log.h

浙江大学的悟空嵌入式系统模拟器

        // ~wxLogNull called, old log sink restored
    }
 */
class WXDLLEXPORT wxLogNull
{
public:
    wxLogNull() : m_flagOld(wxLog::EnableLogging(FALSE)) { }
    ~wxLogNull() { (void)wxLog::EnableLogging(m_flagOld); }

private:
    bool m_flagOld; // the previous value of the wxLog::ms_doLog
};

// ----------------------------------------------------------------------------
// chaining log target: installs itself as a log target and passes all
// messages to the real log target given to it in the ctor but also forwards
// them to the previously active one
//
// note that you don't have to call SetActiveTarget() with this class, it
// does it itself in its ctor
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxLogChain : public wxLog
{
public:
    wxLogChain(wxLog *logger);
    virtual ~wxLogChain();

    // change the new log target
    void SetLog(wxLog *logger);

    // this can be used to temporarily disable (and then reenable) passing
    // messages to the old logger (by default we do pass them)
    void PassMessages(bool bDoPass) { m_bPassMessages = bDoPass; }

    // are we passing the messages to the previous log target?
    bool IsPassingMessages() const { return m_bPassMessages; }

    // return the previous log target (may be NULL)
    wxLog *GetOldLog() const { return m_logOld; }

    // override base class version to flush the old logger as well
    virtual void Flush();

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

private:
    // the current log target
    wxLog *m_logNew;

    // the previous log target
    wxLog *m_logOld;

    // do we pass the messages to the old logger?
    bool m_bPassMessages;
};

// a chain log target which uses itself as the new logger
class WXDLLEXPORT wxLogPassThrough : public wxLogChain
{
public:
    wxLogPassThrough();
};

// ----------------------------------------------------------------------------
// the following log targets are only compiled in if the we're compiling the
// GUI part (andnot just the base one) of the library, they're implemented in
// src/generic/logg.cpp *and not src/common/log.cpp unlike all the rest)
// ----------------------------------------------------------------------------

#if wxUSE_GUI

#if wxUSE_TEXTCTRL

// log everything to a text window (GUI only of course)
class WXDLLEXPORT wxLogTextCtrl : public wxLog
{
public:
    wxLogTextCtrl(wxTextCtrl *pTextCtrl);

private:
    // implement sink function
    virtual void DoLogString(const wxChar *szString, time_t t);

    // the control we use
    wxTextCtrl *m_pTextCtrl;
};

#endif // wxUSE_TEXTCTRL

// ----------------------------------------------------------------------------
// GUI log target, the default one for wxWindows programs
// ----------------------------------------------------------------------------

#if wxUSE_LOGGUI

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

    // show all messages that were logged since the last Flush()
    virtual void Flush();

protected:
    virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t);

    // empty everything
    void Clear();

    wxArrayString m_aMessages;      // the log message texts
    wxArrayInt    m_aSeverity;      // one of wxLOG_XXX values
    wxArrayLong   m_aTimes;         // the time of each message
    bool          m_bErrors,        // do we have any errors?
                  m_bWarnings;      // any warnings?
};

#endif // wxUSE_LOGGUI

// ----------------------------------------------------------------------------
// (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.
// ----------------------------------------------------------------------------

#if wxUSE_LOGWINDOW

class WXDLLEXPORT wxLogWindow : public wxLogPassThrough
{
public:
    wxLogWindow(wxFrame *pParent,         // the parent frame (can be NULL)
                const wxChar *szTitle,    // the title of the frame
                bool bShow = TRUE,        // show window immediately?
                bool bPassToOld = TRUE);  // pass 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;

    // overridables
        // called immediately after the log frame creation allowing for
        // any extra initializations
    virtual void OnFrameCreate(wxFrame *frame);
        // called if the user closes the window interactively, will not be
        // called if it is destroyed for another reason (such as when program
        // exits) - return TRUE from here to allow the frame to close, FALSE
        // to prevent this from happening
    virtual bool OnFrameClose(wxFrame *frame);
        // called right before the log frame is going to be deleted: will
        // always be called unlike OnFrameClose()
    virtual void OnFrameDelete(wxFrame *frame);

protected:
    virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t);
    virtual void DoLogString(const wxChar *szString, time_t t);

private:
    wxLogFrame *m_pLogFrame;      // the log frame
};

#endif // wxUSE_LOGWINDOW

#endif // wxUSE_GUI

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

// ----------------------------------------------------------------------------
// Log functions should be used by application instead of stdio, iostream &c
// for log messages for easy redirection
// ----------------------------------------------------------------------------

// ----------------------------------------------------------------------------
// get error code/error message from system in a portable way
// ----------------------------------------------------------------------------

// return the last system error code
WXDLLEXPORT unsigned long wxSysErrorCode();

// return the error message for given (or last if 0) error code
WXDLLEXPORT const wxChar* wxSysErrorMsg(unsigned long nErrCode = 0);

// ----------------------------------------------------------------------------
// define wxLog<level>
// ----------------------------------------------------------------------------

#define DECLARE_LOG_FUNCTION(level)                                 \
extern void WXDLLEXPORT wxVLog##level(const wxChar *szFormat,       \
                                      va_list argptr);              \
extern void WXDLLEXPORT wxLog##level(const wxChar *szFormat,        \
                                     ...) ATTRIBUTE_PRINTF_1
#define DECLARE_LOG_FUNCTION2(level, arg1)                          \
extern void WXDLLEXPORT wxVLog##level(arg1, const wxChar *szFormat, \
                                      va_list argptr);              \
extern void WXDLLEXPORT wxLog##level(arg1, const wxChar *szFormat,  \
                                     ...) ATTRIBUTE_PRINTF_2

#else // !wxUSE_LOG

// log functions do nothing at all
#define DECLARE_LOG_FUNCTION(level)                                 \
inline void WXDLLEXPORT wxVLog##level(const wxChar *szFormat,       \
                                     va_list argptr) {}             \
inline void WXDLLEXPORT wxLog##level(const wxChar *szFormat, ...) {}
#define DECLARE_LOG_FUNCTION2(level, arg1)                          \
inline void WXDLLEXPORT wxVLog##level(arg1, const wxChar *szFormat, \
                                     va_list argptr) {}             \
inline void WXDLLEXPORT wxLog##level(arg1, const wxChar *szFormat, ...) {}

#endif // wxUSE_LOG/!wxUSE_LOG

// a generic function for all levels (level is passes as parameter)
DECLARE_LOG_FUNCTION2(Generic, wxLogLevel level);

// one function per each level
DECLARE_LOG_FUNCTION(FatalError);
DECLARE_LOG_FUNCTION(Error);
DECLARE_LOG_FUNCTION(Warning);
DECLARE_LOG_FUNCTION(Message);
DECLARE_LOG_FUNCTION(Info);
DECLARE_LOG_FUNCTION(Verbose);

// this function sends the log message to the status line of the top level
// application frame, if any
DECLARE_LOG_FUNCTION(Status);

// 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);

// additional one: as wxLogError, but also logs last system call error code
// and the corresponding error message if available
DECLARE_LOG_FUNCTION(SysError);

// and another one which also takes the error code (for those broken APIs
// that don't set the errno (like registry APIs in Win32))
DECLARE_LOG_FUNCTION2(SysError, long lErrCode);

// debug functions do nothing in release mode
#if wxUSE_LOG_DEBUG
    DECLARE_LOG_FUNCTION(Debug);

    // first kind of LogTrace is unconditional: it doesn't check the level,
    DECLARE_LOG_FUNCTION(Trace);

    // this second version will only log the message if the mask had been
    // added to the list of masks with AddTraceMask()
    DECLARE_LOG_FUNCTION2(Trace, const wxChar *mask);

    // the last one does nothing if all of level bits are not set
    // in wxLog::GetActive()->GetTraceMask() - it's deprecated in favour of
    // string identifiers
    DECLARE_LOG_FUNCTION2(Trace, wxTraceMask mask);
#else   //!debug
    // these functions do nothing in release builds
    inline void wxVLogDebug(const wxChar *, va_list) { }
    inline void wxLogDebug(const wxChar *, ...) { }
    inline void wxVLogTrace(const wxChar *, va_list) { }
    inline void wxLogTrace(const wxChar *, ...) { }
    inline void wxVLogTrace(wxTraceMask, const wxChar *, va_list) { }
    inline void wxLogTrace(wxTraceMask, const wxChar *, ...) { }
    inline void wxVLogTrace(const wxChar *, const wxChar *, va_list) { }
    inline void wxLogTrace(const wxChar *, const wxChar *, ...) { }
#endif // debug/!debug

// wxLogFatalError helper: show the (fatal) error to the user in a safe way,
// i.e. without using wxMessageBox() for example because it could crash
void WXDLLEXPORT wxSafeShowMessage(const wxString& title, const wxString& text);

// ----------------------------------------------------------------------------
// debug only logging functions: use them with API name and error code
// ----------------------------------------------------------------------------

#ifdef __WXDEBUG__
    // make life easier for people using VC++ IDE: clicking on the message
    // will take us immediately to the place of the failed API
#ifdef __VISUALC__
    #define wxLogApiError(api, rc)                                            \
        wxLogDebug(wxT("%s(%d): '%s' failed with error 0x%08lx (%s)."),       \
                   __TFILE__, __LINE__, api,                                  \
                   (long)rc, wxSysErrorMsg(rc))
#else // !VC++
    #define wxLogApiError(api, rc)                                            \
        wxLogDebug(wxT("In file %s at line %d: '%s' failed with "             \
                       "error 0x%08lx (%s)."),                                \
                   __TFILE__, __LINE__, api,                                  \
                   (long)rc, wxSysErrorMsg(rc))
#endif // VC++/!VC++

    #define wxLogLastError(api) wxLogApiError(api, wxSysErrorCode())

#else   //!debug
    inline void wxLogApiError(const wxChar *, long) { }
    inline void wxLogLastError(const wxChar *) { }
#endif  //debug/!debug

#endif  // _WX_LOG_H_

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