求 DrawDibDraw在C#的用法，谁有例子

求 DrawDibDraw的用法，谁有例子，我总是返回 false
不知道哪里错了
 public Rectangle SrcRect, DstRect;
        IntPtr hdd;               //DrawDibOpen()返回的句柄
        //public Control Control;
        public BITMAPINFOHEADER BITMAPINFOHEADER;        //public IntPtr Handle
        //{
        //    get { return this.hdd; }
        //}        public DrawDib()
        {
            this.SrcRect = this.DstRect = new Rectangle(0, 0, 160, 120);
        }        public void Open(IntPtr hdc)
        {
            this.hdd = DrawDibOpen();
            showVo s = new showVo();
            BITMAPINFOHEADER = s.IniVideoRender();
            bool b = DrawDibBegin(hdd, hdc, this.DstRect.Width, this.DstRect.Height, ref this.BITMAPINFOHEADER, this.SrcRect.Width, this.SrcRect.Height, 0);
 
        }public BITMAPINFOHEADER IniVideoRender()
        {
            BITMAPINFOHEADER bmi = new BITMAPINFOHEADER();            bmi.biCompression = (int)BI.BI_BITFIELDS;//压缩格式
            bmi.biWidth = 320;          //以像素为单位的图像宽度*
            bmi.biHeight = 240;         //以像素为单位的图像长度*
            bmi.biPlanes = 1;
            bmi.biBitCount = 24;
            bmi.biXPelsPerMeter = 0;
            bmi.biYPelsPerMeter = 0;
            bmi.biClrUsed = 0;
            bmi.biClrImportant = 0;
            bmi.biSizeImage = 230400;//;57600
            bmi.biSize = Marshal.SizeOf(bmi);
            dd = new DrawDib();
            dd.BITMAPINFOHEADER = bmi;
            return bmi;
            //dd.Open();
            //try
            //{
            //}
            //catch { }
        }QQ：75786749
MSN：[email protected]