public static Bitmap GetScreenShot(IntPtr windowHandle)
{
WindowsFunctions.GetWindowRect(new HandleRef(null, windowHandle), out var rc);
var bmp = new Bitmap(rc.Right - rc.Left, rc.Bottom - rc.Top, PixelFormat.Format32bppArgb);
var gfxBmp = Graphics.FromImage(bmp);
IntPtr hdcBitmap;
try
{
hdcBitmap = gfxBmp.GetHdc();
}
catch
{
return(null);
}
var succeeded = WindowsFunctions.PrintWindow(windowHandle, hdcBitmap, 0x02); /// flag for hardware acceleration window.
gfxBmp.ReleaseHdc(hdcBitmap);
if (!succeeded)
{
gfxBmp.FillRectangle(new SolidBrush(Color.Gray), new Rectangle(Point.Empty, bmp.Size));
}
var hRgn = WindowsFunctions.CreateRectRgn(0, 0, 0, 0);
WindowsFunctions.GetWindowRgn(windowHandle, hRgn);
var region = Region.FromHrgn(hRgn); //err here once
if (!region.IsEmpty(gfxBmp))
{
gfxBmp.ExcludeClip(region);
gfxBmp.Clear(Color.Transparent);
}
gfxBmp.Dispose();
return(bmp);
}