CSGL Save OpenGL Frame as picture

[MIrchhh]

Hello,

I saw a problem about that. And I tried below code to do it. But all of informations are gotten as 0. I could not save frame as Picture. Could you help me? I use C# CSGL.

public void saveScene()
{
Size s = Size;

Bitmap b = new Bitmap(s.Width, s.Height,
PixelFormat.Format32bppArgb);
BitmapData bd = b.LockBits(new Rectangle(0, 0, s.Width, s.Height),
ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
GL.glReadPixels(0, 0, s.Width, s.Height, GL.GL_BGRA_EXT,
GL.GL_UNSIGNED_BYTE, bd.Scan0);
b.UnlockBits(bd);
//b.RotateFlip();
b.Save(@"c:\test.bmp", ImageFormat.Bmp);
}