利用GIS插件编程实现GIS基本功能，包括放大、缩小、添加数据等,GIS plug-in programming basic GIS functions, including zoom in, zoom out, add data

该程序可以读取坐标文件，画出中国地图，是一个很不错的vc程序，对初学者很有用。-The program can read the coordinates of the document, draw the map of China, is a very good vc procedures, very useful for beginners.