vc++开发arx,用于cad二次开发,这个是讲实体选择等,不错的(Vc + + development arx for cad secondary development, and this is the entity selection, good)

一个mini版的cad作图系统，使用vc++开发，可以作为参考。(a mini cad system, developed based on visual c++ platform, can be referenced for developing.)