IGeometryPtr ipGeometry1;
IGeometryPtr ipGeometry2;
IGeometryPtr ipGeometry3;
long lOID1,lOID2;
ipFeature1->get_Shape(&ipGeometry1);
ipFeature1->get_OID(&lOID1);
ipFeature2->get_Shape(&ipGeometry2);
ipFeature2->get_OID(&lOID2);
IGeometryCollectionPtr ipGeometryCollection(CLSID_Polygon);
IGeometryCollectionPtr ipGeometryCollection1;
IGeometryCollectionPtr ipGeometryCollection2;
ipGeometryCollection1=ipGeometry1;
ipGeometryCollection2=ipGeometry2;
hr= ipGeometryCollection->AddGeometryCollection(ipGeometryCollection1);
if(FAILED(hr))
return ;
hr= ipGeometryCollection->AddGeometryCollection(ipGeometryCollection2);
if(FAILED(hr))
return ;
ipGeometryCollection->QueryInterface(IID_IGeometry,(void **)&ipGeometry3);
if(FAILED(hr))
return ;
ITopologicalOperatorPtr ipTopogicalOperator;
ipTopogicalOperator=ipGeometry3;
ipTopogicalOperator->Simplify();
IFeaturePtr ipFeature3(CLSID_Feature);
ipPolygonFeatureClass->CreateFeature(&ipFeature3);
ipFeature3->putref_Shape(ipGeometry3);
hr= ipFeature3->Store();
if(FAILED(hr))
return ;