Then ,the format of DIB(Device Independent Bitmap) is briefly introduced. Having Analyzed the format of CAD-files with a example of a mesh surface obtained by AutoCAD, a method of directly extracting data from CAD-files is proposed and realized in VC++.

• 通过分析常用CAD文件格式，提出直接从CAD数据文件中获得理论数据的方法，并用VC++进行编程予以实现，以AutoCAD生成的网格曲面为例进行了数据提取。