halcon始终显示十字叉

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void showimage()
{

        if (this.InvokeRequired)//等待异步
        {
            this.BeginInvoke(new show(showimage));
        }
        else
        {
            pp = GetImgdata(mhall);
            HOperatorSet.GenImage1(out mOriImg, "byte", 1280, 1024, pp);
            HOperatorSet.DispObj(mOriImg, WindowHandle);
            HOperatorSet.SetColor(WindowHandle, "red");
            HOperatorSet.SetDraw(WindowHandle, "margin");
            HOperatorSet.DispCross(WindowHandle, ImgH / 2, ImgW / 2, ImgW, 0);
            //PaintCross();
            GC.Collect();
            GC.WaitForPendingFinalizers();
            Application.DoEvents();
        }
    }