TCHAR* pFileName = _T("file.data");
	CStdioFile f1;
	if (!f1.Open(pFileName,CFile::modeCreate|CFile::modeWrite|CFile::typeText))
	{
		TRACE(_T("Unable to open file"));
	}
	f1.WriteString(_T("helloworld"));
	f1.Flush();
	f1.Close();