VC开发AO-画线出现问题，请高手指点！

<P>void CMy1105Dlg::OnOnMouseDownMapcontrol1(long button, long shift, long x, long y, double mapX, double mapY)
{</P>
<P>ILayerPtr ilayer;</P>
<P>
  for(b=0;b<=a-1;b++)
  {
    m_ipMapControl->get_Layer(b,;ilayer);
    IFeatureLayerPtr ifeatlayer(ilayer);
    IFeatureClassPtr ifeatclass;
    ifeatlayer->get_FeatureClass(;ifeatclass);
    CComBSTR storename;
    ifeatlayer->get_Name(;storename);
    if(storename="ushigh")
    {
     IPointPtr ippoint(CLSID_Point);
     if(ippoint==NULL)return;
     ippoint->PutCoords(mapX,mapY);
      IPointPtr ippoint1(CLSID_Point);
     if(ippoint1==NULL)return;
      ippoint1->PutCoords(mapX,mapY)；</P>
<P>     IPolylinePtr ipline(CLSID_Polyline);
                 if(ipline==NULL)return;
     ipline->get_FromPoint(;ippoint);
     ipline->get_ToPoint(;ippoint1);
     IGeometryPtr ipgeometry(ipline);
     if(ipgeometry==NULL)return;
     IFeaturePtr ifeat;
     ifeatclass->CreateFeature(;ifeat);
     ifeat->putref_Shape(ipgeometry);
     ifeat->Store();
     long featcount1;
     long fieldid;
     IQueryFilterPtr iquery;
     ifeatclass->FeatureCount(iquery,;featcount1);
     IRowPtr irow;
     ITablePtr itable;
     CComBSTR fieldname="TYPE";
     CComVariant varFn1("www");/
     ifeat->get_Table(;itable);
     if(itable==NULL)return;
     itable->GetRow(featcount1-1,;irow);
     itable->FindField(fieldname,;fieldid);
     irow->put_Value(fieldid,varFn1);
     irow->Store();
     m_ipMapControl->DrawShape(ipgeometry,NULL);
     m_ipMapControl->Refresh(esriViewGeography);
    
    }
  }
}   </P>
<P>}</P>
<P>此代码不存在错误，能给属性表添加属性，但是却不能显示所画的线，为什么？</P>