c#中，从OpenGL缓存利用glReadPixels读取出RGB像素，生成BMP出错，求解决

Question

我想从OpenGL缓存中读取图片，然后保存到本地            
          // 获得客户区矩形
          [DllImport("user32.dll")]
          public static extern int GetClientRect(IntPtr hWnd, out RECT lpRect);
          // 矩形结构
          [StructLayout(LayoutKind.Sequential)]
           public struct RECT
            {
              public int left;
              public int top;
              public int right;
              public int bottom;
            }            IntPtr hwnd = this.Handle;
            RECT rc;
            GetClientRect(hwnd,out rc);
            int uWidth=rc.right-rc.left,uHeight=rc.bottom-rc.top;
            //分配BMP图片所需空间 
            byte [] pImage = new byte[uWidth * uHeight * 3];
             //uint [] pImage= new uint[uWidth * uHeight * 3];
            // 读取屏幕像素 
            CsGL.OpenGL.GL.glPixelStorei(GL.GL_PACK_ALIGNMENT, 1); 
            CsGL.OpenGL.GL.glReadPixels(0, 0, uWidth, uHeight, GL.GL_RGB, GL.GL_UNSIGNED_BYTE, pImage);
            CsGL.OpenGL.GL.glPixelStorei(GL.GL_PACK_ALIGNMENT, 1); 
           
      下面怎么写？我是这样写的，很笨拙的办法 
           Bitmap bit = new Bitmap(uWidth, uHeight);
           int i = 0;
           for(int k=0;k<uWidth;k++)
           {
               for(int j=0;j<uHeight;j++)
                 {
                     //因为得到的是BGR像素，所以这里反过来
                     bit.SetPixel(k, j, Color.FromArgb(pImage[i + 2], pImage[i + 1], pImage[i]));
                         i++;
                 }
           }
           bit.Save("C:\\222.bmp", ImageFormat.Bmp);出来的图是一片黑点点，求高手解决
            

Answer 1

解决了，顺便也把正确的贴出来给大家参考：for (int k =uHeight-1; k>=0; k--)
           {
               for (int j =0; j< uWidth;  j++)
                { 
                    //不需要反过来
                    bit.SetPixel(k, j, Color.FromArgb(pImage[i], pImage[i + 1], pImage[i + 2])); 
                        i++; 
                }