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Log.h
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Log.h
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// Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
//
// This file is part of the VNC system.
//
// The VNC system is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
//
// If the source code for the VNC system is not available from the place
// whence you received this file, check http://www.uk.research.att.com/vnc or
// contact the authors on [email protected] for information on obtaining it.
//
// This is an object and macros which provide general logging and debugging functions.
// It can log to a file, to a new console, and/or to debug - others maybe to follow.
// Every log object has a logging level (which can be changed).
// Only log requests with a high enough level attached get logged. So the
// level can be thought of as 'amount of detail'.
// We use Unicode-portable stuff here for compatibility with WinCE.
//
// Typical use:
//
// Log log;
// log.SetFile( _T("myapp.log") );
// ...
// log.Print(2, _T("x = %d\n"), x);
//
#pragma once
#include <stdarg.h>
class Log
{
public:
// Logging mode flags:
static const int ToDebug;
static const int ToFile;
static const int ToConsole;
// Create a new log object.
// Parameters as follows:
// mode - specifies where output should go, using combination
// of flags above. ToConsole won't do anything on CE.
// level - the default level
// filename - if flag Log::ToFile is specified in the type,
// a filename must be specified here.
// append - if logging to a file, whether or not to append to any
// existing log.
Log(int mode = ToDebug, int level = 1, LPTSTR filename = NULL, bool append = false);
inline void Print(int level, LPTSTR format, ...) {
if (level > m_level) return;
va_list ap;
va_start(ap, format);
ReallyPrint(format, ap);
va_end(ap);
}
// Change the log level
void SetLevel(int level);
// Change the logging mode
void SetMode(int mode);
// Change or set the logging filename. This enables ToFile mode if
// not already enabled.
void SetFile(LPTSTR filename, bool append = false);
virtual ~Log();
private:
void ReallyPrint(LPTSTR format, va_list ap);
void CloseFile();
bool m_tofile, m_todebug, m_toconsole;
int m_level;
HANDLE hlogfile;
};