块中含有自定义实体时调用explode()失败的原因及解决办法

今天在代码自测时，发现当块中含有自定义实体时，调用explode()会返回Adesk::eNotApplicable，而对自定义体直接调用explode()方法、以及在CAD执行“炸开”命令均正常。

用ARX开发包自带的polysamp例子进行模拟测试却正常。后经调试，发现对块参照调用explode()时，会调用自定义实体的getTransformedCopy()方法，故在自定义实体类中增加对getTransformedCopy()的重载，问题解决！

后来在Autodesk Discussion Groups中也得到证实：

AcDbBlockReference::explode() uses

getTransformedCopy() on each entity in the block definition to create the

explode set. Unfortunately, AcDbPolyFaceMesh::getTransformedCopy() doesn't

copy the xdata to the copy.

链接：http://forums.autodesk.com/t5/Autodesk-ObjectARX/Explode-with-the-ACAD-EXPLODE-Command/td-p/315823