using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
[DllImport( "user32.dll" )]
static extern IntPtr GetDC( IntPtr hWnd );
[DllImport( "user32.dll" )]
static extern int ReleaseDC( IntPtr hWnd, IntPtr hDC );
[DllImport( "gdi32.dll" )]
static extern int GetPixel( IntPtr hDC, int x, int y );
[DllImport( "gdi32.dll" )]
static extern int SetPixel( IntPtr hDC, int x, int y, int color );
static public Color GetPixel( Control control, int x, int y )
{
Color color = Color.Empty;
if (control != null)
{
IntPtr hDC = GetDC( control.Handle );
int colorRef = GetPixel( hDC, x, y );
color = Color.FromArgb(
(int)(colorRef & 0x000000FF),
(int)(colorRef & 0x0000FF00) >> 8,
(int)(colorRef & 0x00FF0000) >> 16 );
ReleaseDC( control.Handle, hDC );
}
return color;
}
static public void SetPixel( Control control, int x, int y, Color color )
{
if (control != null)
{
IntPtr hDC = GetDC( control.Handle );
int argb = color.ToArgb();
int colorRef =
(int)((argb & 0x00FF0000) >> 16) |
(int)(argb & 0x0000FF00) |
(int)((argb & 0x000000FF) << 16);
SetPixel( hDC, x, y, colorRef );
ReleaseDC( control.Handle, hDC );
}
}