static ScreenGrab Grab(int left, int top, int width, int height)
{
using (System.Drawing.Bitmap screenBmp = BitBltGrab(left, top, width, height))
{
IntPtr hBitmap = screenBmp.GetHbitmap();
BitmapSource image = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
Win.DeleteObject(hBitmap);
return(new ScreenGrab()
{
Image = image, Time = DateTime.Now, TopLeft = new Point(left, top)
});
}
}
/// <summary>
/// Grabs the specified area of the screen including alpha blended windows on top such as tool tips and menus.
/// IMPORTANT: You must call dispose on the bitmap returned by this function as soon as you are done with it.
/// </summary>
private static System.Drawing.Bitmap BitBltGrab(int left, int top, int width, int height)
{
IntPtr hDesktop = Win.GetDesktopWindow();
IntPtr dcDesktop = Win.GetWindowDC(hDesktop);
IntPtr dcTarget = Win.CreateCompatibleDC(dcDesktop);
IntPtr hTargetBitmap = Win.CreateCompatibleBitmap(dcDesktop, width, height);
IntPtr hOldBitmap = Win.SelectObject(dcTarget, hTargetBitmap);
bool success = Win.BitBlt(dcTarget, 0, 0, width, height, dcDesktop, left, top, System.Drawing.CopyPixelOperation.SourceCopy | System.Drawing.CopyPixelOperation.CaptureBlt);
System.Drawing.Bitmap bitmap = System.Drawing.Bitmap.FromHbitmap(hTargetBitmap);
Win.SelectObject(dcTarget, hOldBitmap);
Win.DeleteObject(hTargetBitmap);
Win.DeleteDC(dcTarget);
Win.ReleaseDC(hDesktop, dcDesktop);
return(bitmap);
}