vc使用dwgdirectx，这里调用了显示控件，自带的例子是没有的。-vc use dwgdirectx, here called the display control, bring their own examples are not.

基于DWGdirectX和vc6平台开发的dwg读写小程序，可实现dwg读入，写出，简单绘图等功能-Based DWGdirectX and vc6 platform development dwg to read and write small programs can be realized dwg read, write, simple graphics functions