学步园

一：选中一个要素

BOOL SelectFeature(IMapPtr pMap,IFeaturePtr pFea,BOOL bClearOld)
{
    if  (pMap == NULL)
       return FALSE;

     IActiveViewPtr pAV=pMap;

     IFeatureClassPtr pFeaCls = pFea->GetClass();

     if (pFeaCls==NULL)
         return FALSE;

     IFeatureLayerPtr pFeaLayer(__uuidof(FeatureLayer));

     pFeaLayer->putref_FeatureClass(pFeaCls);

     if (pFeaLayer==NULL)  return FALSE;
  

    IFeatureSelectionPtr pFeaSelet=pFeaLayer;
    if  (bClearOld )
    pFeaSelet->Clear();

    pFeaSelet->Add(pFea);

    long nSelCt=0;
    pMap->get_SelectionCount(&nSelCt);

    IEnvelopePtr  pEnvMap;
    pAV->get_Extent(&pEnvMap);

    if  (nSelCt > 0)
        pAV->PartialRefresh(esriViewGeoSelection, NULL, NULL); //  '局部刷新
   else
       pAV->PartialRefresh(esriViewGeoSelection, NULL, pEnvMap);

  return TRUE;
}