在VC中动态增加图层

<P>CFileDialog dlg(TRUE,NULL,NULL,OFN_HIDEREADONLY,"ERSI ShapeFile (*.shp)|*.shp");
    if(dlg.DoModal()==IDOK)
 {</P>
<P>  CString str,str2;
  str=dlg.GetPathName();
 
    int i=str.ReverseFind('\\');
    
  str=str.Left(i);      
  str2=dlg.GetFileTitle();
     CMoDataConnection conn;
 if (!conn.CreateDispatch(TEXT("MapObjects2.DataConnection")))
  throw "unable to create MapObjects2.DataConnection";
 conn.SetDatabase(str);
 
 if (!conn.Connect())
  throw "unable to connect to database";</P>
<P> // Add layer specified by path
 CMoLayers layers(m_map.GetLayers());
 CMoMapLayer layer;
  if (!layer.CreateDispatch(TEXT("MapObjects2.MapLayer")))
  throw "unable to create MapObjects2.MapLayer";
 layername=str2;
 CMoGeoDataset geoDataset(conn.FindGeoDataset(str2));
 layer.SetGeoDataset(geoDataset);
 </P>
<P> layers.Add(layer);
  
 }</P>

支持，来点说明会好点