这是对基于ObjectARX和VC的CAD二次开发简介，里面详细的介绍了如何设置以及如何给CAD添加命令，是一本不错的CAD二次开发参考书。另外不是扫描版本，非常清晰。-This is based on ObjectARX and VC Introduction of CAD secondary development, which detail how to set up and how to add commands to the CAD is a good CAD secondary development of reference books. Also not scan version, very clear.