VC++6.0自定义实现日志记录到文件及界面显示

1，实现日志记录到文件，支持日志文件大小限制，节省空间

void CController::LogWriteRecord(CString strText,CString strFileName)
{
	CStdioFile csFile;
	try
	{
		BOOL bRet = csFile.Open(strFileName,CFile::modeCreate
			|CFile::modeNoTruncate
			|CFile::modeReadWrite|CFile::shareDenyNone|CFile::typeText);
		csFile.SeekToEnd();
		CString strWriteText=strText+"\r\n";
		csFile.WriteString(strWriteText);
		//csFile.Write(strWriteText.GetBuffer(strWriteText.GetLength()),1);
		strWriteText.ReleaseBuffer();
		DWORD64 dwFileLen = csFile.GetLength();
		
		if(!bRet)
		{
			TRACE("Open failed exception\r\n");	
		}
		if(dwFileLen > constIFileMaxLen)
		{
			csFile.Seek(-constIFileMaxLen,CFile::end);
			char *pcBuf = new char[constIFileMaxLen];
			memset(pcBuf,0,constIFileMaxLen);
			csFile.Read(pcBuf,constIFileMaxLen);
			int iLoop = 0;
			for( iLoop = 0;iLoop<constIFileMaxLen;iLoop++)
			{
				if(0x0a == pcBuf[iLoop])
				{
					break;			
				}
			}
			iLoop++;
			csFile.SeekToBegin()