用vb和mapx4开发的一个小系统，实现了gis的一些基本功能，例如文件（gst\\tab文件）的打开保存，图形要素的编辑等-mapx4 with vb and development of a small system that the gis some of the basic functionality, for example document (gst \\ tab) opened the preservation, graphics and other elements of edi