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));
}
