code/Device/Screen.cs

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using System;
using System.Collections.Generic;
using System.Text;

namespace Sylloge.Device
{
    public static class Screen
    {
        public static System.Drawing.Image CaptureDesktop()
        {
            return Sylloge.Device.Screen.CaptureObject(Sylloge.WinAPI.User32.GetDesktopWindow());
        }

        public static System.Drawing.Image CaptureObject(IntPtr handle)
        {
            try {
                // get te hDC of the target window
                IntPtr Source = Sylloge.WinAPI.User32.GetWindowDC(handle);
                // get the size
                Sylloge.WinAPI.Rectangle WindowRectangle = new Sylloge.WinAPI.Rectangle();
                Sylloge.WinAPI.User32.GetWindowRect(handle, ref WindowRectangle);
                int Width = WindowRectangle.Right - WindowRectangle.Left;
                int Height = WindowRectangle.Bottom - WindowRectangle.Top;
                // create a device context we can copy to
                IntPtr Destination = Sylloge.WinAPI.GDI.CreateCompatibleDC(Source);
                // create a bitmap we can copy it to,
                // using GetDeviceCaps to get the width/height
                IntPtr BitmapPtr = Sylloge.WinAPI.GDI.CreateCompatibleBitmap(Source, Width, Height);
                // select the bitmap object
                IntPtr OldPtr = Sylloge.WinAPI.GDI.SelectObject(Destination, BitmapPtr);
                // bitblt over
                Sylloge.WinAPI.GDI.BitBlt(Destination, 0, 0, Width, Height, Source, 0, 0, Sylloge.WinAPI.Constants.SRCCOPY);
                // restore selection
                Sylloge.WinAPI.GDI.SelectObject(Destination, OldPtr);
                // clean up
                Sylloge.WinAPI.GDI.DeleteDC(Destination);
                Sylloge.WinAPI.User32.ReleaseDC(handle, Source);
                // get a .NET image object for it
                System.Drawing.Image Value = System.Drawing.Image.FromHbitmap(BitmapPtr);
                // free up the Bitmap object
                Sylloge.WinAPI.GDI.DeleteObject(BitmapPtr);
                return Value;
            } catch (Exception ex) {
                Sylloge.App.Out(ex);
            }
            return null;
        }
    }
}