/// <summary>
/// Creates a screenshot from a hidden window.
/// </summary>
/// <param name="windowHandle">
/// The handle of the window.
/// </param>
/// <returns>
/// A <see cref="Bitmap"/> of the window.
/// </returns>
public static Bitmap CreateFromHidden(IntPtr windowHandle)
{
Bitmap bmpScreen = null;
try {
Rectangle r;
using (Graphics windowGraphic = Graphics.FromHdc(new IntPtr(NativeWin32.GetWindowDC(windowHandle)))) {
r = Rectangle.Round(windowGraphic.VisibleClipBounds);
}
bmpScreen = new Bitmap(r.Width, r.Height);
using (Graphics g = Graphics.FromImage(bmpScreen)) {
IntPtr hdc = g.GetHdc();
try {
NativeWin32.PrintWindow(windowHandle, hdc, 0);
} finally {
g.ReleaseHdc(hdc);
}
}
} catch {
if (bmpScreen != null)
{
bmpScreen.Dispose();
}
}
return(bmpScreen);
}