如何初始化ITopologyRule指针。

ITopologyRulePtr ipTopologyRule;
ipTopologyRule->put_TopologyRuleType(esriTRTAreaNoOverlapArea); //层内要素是否重叠;
ipTopologyRule->put_Name(_bstr_t((LPCTSTR)topologyRuleName.utf16())); //dstring转BSTR
ipTopologyRule->put_OriginClassID(featureId);
ipTopologyRule->put_AllOriginSubtypes(VARIANT_TRUE);