log.h

来自「A*算法 A*算法 A*算法 A*算法A*算法A*算法」· C头文件 代码 · 共 611 行 · 第 1/2 页

/////////////////////////////////////////////////////////////////////////////
// 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: log.h,v 1.106 2005/07/17 13:00:08 MW Exp $
// Copyright:   (c) 1998 Vadim Zeitlin <[e-mail]>
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_LOG_H_
#define _WX_LOG_H_

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
    #pragma interface "log.h"
#endif

#include "wx/defs.h"

// ----------------------------------------------------------------------------
// 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// the trace masks have been superceded by symbolic trace constants, they're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"

#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
// ----------------------------------------------------------------------------

#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
// ----------------------------------------------------------------------------

class WXDLLIMPEXP_BASE wxLog
{
public:
    // ctor
    wxLog(){}

    // Internal buffer.

    // Allow replacement of the fixed size static buffer with
    // a user allocated one.  Pass in NULL to restore the
    // built in static buffer.
    static wxChar *SetLogBuffer( wxChar *buf, size_t size = 0 );

    // these functions allow to completely disable all log messages

    // is logging disabled now?
    static bool IsEnabled() { return ms_doLog; }

    // change the flag state, return the previous one
    static bool EnableLogging(bool doIt = true)
    { bool doLogOld = ms_doLog; ms_doLog = doIt; return doLogOld; }

    // static sink function - see DoLog() for function to overload in the
    // derived classes
    static void OnLog(wxLogLevel level, const wxChar *szString, time_t t)
    {
        if ( IsEnabled() && ms_logLevel >= level )
        {
            wxLog *pLogger = GetActiveTarget();
            if ( pLogger )
                pLogger->DoLog(level, szString, t);
        }
    }

    // message buffering

    // flush shows all messages if they're not logged immediately (FILE
    // and iostream logs don't need it, but wxGuiLog does to avoid showing
    // 17 modal dialogs one after another)
    virtual void Flush();

    // flush the active target if any
    static void FlushActive()
    {
        if ( !ms_suspendCount )
        {
            wxLog *log = GetActiveTarget();
            if ( log )
                log->Flush();
        }
    }

    // only one sink is active at each moment
    // get current log target, will call wxApp::CreateLogTarget() to
    // create one if none exists
    static wxLog *GetActiveTarget();

    // change log target, pLogger may be NULL
    static wxLog *SetActiveTarget(wxLog *pLogger);

    // suspend the message flushing of the main target until the next call
    // to Resume() - this is mainly for internal use (to prevent wxYield()
    // from flashing the messages)
    static void Suspend() { ms_suspendCount++; }

    // must be called for each Suspend()!
    static void Resume() { ms_suspendCount--; }

    // functions controlling the default wxLog behaviour
    // verbose mode is activated by standard command-line '-verbose'
    // option
    static void SetVerbose(bool bVerbose = true) { ms_bVerbose = bVerbose; }

    // Set log level.  Log messages with level > logLevel will not be logged.
    static void SetLogLevel(wxLogLevel logLevel) { ms_logLevel = logLevel; }

    // should GetActiveTarget() try to create a new log object if the
    // current is NULL?
    static void DontCreateOnDemand();

    // trace mask (see wxTraceXXX constants for details)
    static void SetTraceMask(wxTraceMask ulMask) { ms_ulTraceMask = ulMask; }

    // add string trace mask
    static void AddTraceMask(const wxString& str)
    { ms_aTraceMasks.push_back(str); }

    // add string trace mask
    static void RemoveTraceMask(const wxString& str);

    // remove all string trace masks
    static void ClearTraceMasks();

    // get string trace masks
    static const wxArrayString &GetTraceMasks() { return ms_aTraceMasks; }

    // sets the timestamp string: this is used as strftime() format string
    // for the log targets which add time stamps to the messages - set it
    // to NULL to disable time stamping completely.
    static void SetTimestamp(const wxChar *ts) { ms_timestamp = ts; }


    // accessors

    // gets the verbose status
    static bool GetVerbose() { return ms_bVerbose; }

    // get trace mask
    static wxTraceMask GetTraceMask() { return ms_ulTraceMask; }

    // is this trace mask in the list?
    static bool IsAllowedTraceMask(const wxChar *mask);

    // return the current loglevel limit
    static wxLogLevel GetLogLevel() { return ms_logLevel; }

    // get the current timestamp format string (may be NULL)
    static const wxChar *GetTimestamp() { return ms_timestamp; }


    // helpers

    // put the time stamp into the string if ms_timestamp != NULL (don't
    // change it otherwise)
    static void TimeStamp(wxString *str);

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


    // this method exists for backwards compatibility only, don't use
    bool HasPendingMessages() const { return true; }

protected:
    // the logging functions that can be overriden

    // default DoLog() prepends the time stamp and a prefix corresponding
    // to the message to szString and then passes it to DoLogString()
    virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t);

    // default DoLogString does nothing but is not pure virtual because if
    // you override DoLog() you might not need it at all
    virtual void DoLogString(const wxChar *szString, time_t t);

private:
    // static variables
    // ----------------

    static wxLog      *ms_pLogger;      // currently active log sink
    static bool        ms_doLog;        // false => all logging disabled
    static bool        ms_bAutoCreate;  // create new log targets on demand?
    static bool        ms_bVerbose;     // false => ignore LogInfo messages

    static wxLogLevel  ms_logLevel;     // limit logging to levels <= ms_logLevel

    static size_t      ms_suspendCount; // if positive, logs are not flushed

    // format string for strftime(), if NULL, time stamping log messages is
    // disabled
    static const wxChar *ms_timestamp;

    static wxTraceMask ms_ulTraceMask;   // controls wxLogTrace behaviour
    static wxArrayString ms_aTraceMasks; // more powerful filter for wxLogTrace
};

// ----------------------------------------------------------------------------
// "trivial" derivations of wxLog
// ----------------------------------------------------------------------------

#if wxABI_VERSION > 20601

// log everything to a buffer
class WXDLLIMPEXP_BASE wxLogBuffer : public wxLog
{
public:
    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: