求相关资料文档，或者代码片段，或者ycad的帮助文档。非常感谢求好心人...
http://www.iteye.com/topic/821044http://docs.autodesk.com/ACD/2011/CHS/filesDXF/WSfacf1429558a55de185c428100849a0ab7-5f35.htm我也才找这方面材料，少的可怜，现在依托ycad和dxf手册尝试读取和写dxf