通过ole回调操作mapinfo，实现地图功能，比较实用，而且已经编译完成。在网上有许多的文章介绍，但是不能在delphi下编译通过。-By ole callback operations mapinfo, realization of the map function, more practical, and has been compiled. There are many articles in the online descr iption, but not in delphi comp