请教AcDbWipeout的用法

jay0708

AcDbObjectId objectId;
AcDbWipeout *pWipeout = new AcDbWipeout();
pWipeout->setDisplayOpt(AcDbRasterImage::kClip,TRUE);
pWipeout->setClipBoundary(AcDbRasterImage::kPoly,poly2d);
Acad::ErrorStatus es = pWipeout->append(objectId);//永远返回 Acad::eNoClassId

append一直返回失败。求解？这段代码不知道写的是否正确，请教应该如何创建AcDbWipeout并添加到模型空间里

zzyong00

AcDbWipeout，好像只能用wipeout命令创建吧