VC+MapX 在临时图层中添加点图元

//创建点图元
    CMapXPoint point;
    point.CreateDispatch(point.GetClsid());
    point.Set(m_dMapXX,m_dMapXY);
    //创建图元样式
    CMapXStyle style;
    style.CreateDispatch(style.GetClsid());
    style.SetSymbolType(miSymbolTypeBitmap);
    style.SetSymbolBitmapSize(10);
    style.SetSymbolBitmapName(_T("camera.bmp"));
    //设置MapX不进行自动更新
    m_ctrlMapX.SetAutoRedraw(FALSE);
    //设置图层可写
    pLayer->SetEditable(TRUE);
    //创建特征对象
    VARIANT varPoint;
    VARIANT varStyle;
    varPoint.vt = VT_DISPATCH;
    varPoint.pdispVal = point;
    varStyle.vt = VT_DISPATCH;
    varStyle.pdispVal = style;
    CMapXFeatureFactory factory = m_ctrlMapX.GetFeatureFactory();
    CMapXFeature feature = factory.CreateSymbol(varPoint,varStyle);
    //添加到图层
    pLayer->AddFeature(feature);
    pLayer->Refresh();
    //设置MapX进行自动更新
    m_ctrlMapX.SetAutoRedraw(TRUE);
    //设置图层不可写
    pLayer->SetEditable(FALSE);