[求助]帮忙看下选择元素的代码？谢谢

帮忙看下选择元素的代码？谢谢<BR><BR>
<DIV>void CTestAeView::SelectElement(long x,long y) <BR>{<BR>  pActiveView = m_ipmap;<BR>IEnumElementPtr pEnumElem;<BR>IGraphicsContainerPtr pGraphicsContainer(m_ipmap);<BR>IGraphicsContainerSelectPtr pGraphicsContainerSelect(m_ipmap);<BR>IRubberBandPtr pRubberBand(CLSID_RubberEnvelope);<BR>IScreenDisplayPtr  pScreenDisplay;<BR>IEnvelope2Ptr pEnvelop(CLSID_Envelope);<BR>IGeometry2Ptr pGeom(pEnvelop);<BR>    pActiveView->get_ScreenDisplay(;pScreenDisplay);<BR>pRubberBand->TrackNew(pScreenDisplay,NULL,NULL);<BR>pGraphicsContainerSelect->UnselectAllElements();<BR>if (pEnvelop == NULL)<BR>{<BR>  IDisplayTransformationPtr pDisplayTransformation;<BR>  pScreenDisplay->get_DisplayTransformation(;pDisplayTransformation);<BR>  IPointPtr pPoint(CLSID_Point);<BR>  pDisplayTransformation->ToMapPoint(x,y,;pPoint);<BR>  double w;<BR>  pEnvelop->get_Width(;w);<BR>  pActiveView->put_Extent(pEnvelop);<BR>  pGraphicsContainer->LocateElements(pPoint,w/200,;pEnumElem);<BR>}<BR>else<BR>{<BR>        pGraphicsContainer->LocateElementsByEnvelope(pEnvelop,;pEnumElem);<BR>}<BR>if (pEnumElem != NULL)<BR>{<BR>  pGraphicsContainerSelect->UnselectAllElements();<BR>  pEnumElem->Reset();<BR>  pGraphicsContainerSelect->SelectElements(;pEnumElem);<BR>  IElementPtr pElement;<BR>  pEnumElem->Next(;pElement);<BR>}<BR>   pActiveView->PartialRefresh(esriViewGraphicSelection,NULL,NULL);<BR>}<BR>为什么选不中元素？问题出在哪里？</DIV>

你用pActiveView.Refresh()刷新一下试试。