#region

using System;
using System.Runtime.InteropServices;

#endregion

namespace CSFrameworkV5.Common
{
    /// <summary>
    ///     监视器开关控制
    /// </summary>
    public class MonitorTool
    {
        //系统消息 
        private const uint WM_SYSCOMMAND = 0x112;

        //关闭显示器的系统命令   
        private const int SC_MONITORPOWER = 0xF170;

        //2为PowerOff, 1为省电状态，-1为开机 
        private const int MonitorPowerOff = 2;

        /// <summary>
        ///     关闭显示器
        /// </summary>
        public static void PowerOff(IntPtr hWnd)
        {
            SendMessage(
                hWnd,
                WM_SYSCOMMAND,
                SC_MONITORPOWER,
                2
            );
        }

        /// <summary>
        ///     打开显示器
        /// </summary>
        public static void PowerOn(IntPtr hWnd)
        {
            SendMessage(
                hWnd,
                WM_SYSCOMMAND,
                SC_MONITORPOWER,
                -1
            );
        }

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