mode
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wxLOG_Trace, // trace messages are also only enabled in debug mode
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wxLOG_Progress, // used for progress indicator (not yet)
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wxLOG_User = 100 // user defined levels start here
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};
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// meaning of different bits of the trace mask (which allows selectively
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// enable/disable some trace messages)
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#define wxTraceMemAlloc 0x0001 // trace memory allocation (new/delete)
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#define wxTraceMessages 0x0002 // trace window messages/X callbacks
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#define wxTraceResAlloc 0x0004 // trace GDI resource allocation
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#define wxTraceRefCount 0x0008 // trace various ref counting operations
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#ifdef __WXMSW__
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#define wxTraceOleCalls 0x0100 // OLE interface calls
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#endif
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typedef unsigned long wxTraceMask;
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typedef unsigned long wxLogLevel;
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// ----------------------------------------------------------------------------
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// derive from this class to redirect (or suppress, or ...) log messages
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// normally, only a single instance of this class exists but it's not enforced
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// ----------------------------------------------------------------------------
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class WXDLLEXPORT wxLog
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{
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public:
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// ctor
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wxLog();
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// sink function
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static void OnLog(wxLogLevel level, const char *szString)
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{ if ( ms_pLogger != 0 ) ms_pLogger->DoLog(level, szString); }
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// message buffering
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// flush shows all messages if they're not logged immediately
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// (FILE and iostream logs don't need it, but wxGuiLog does to avoid
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// showing 17 modal dialogs one after another)
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virtual void Flush();
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// call to Flush() may be optimized: call it only if this function
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// returns true (although Flush() also returns immediately if there
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// is no messages, this functions is more efficient because inline)
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bool HasPendingMessages() const { return m_bHasMessages; }
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// only one sink is active at each moment
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// get current log target
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static wxLog *GetActiveTarget();
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// change log target, pLogger = NULL disables logging,
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// returns the previous log target
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static wxLog *SetActiveTarget(wxLog *pLogger);
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// functions controlling the default wxLog behaviour
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// verbose mode is activated by standard command-line '-verbose' option
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void SetVerbose(bool bVerbose = TRUE) { m_bVerbose = bVerbose; }
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// sets the format for timestamp prepended by wxLog::DoLog(): it's
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// passed to strftime() function, see it's documentation for details.
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// no time stamp at all if szTF is NULL or empty
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// NB: the string is not copied, so it's lifetime must be long enough!
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void SetTimeStampFormat(const char *szTF) { m_szTimeFormat = szTF; }
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// trace mask (see wxTraceXXX constants for details)
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void SetTraceMask(wxTraceMask ulMask) { m_ulTraceMask = ulMask; }
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// accessors
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// gets the verbose status
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bool GetVerbose() const { return m_bVerbose; }
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// get current time format
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const char *GetTimeStampFormat() const { return m_szTimeFormat; }
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// get trace mask
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wxTraceMask GetTraceMask() const { return m_ulTraceMask; }
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// make dtor virtual for all derived classes
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virtual ~wxLog() { }
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protected:
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bool m_bHasMessages;
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bool m_bVerbose; // FALSE => ignore LogInfo messages
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const char *m_szTimeFormat; // format for strftime()
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wxTraceMask m_ulTraceMask; // controls wxLogTrace behaviour
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// the logging functions that can be overriden
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// default DoLog() prepends the time stamp and a prefix corresponding
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// to the message to szString and then passes it to DoLogString()
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virtual void DoLog(wxLogLevel level, const char *szString);
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// default DoLogString does nothing but is not pure virtual because if
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// you override DoLog() you might not need it at all
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virtual void DoLogString(const char *szString);
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private:
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// static variables
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// ----------------
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static wxLog *ms_pLogger; // currently active log sink
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static bool ms_bInitialized; // any log targets created?
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};
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// ----------------------------------------------------------------------------
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// "trivial" derivations of wxLog
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// ----------------------------------------------------------------------------
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// log everything to a "FILE *", stderr by default
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class WXDLLEXPORT wxLogStderr : public wxLog
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{
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public:
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// redirect log output to a FILE
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wxLogStderr(FILE *fp = NULL);
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private:
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// implement sink function
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virtual void DoLogString(const char *szString);
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FILE *m_fp;
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};
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// log everything to an "ostream", cerr by default
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class WXDLLEXPORT wxLogStream : public wxLog
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{
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public:
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// redirect log output to an ostream
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wxLogStream(ostream *ostr = NULL);
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protected:
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// implement sink function
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virtual void DoLogString(const char *szString);
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// @@ using ptr here to avoid including <iostream.h> from this file
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ostream *m_ostr;
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};
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// log everything to a text window (GUI only of course)
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class wxTextCtrl;
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class WXDLLEXPORT wxLogTextCtrl : public wxLogStream
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{
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public:
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// we just create an ostream from wxTextCtrl and use it in base class
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wxLogTextCtrl(wxTextCtrl *pTextCtrl);
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~wxLogTextCtrl();
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};
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// ----------------------------------------------------------------------------
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// GUI log target, the default one for wxWindows programs
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// ----------------------------------------------------------------------------
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class WXDLLEXPORT wxLogGui : public wxLog
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{
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public:
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// ctor
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wxLogGui();
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// show all messages that were logged since the last Flush()
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virtual void Flush();
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protected:
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virtual void DoLog(wxLogLevel level, const char *szString);
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wxArrayString m_aMessages;
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bool m_bErrors;
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};
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// ----------------------------------------------------------------------------
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// (background) log window: this class forwards all log messages to the log
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// target which was active when it was instantiated, but also collects them
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// to the log window. This window has it's own menu which allows the user to
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// close it, clear the log contents or save it to the file.
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// ----------------------------------------------------------------------------
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class wxLogFrame;
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class WXDLLEXPORT wxLogWindow : public wxLog
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{
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public:
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wxLogWindow(const wxTString& strTitle, bool bShow = TRUE);
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~wxLogWindow();
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// show/hide the log window
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void Show(bool bShow = TRUE);
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// accessors
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wxLog *GetOldLog() const { return m_pOldLog; }
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protected:
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virtual void DoLog(wxLogLevel level, const char *szString);
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virtual void DoLogString(const char *szString);
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private:
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wxLog *m_pOldLog; // previous log target
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wxLogFrame *m_pLogFrame; // the log frame
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};
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// ----------------------------------------------------------------------------
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// /dev/null log target: suppress logging until this object goes out of scope
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// ----------------------------------------------------------------------------
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// example of usage:
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/*
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void Foo() {
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wxFile file;
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// wxFile.Open() normally complains if file can't be opened, we don't want it
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wxLogNull logNo;
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if ( !file.Open("bar") )
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... process error ourselves ...
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// ~wxLogNull called, old log sink restored
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}
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*/
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class WXDLLEXPORT wxLogNull
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{
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public:
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// ctor saves old log target, dtor restores it
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wxLogNull() { m_pPrevLogger = wxLog::SetActiveTarget(NULL); }
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~wxLogNull() { (void)wxLog::SetActiveTarget(m_pPrevLogger); }
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private:
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wxLog *m_pPrevLogger; // old log target
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};
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// ============================================================================
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// global functions
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// ============================================================================
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// ----------------------------------------------------------------------------
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// Log functions should be used by application instead of stdio, iostream &c
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// for log messages for easy redirection
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// ----------------------------------------------------------------------------
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// define wxLog<level>
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// -------------------
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// NB: all these functions take `wxTString' and not
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// `const wxTString&' because according to C++ standard
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// the first argument to a vararg function can not be
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// an array, function or reference :-(
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// the most generic log function
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void WXDLLEXPORT wxLogGeneric(wxLogLevel level, wxTString strFormat, ...);
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#define DECLARE_LOG_FUNCTION(level) \
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extern void WXDLLEXPORT wxLog##level(wxTString strFormat, ...)
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// one function per each level
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DECLARE_LOG_FUNCTION(FatalError);
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DECLARE_LOG_FUNCTION(Error);
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DECLARE_LOG_FUNCTION(Warning);
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DECLARE_LOG_FUNCTION(Message);
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DECLARE_LOG_FUNCTION(Info);
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DECLARE_LOG_FUNCTION(Status);
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DECLARE_LOG_FUNCTION(Verbose);
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// additional one: as wxLogError, but also logs last system call error code
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// and the corresponding error message if available
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DECLARE_LOG_FUNCTION(SysError);
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// and another one which also takes the error code (for those broken APIs
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// that don't set the errno (like registry APIs in Win32))
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void WXDLLEXPORT wxLogSysError(long lErrCode, wxTString strFormat, ...);
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// debug functions do nothing in release mode
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#ifdef __WXDEBUG__
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// NB: debug functions don't translate their arguments
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extern void WXDLLEXPORT wxLogDebug(const char *szFormat, ...);
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// first king of LogTrace is uncoditional: it doesn't check the level,
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// while the second one does nothing if all of level bits are not set
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// in wxLog::GetActive()->GetTraceMask().
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extern void WXDLLEXPORT wxLogTrace(const char *szFormat, ...);
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extern void WXDLLEXPORT wxLogTrace(wxTraceMask mask,
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const char *szFormat, ...);
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#else //!debug
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#define wxLogDebug
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#define wxLogTrace
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#endif
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// are we in 'verbose' mode?
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// (note that it's often handy to change this var manually from the
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// debugger, thus enabling/disabling verbose reporting for some
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// parts of the program only)
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WXDLLEXPORT_DATA(extern bool) g_bVerbose;
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// fwd decl to avoid including iostream.h here
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class ostream;
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// ----------------------------------------------------------------------------
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// get error code/error message from system in a portable way
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// ----------------------------------------------------------------------------
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// return the last system error code
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unsigned long WXDLLEXPORT wxSysErrorCode();
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// return the error message for given (or last if 0) error code
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const char* WXDLLEXPORT wxSysErrorMsg(unsigned long nErrCode = 0);
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// ----------------------------------------------------------------------------
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// debug only logging functions: use them with API name and error code
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// ----------------------------------------------------------------------------
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#ifdef __WXDEBUG__
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#define wxLogApiError(api, rc) \
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wxLogDebug("At %s(%d) '%s' failed with error %lx (%s).", \
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__FILE__, __LINE__, api, \
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rc, wxSysErrorMsg(rc))
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#define wxLogLastError(api) wxLogApiError(api, wxSysErrorCode())
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#else //!debug
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#define wxLogApiError(api, rc)
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#define wxLogLastError(api)
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#endif //debug/!debug
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#endif //__LOGH__
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