这个也是个老外做的CAD：能正确读取AutoCad各版本的DWG、DWF、DXF文件,而且功能好强@@是从个老外电脑复制的!-is is is is is is is is is is is is is is is is is is is is is is isi

source code provided library for using in Delphi and C++Builder applications. 2D and 3D CAD formats, including AutoCAD® DWG/DXF, Autodesk® DWF, Hewlett-Packard® HPGL/HPGL2, PLT, HGL, STEP, IGES, STL, ACIS SAT, BREP, CGM, SVG etc. are supp