vnclog.cpp
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上传日期:2007-05-02
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- // Copyright (C) 2002-2003 RealVNC Ltd. All Rights Reserved.
//
// This program 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 program is not available from the place from
// which you received this file, check http://www.realvnc.com/ or contact
// the authors on info@realvnc.com for information on obtaining it.
// Log.cpp: implementation of the VNCLog class.
//
//////////////////////////////////////////////////////////////////////
- #include <io.h>
- #include <windows.h>
#include "VNCLog.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
const int VNCLog::ToDebug = 1;
const int VNCLog::ToFile = 2;
const int VNCLog::ToConsole = 4;
const static int LINE_BUFFER_SIZE = 1024;
VNCLog::VNCLog()
{
m_lastLogTime = 0;
m_filename = NULL;
m_append = false;
hlogfile = NULL;
m_todebug = false;
m_toconsole = false;
m_tofile = false;
}
void VNCLog::SetMode(int mode) {
if (mode & ToDebug)
m_todebug = true;
else
m_todebug = false;
if (mode & ToFile) {
if (!m_tofile)
OpenFile();
} else {
CloseFile();
m_tofile = false;
}
if (mode & ToConsole) {
if (!m_toconsole) {
AllocConsole();
fclose(stdout);
fclose(stderr);
int fh = _open_osfhandle((long)GetStdHandle(STD_OUTPUT_HANDLE), 0);
_dup2(fh, 1);
_dup2(fh, 2);
_fdopen(1, "wt");
_fdopen(2, "wt");
printf("fh is %dn",fh);
fflush(stdout);
}
m_toconsole = true;
} else {
m_toconsole = false;
}
}
void VNCLog::SetLevel(int level) {
m_level = level;
}
void VNCLog::SetFile(const char* filename, bool append)
{
if (m_filename != NULL)
free(m_filename);
m_filename = strdup(filename);
m_append = append;
if (m_tofile)
OpenFile();
}
void VNCLog::OpenFile()
{
// Is there a file-name?
if (m_filename == NULL)
{
m_todebug = true;
m_tofile = false;
Print(0, "Error opening log filen");
return;
}
m_tofile = true;
// If there's an existing log and we're not appending then move it
if (!m_append)
{
// Build the backup filename
char *backupfilename = new char[strlen(m_filename)+5];
if (backupfilename)
{
strcpy(backupfilename, m_filename);
strcat(backupfilename, ".bak");
// Attempt the move and replace any existing backup
// Note that failure is silent - where would we log a message to? ;)
MoveFileEx(m_filename, backupfilename, MOVEFILE_REPLACE_EXISTING);
delete [] backupfilename;
}
}
CloseFile();
// If filename is NULL or invalid we should throw an exception here
hlogfile = CreateFile(
m_filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL );
if (hlogfile == INVALID_HANDLE_VALUE) {
// We should throw an exception here
m_todebug = true;
m_tofile = false;
Print(0, "Error opening log file %sn", m_filename);
}
if (m_append) {
SetFilePointer( hlogfile, 0, NULL, FILE_END );
} else {
SetEndOfFile( hlogfile );
}
}
// if a log file is open, close it now.
void VNCLog::CloseFile() {
if (hlogfile != NULL) {
CloseHandle(hlogfile);
hlogfile = NULL;
}
}
inline void VNCLog::ReallyPrintLine(const char* line)
{
if (m_todebug) OutputDebugString(line);
if (m_toconsole) {
DWORD byteswritten;
WriteConsole(GetStdHandle(STD_OUTPUT_HANDLE), line, strlen(line), &byteswritten, NULL);
};
if (m_tofile && (hlogfile != NULL)) {
DWORD byteswritten;
WriteFile(hlogfile, line, strlen(line), &byteswritten, NULL);
}
}
void VNCLog::ReallyPrint(const char* format, va_list ap)
{
time_t current = time(0);
if (current != m_lastLogTime) {
m_lastLogTime = current;
ReallyPrintLine(ctime(&m_lastLogTime));
}
// - Write the log message, safely, limiting the output buffer size
TCHAR line[LINE_BUFFER_SIZE];
_vsnprintf(line, LINE_BUFFER_SIZE, format, ap);
ReallyPrintLine(line);
}
VNCLog::~VNCLog()
{
if (m_filename != NULL)
free(m_filename);
CloseFile();
}