public static void DoFlashScreen() { // Ref: // http://stackoverflow.com/questions/14385838/draw-on-screen-without-form // http://stackoverflow.com/questions/2527679/how-to-clean-up-after-myself-when-drawing-directly-to-the-screen WIN32_API.SIZE size; size.cx = WIN32_API.GetSystemMetrics(WIN32_API.SM_CXSCREEN); size.cy = WIN32_API.GetSystemMetrics(WIN32_API.SM_CYSCREEN); IntPtr hDC = WIN32_API.GetDC(WIN32_API.GetDesktopWindow()); Graphics g = Graphics.FromHdc(hDC); SolidBrush b = new SolidBrush(Color.White); g.FillRectangle(b, new Rectangle(0, 0, size.cx, size.cy)); g.Dispose(); WIN32_API.ReleaseDC(WIN32_API.GetDesktopWindow(), hDC); WIN32_API.InvalidateRect(IntPtr.Zero, IntPtr.Zero, true); }
public static Bitmap DoScreenShot() { // Ref: http://stackoverflow.com/questions/158151/how-can-i-save-a-screenshot-directly-to-a-file-in-windows WIN32_API.SIZE size; size.cx = WIN32_API.GetSystemMetrics(WIN32_API.SM_CXSCREEN); size.cy = WIN32_API.GetSystemMetrics(WIN32_API.SM_CYSCREEN); IntPtr hDC = WIN32_API.GetDC(WIN32_API.GetDesktopWindow()); IntPtr hMemDC = WIN32_API.CreateCompatibleDC(hDC); IntPtr m_HBitmap = WIN32_API.CreateCompatibleBitmap(hDC, size.cx, size.cy); if (m_HBitmap == IntPtr.Zero) { return(null); } IntPtr hOld = (IntPtr)WIN32_API.SelectObject(hMemDC, m_HBitmap); WIN32_API.BitBlt(hMemDC, 0, 0, size.cx, size.cy, hDC, 0, 0, WIN32_API.SRCCOPY); WIN32_API.SelectObject(hMemDC, hOld); WIN32_API.DeleteDC(hMemDC); WIN32_API.ReleaseDC(WIN32_API.GetDesktopWindow(), hDC); return(System.Drawing.Image.FromHbitmap(m_HBitmap)); }