说明：  导航电子地图软件,借助于ESRI公司的mapobjects和arcobjects软件,用C++开发,本代码已经过编译和调试,能正常运行,实现通过鼠标对电子地图进行操作的功能.
(electronic map navigation software, using ESRI, the mapobjects arcobjects and software development using C, The code has been compiling and debugging, normal operation can achieve through electronic map of the mouse for operation of the function.)