C++写错误日志函数

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在编写程序，有些问题借助错误日志更好跟踪。

UNICODE代码：

DWORD WriteErrLog ( CString strError)
{
DWORD nWrite=0, bytesWritten;
HANDLE hFile;
BOOL res;
CString strErrorLog, strTime ,strLogName;

SYSTEMTIME dt;//错误信息 +日期
GetLocalTime(&dt);
strTime.Format(" %04d/%02d/%02d %02d:%02d:%02d\r\n",dt.wYear, dt.wMonth, dt.wDay, dt.wHour, dt.wMinute, dt.wSecond );
TCHAR tstrCurrentPath[MAX_PATH];
TCHAR g_pInfPath[MAX_PATH];
memset(tstrCurrentPath, 0, MAX_PATH);
memset(g_pInfPath, 0, MAX_PATH);
//Get
GetCurrentDirectory(MAX_PATH, tstrCurrentPath);
CString strPath;
strPath.Format(_T("%s"),tstrCurrentPath);
strcpy(g_pInfPath,tstrCurrentPath);
strcat(g_pInfPath,_T("\\错误日志.ini"));
strLogName= g_pInfPath;
hFile = CreateFile( strLogName, GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0 ) ;
if( ERROR_ALREADY_EXISTS == GetLastError() )
{
DWORD lDistance =0;
DWORD dwPtr = SetFilePointer(hFile, lDistance, NULL, FILE_END);
if ( INVALID_SET_FILE_POINTER == dwPtr )
{
CloseHandle(hFile);
return -1;
}

strErrorLog=strError+strTime;
DWORD lengh =strErrorLog.GetLength();
res = WriteFile(hFile,strErrorLog,lengh*sizeof(WCHAR),&nWrite,NULL);

}
else if( 0x0 == GetLastError() )
{
//LPCVOID
BYTE head[2];
head[0] = 0xff;
head[1] = 0xfe;

//Unicode 格式文本，需要写入文件头两个字节　0xff 0xfe
WriteFile(hFile, (BYTE*)head, 2, &bytesWritten, NULL);
//再写入内容
DWORD lDistance =2;
DWORD dwPtr = SetFilePointer(hFile, lDistance, NULL, FILE_BEGIN);
if ( INVALID_SET_FILE_POINTER == dwPtr )
{
CloseHandle(hFile);
return -1;
}

strErrorLog=strError+strTime;
DWORD lengh =strErrorLog.GetLength();
res = WriteFile(hFile,strErrorLog,lengh*sizeof(WCHAR),&nWrite,NULL);
}
CloseHandle(hFile);
return (DWORD)res;
}

多字节代码

DWORD WriteErrLog ( CString strError)
{
DWORD nWrite=0, bytesWritten;
HANDLE hFile;
BOOL res;
CString strErrorLog, strTime ,strLogName;

SYSTEMTIME dt;//错误信息 +日期
GetLocalTime(&dt);
strTime.Format(" %04d/%02d/%02d %02d:%02d:%02d\r\n",dt.wYear, dt.wMonth, dt.wDay, dt.wHour, dt.wMinute, dt.wSecond );
TCHAR tstrCurrentPath[MAX_PATH];
TCHAR g_pInfPath[MAX_PATH];
memset(tstrCurrentPath, 0, MAX_PATH);
memset(g_pInfPath, 0, MAX_PATH);
//Get
GetCurrentDirectory(MAX_PATH, tstrCurrentPath);
CString strPath;
strPath.Format(_T("%s"),tstrCurrentPath);
strcpy(g_pInfPath,tstrCurrentPath);
strcat(g_pInfPath,_T("\\错误日志.ini"));
strLogName= g_pInfPath;
hFile = CreateFile( strLogName, GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0 ) ;
if( ERROR_ALREADY_EXISTS == GetLastError() )
{
DWORD lDistance =0;
DWORD dwPtr = SetFilePointer(hFile, lDistance, NULL, FILE_END);
if ( INVALID_SET_FILE_POINTER == dwPtr )
{
CloseHandle(hFile);
return -1;
}

strErrorLog=strError+strTime;
DWORD lengh =strErrorLog.GetLength();
res = WriteFile(hFile,strErrorLog,lengh*sizeof(CHAR),&nWrite,NULL);

}
else if( 0x0 == GetLastError() )
{
//再写入内容
DWORD lDistance =0;
DWORD dwPtr = SetFilePointer(hFile, lDistance, NULL, FILE_BEGIN);
if ( INVALID_SET_FILE_POINTER == dwPtr )
{
CloseHandle(hFile);
return -1;
}

strErrorLog=strError+strTime;
DWORD lengh =strErrorLog.GetLength();
res = WriteFile(hFile,strErrorLog,lengh*sizeof(CHAR),&nWrite,NULL);
}
CloseHandle(hFile);
return (DWORD)res;
}

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