They design an OLE DB provider for MAPGIS with VISUAL C++ ATL, which can get value of normal type of field according to MAPGIS data structure.

• 针对MAPGIS地理信息系统用VI SUALC ++ATL设计了一个OLEDB提供者 ；该提供者能够根据MAPGIS数据的结构动态读取常规类型的字段值 .