转换 - 数据类型转换
_bstr_t与CString相互转换:
_bstr_t bstr;
CString strSql;
CString -> _bstr_t: bstr = (_bstr_t)strSql;
_bstr_t -> CString: strSql = (LPCSTR)bstr;
_bstr_t bstr;
CString strSql;
CString -> _bstr_t: bstr = (_bstr_t)strSql;
_bstr_t -> CString: strSql = (LPCSTR)bstr;