栅格矢量转换的dll,vc＋ao写的，第一次写这样的代码，请大家多多指教-raster vector conversion dll, vc + ao wrote that the first write such code, please exhibitions

在AUTOCAD环境中，针对于光栅地图图手工矢量化数字地形点-in AutoCAD environment to address raster map plan manual vector digital terrain point