基于VC++使用mapwingis控件画矩形，调试时崩溃

Question

我在Mapwingis官网上找到C#的源码，翻译为C++，现已实现加载shapefile文件。

目前想建立新的图层，实现画矩形，为之后的工作做准备。但遇到了坑。
以下代码调试运行到函数m_Map.DrawPolygonEx(m_LayerHandel, xpoint, ypoint, 4, RGB(255,0,0), true)时崩溃掉。
希望能帮助我解决这个问题，非常感谢！！！

void CMapView::map2()
{
    m_LayerHandel = m_Map.NewDrawing(mapWindow::tkDrawReferenceList(1));

    VARIANT* xpoint = new VARIANT[4]; 
    VARIANT* ypoint = new VARIANT[4]; 

    xpoint[0].vt = VT_R8;
    xpoint[0].dblVal = 73.;
    ypoint[0].vt = VT_R8 ;
    ypoint[0].dblVal = 40.;

    xpoint[1].vt = VT_R8 ;
    xpoint[1].dblVal = 135.;
    ypoint[1].vt = VT_R8 ;
    ypoint[1].dblVal = 40.;

    xpoint[2].vt = VT_R8 ;
    xpoint[2].dblVal = 135.;
    ypoint[2].vt = VT_R8 ;
    ypoint[2].dblVal = 35.;

    xpoint[3].vt = VT_R8 ;
    xpoint[3].dblVal = 73.;
    ypoint[3].vt = VT_R8 ;
    ypoint[3].dblVal  = 35.;

    m_Map.DrawPolygonEx(m_LayerHandel, xpoint, ypoint, 4, RGB(255,0,0), true);
    Invalidate();
}

Answer 1

https://www.cnblogs.com/yusiyu/archive/2012/01/31/2333802.html