C# 不善於離別 , 為何要說再見

在一些應用上,有時我們會希望能控制螢幕的休眠而不是螢幕保護程式(r就是螢幕全黑,燈變橙色)

可以用下列方式做到:

        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);

        static readonly IntPtr HWND_BROADCAST = new IntPtr(0xffff);
        const uint WM_SYSCOMMAND = 0x0112;
        const int SC_MONITORPOWER = 0xf170;

        public static void TurnOn()
        {
            SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, -1);
        }

        public static void TurnOff()
        {
            SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2);
        }