XIMAGEDESC - получение изображения

void MapWidget::DrawMap(QPainter* p, int cx, int cy, int cw, int ch)
{
  if (MapHandle)
  {
    RECT rectDraw;
    rectDraw.left = cx;
    rectDraw.top = cy;
    rectDraw.right = cx + cw;
    rectDraw.bottom = cy + ch;

    if (BitMap)
    {
      XIMAGEDESC xImageDesc;
      xImageDesc.Point = BitMap;                     // Àäðåñ íà÷àëà îáëàñòè ïèêñåëîâ
      xImageDesc.Width = cw;                         // Øèðèíà ñòðîêè â ïèêñåëàõ
      xImageDesc.Height = ch;                        // ×èñëî ñòðîê
      xImageDesc.Depth = MAPDEPTH;                   // Ðàçìåð ýëåìåíòà â áèòàõ (8,15,16,24,32)
      xImageDesc.CellSize = BMCELLSIZE;              // Ðàçìåð ýëåìåíòà(ïèêñåëà) â áàéòàõ
      xImageDesc.RowSize = cw * xImageDesc.CellSize; // Øèðèíà ñòðîêè â áàéòàõ

      RECT mapRect;
      mapRect.left = cx - ScrollArea->horizontalScrollBar()->value();
      mapRect.top = cy - ScrollArea->verticalScrollBar()->value();
      mapRect.right = mapRect.left + cw;
      mapRect.bottom = mapRect.top + ch;

      POINT mapPositionInMapImage;
      mapPositionInMapImage.x = 0;
      mapPositionInMapImage.y = 0;

      if (!ObjectHandle)
      {
        ObjectHandle = mapCreateObject(MapHandle);
        mapRegisterDrawObject(ObjectHandle, 5, LOCAL_VECTOR);

        mapAppendPointPlane(ObjectHandle, 6220600, 7445000);
        mapAppendPointPlane(ObjectHandle, 6220600, 7445100);

        IMGGRAPHICMARKEX graphicMark;
        memset(&graphicMark, 0, sizeof(graphicMark));
        graphicMark.Length = sizeof(graphicMark);
        StrCopy(graphicMark.Name, "/usr/share/gisdesigner/examples/myfirst/bus.png", sizeof(graphicMark.Name));
        graphicMark.Type = 0;  // Òèï ôàéëà (0 - PNG, 1 - BMP, 2 - JPG...
        graphicMark.Width = PIX2MKM(64);
        graphicMark.Height = PIX2MKM(21);
        graphicMark.PosV = PIX2MKM(10);
        graphicMark.PosH = PIX2MKM(32);
        graphicMark.Rotate = 1;  // Óñòàíîâêà âîçìîæíîñòè ïîâîðîòà
        mapAppendDraw(ObjectHandle, IMG_GRAPHICMARK, (char *)&graphicMark);
        mapReadObjectByKey(MapHandle, MapHandle, ObjectHandle, 1, 103959);
      }

      mapClearImageObjects(hScreen, 0);

      if (mapViewImageToXImage(hScreen, &xImageDesc, &mapRect, &mapPositionInMapImage))
      {
          QImage image((uchar *)BitMap, cw, ch, QImage::Format_RGB32);
          p->drawImage(cx, cy, image, 0, 0, cw, ch);
          image.save("C:/test.png");
      }
    }
  }
}

 /// <summary>
    /// Вариант создания изображения с использованием структуры <see cref="XIMAGEDESC"/>
    /// </summary>
    public static XIMAGEDESC CreateXImage(int Heiht, int Width)
    {
        var hMap = mapOpenDataUn(@"reg_russia.sitx", 0);
        var bitmapHandle = mapCreateImageEx(Width, Heiht);
        mapGetViewType(hMap);

        // Описание изображение
        var imageInfo = new XIMAGEDESC()
        { Depth = 32, Width = Width, Height = Heiht, CellSize = 32 / 8 };

        imageInfo.RowSize = imageInfo.CellSize * imageInfo.Width;
        var size = GetSize(imageInfo);

        // Определяем ссылку на массив
        var pointer = Marshal.AllocHGlobal(size);
        imageInfo.Point = pointer;

        // Размер изображения
        var rectInfo = new RECT() { left = 0, right = imageInfo.Width, bottom = imageInfo.Height, top = 0 };
        var pointInfo = new POINT() { x = 0, y = 0 };

        var result = mapViewImageToXImage(bitmapHandle, ref imageInfo, ref rectInfo, ref pointInfo);
        return imageInfo;
    }