BOOL Open(LPCTSTR lpszFileName, UINT nOpenFlags, CFileException* pError = NULL);

lpszFileName
	ļ

nOpenFlags 
	CFile::modeCreate һļ򿪣ļѴڣԭݱ
	CFile::modeRead   ļ
	CFile::modeReadWriteļ/д
	CFile::modeWrite  ļд
	CFile::typeText   ıļģʽֻУ
	CFile::typeBinary öļģʽֻУ


ֵTRUE  ɹ
        FALSE  ʧ