得到块定义id（通过块参照id）
bool PhdArxBlock::GetBlkDefId(AcDbObjectId& idBlkDef, const AcDbObjectId& idBlkRef) const{
AcDbObjectPointer<AcDbBlockReference> pRef(idBlkRef, AcDb::kForRead);
if (Acad::eOk != pRef.openStatus())
return false;
idBlkDef = pRef->blockTableRecord();
return true;
}
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