添加图层，并设置属性值的代码

最新推荐文章于 2020-12-21 03:51:24 发布

iteye_19488

最新推荐文章于 2020-12-21 03:51:24 发布

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文章标签： C C++ C# F#

本文介绍了一个用于地图应用程序中添加基本资源的功能实现。该工具允许用户通过点击地图来指定资源的位置，并将这些信息保存到数据库中。同时，文章还详细描述了如何创建新的图层和数据集，以及如何在图层上添加符号化的特征。

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void CAddBasicResourceTool::OnMouseDownMap(short Button, short Shift, float X, float Y)
{

CMapXFeature ftr;

CMapXStyle style;

CMapXLayerInfo LayerInfo ;

CMapXFields MapFields ;

CMapXDataset ds ;

CMapXLayer layer ;

int C_ID ;

COleVariant VT_Layer ;

TB_ResourceShare * tb_ResourceShare = NULL ;

if ( !m_pView ) return ;

float screenX,screenY ;
double mapX,mapY ;

screenX = X;

screenY = Y;

CHtMapX & m_MapX = m_pView->GetMapX() ;

if ( m_MapX.GetCurrentTool() == MAP_ADDBASICRESOURCE_TOOL ) {

m_MapX.ConvertCoord(&screenX,&screenY,&mapX,&mapY,miScreenToMap);

CAddResourceDlg dlgAddResource(m_pView) ;

  if ( dlgAddResource.DoModal() == IDC_BTN_SUBMIT ) {

   //ÔÚÕâÀïÏòÊý¾Ý¿âÀïÃæÌí¼ÓÊý¾Ý
   tb_ResourceShare = dlgAddResource.GetResourceShare() ;
   tb_ResourceShare->F_Coord_X = mapX ;
   tb_ResourceShare->F_Coord_Y = mapY ;

CMainFrame * m_pMainFrame = (CMainFrame *)AfxGetMainWnd() ;

   if ( ( C_ID = m_pMainFrame->g_AdoTool.AddOneRecord( *tb_ResourceShare ) ) < 0 ) {
    MessageBox( NULL , "Ôö¼ÓÊ§°Ü" , "",MB_OK);
    return;
   }
   TRACE("Äú½«ÒªÌí¼ÓÒ»¸öµã");

  }
  else
   return ;

try{

   if (ftr.CreateDispatch(ftr.GetClsid())){

    ftr = m_MapX.GetFeatureFactory().CreateSymbol() ;

    style = ftr.GetStyle() ;

    style.SetSymbolBitmapName("CAR1-32.BMP");

    style.SetSymbolBitmapSize( 32 );

    style.SetSymbolBitmapTransparent( TRUE ) ;

    ftr.SetStyle( style ) ;

    ftr.GetPoint().Set( mapX , mapY ) ;

    if ( !m_MapX.LayerExist( LAYER_BASICRESOURCE ) ) {

     LayerInfo.CreateDispatch( LayerInfo.GetClsid() ) ;
     MapFields.CreateDispatch( MapFields.GetClsid() );

     MapFields.AddIntegerField( "C_ID" , TRUE ) ;
     MapFields.AddStringField( "Name" , 32 ) ;

     COleVariant vFields;
     vFields.vt = VT_DISPATCH ;
     vFields.pdispVal = MapFields;
     vFields.pdispVal->AddRef();

     LayerInfo.SetType( miLayerInfoTypeNewTable );
     LayerInfo.AddParameter("Filespec" , COleVariant(m_pLayerFilePath) );
     LayerInfo.AddParameter("Name" , COleVariant(LAYER_BASICRESOURCE) );
     LayerInfo.AddParameter("Fields", vFields );

     layer = m_MapX.GetLayers().Add( LayerInfo );

     VT_Layer.vt = VT_DISPATCH ;
     VT_Layer.pdispVal = layer ;
     VT_Layer.pdispVal->AddRef();

     ds = m_MapX.GetDatasets().Add( miDataSetLayer , VT_Layer , DS_BASICRESOURCE ) ;

     ((CMainFrame *)AfxGetMainWnd())->GetEnargEyeForm()->ListMapxLayers(&m_MapX);

    }

layer = m_MapX.GetLayers().Item( LAYER_BASICRESOURCE ) ;

    layer.SetEditable(TRUE);

    VT_Layer.vt = VT_DISPATCH ;
    VT_Layer.pdispVal = layer ;
    VT_Layer.pdispVal->AddRef();

ds = m_MapX.GetDatasets().Item( DS_BASICRESOURCE ) ;

    CMapXFeature feature = m_MapX.GetLayers().Item( LAYER_BASICRESOURCE ).AddFeature( ftr ) ;

    char sCID[10];
    itoa( C_ID , sCID , 10 ) ;

/* 这一种方法也可以，但本人不喜欢

    layer.SetKeyField("C_ID");
    feature.SetKeyValue( sCID ) ;
    feature.Update();

    layer.SetKeyField("Name");
    feature.SetKeyValue( tb_ResourceShare->SV_Name );
    feature.Update();
*/

    COleVariant VTFeature;
    VTFeature.vt = VT_DISPATCH ;
    VTFeature.pdispVal = feature.m_lpDispatch;
    VTFeature.pdispVal->AddRef();

    CMapXRowValues RowValues = ds.GetRowValues( VTFeature ) ;
    RowValues.Item("C_ID").SetValue( COleVariant(sCID) ) ;
    RowValues.Item("Name").SetValue( COleVariant(tb_ResourceShare->SV_Name) ) ;
    feature.Update( TRUE , RowValues ); //这一句很重要，一定要这样写，不然写不进数据

   }
  }
  catch(COleDispatchException* e) {
   e->ReportError();
   e->Delete();
  } catch(COleException* e) {
   e->ReportError();
   e->Delete();
  }
}

}