Taking screenshots on windows.

screencapture.cs

public class ScreenCapture
    {
        public Image CaptureScreen()
        {
            return CaptureWindow(User32.GetDesktopWindow());
        }

        public Image CaptureWindow(IntPtr handle)
        {
            var screens = Screen.AllScreens;
            Bitmap shot;
            int height = 0;
            int width = 0;
            foreach (Screen sc in screens)
            {
                if (sc.Bounds.Height > height)
                {
                    height = sc.Bounds.Height;
                }
                width += sc.Bounds.Width;
            }
            shot = new Bitmap(width, height, PixelFormat.Format32bppArgb);
            Graphics gfxScreenshot = Graphics.FromImage(shot);

            int x = 0;
            foreach (Screen sc in screens)
            {
                gfxScreenshot.CopyFromScreen(
                    sc.Bounds.X, 
                    sc.Bounds.Y, 
                    x, 
                    0, 
                    sc.Bounds.Size, 
                    CopyPixelOperation.SourceCopy);
                x += sc.Bounds.Width;
            }

            Image img = shot;
            return img;
        }

        public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format)
        {
            Image img = CaptureWindow(handle);
            img.Save(filename, format);
        }

        public void CaptureScreenToFile(string filename, ImageFormat format)
        {
            Image img = CaptureScreen();
            img.Save(filename, format);
        }

        private class GDI32
        {
            public const int SRCCOPY = 0x00CC0020; // BitBlt dwRop parameter
            [DllImport("gdi32.dll")]
            public static extern bool BitBlt(IntPtr hObject, int nXDest, int nYDest,
                int nWidth, int nHeight, IntPtr hObjectSource,
                int nXSrc, int nYSrc, int dwRop);
            [DllImport("gdi32.dll")]
            public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int nWidth,
               int nHeight);
            [DllImport("gdi32.dll")]
            public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
            [DllImport("gdi32.dll")]
            public static extern bool DeleteDC(IntPtr hDC);
            [DllImport("gdi32.dll")]
            public static extern bool DeleteObject(IntPtr hObject);
            [DllImport("gdi32.dll")]
            public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
        }

        private class User32
        {
            [StructLayout(LayoutKind.Sequential)]
            public struct RECT
            {
                public int left;
                public int top;
                public int right;
                public int bottom;
            }
            [DllImport("user32.dll")]
            public static extern IntPtr GetDesktopWindow();
            [DllImport("user32.dll")]
            public static extern IntPtr GetWindowDC(IntPtr hWnd);
            [DllImport("user32.dll")]
            public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);
            [DllImport("user32.dll")]
            public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect);
        }
    }//ScreenCapture