mapobject是做电子地图必备的控件，但是网上的例子，多半是以vb作为编程基础讲解了，这里是我收藏的一个以vc编写的一些有用的函数。-mapobject is necessary to make the electronic map controls, but examples of the Internet, mostly as a programming foundation is vb explain, here are some useful functions I have a c