CString寫入txt文件

void PrintLog(CString str)
{
 if (str.IsEmpty())
 {
  return;
 }
 CString Temp;
 CStdioFile File;
 File.Open(_T("wyl.txt"), CFile::modeReadWrite|CFile::modeNoTruncate|CFile::modeCreate);
 File.SeekToEnd();
 Temp = _T("\r\n-----------------------BEGIN------------------------\r\n");
 Temp += str;
 Temp += _T("\r\n-----------------------END------------------------\r\n");
 File.WriteString(Temp );
 File.Close();

}