public static extern bool GetWindowRect(IntPtr hWnd, out RECT WindowRECT);
public static Rectangle GetWindowRectangle(IntPtr hWnd)
{
RECT rect = new RECT();
GetWindowRect(hWnd, out rect);
return new Rectangle(rect.Left, rect.Top, rect.Right - rect.Left, rect.Bottom - rect.Top);
}
public static extern bool ClipCursor(ref RECT lpRect);