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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

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

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

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

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