自己编写的CAD二次开发程序，采用objectARX，功能实现了遍历CAD中所有图层的（也可方便指定图层）的实体的扩展属性（即XData）,利用此程序可方便的提取出你所指定的对象！（本程序在objectARX2002下开发）-prepared by their CAD program, using objectARX. Traversing the realization of all CAD layer (which can also facilitate the designated layer) to the entity Extended Attributes (XDat a), the use of this procedure can be easily extracted your designated target! (This procedure objectARX2002 under development)