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TestProject.zip
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▶ WIN32Helper.cs

using System.Runtime.InteropServices;

namespace TestProject
{
    /// <summary>
    /// WIN32 헬퍼
    /// </summary>
    public static class WIN32Helper
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Import
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Private

        #region 메시지 보내기 - SendMessage(windowHandle, message, wordParameter, longParameter)

        /// <summary>
        /// 메시지 보내기
        /// </summary>
        /// <param name="windowHandle">윈도우 핸들</param>
        /// <param name="message">메시지</param>
        /// <param name="wordParameter">WORD 매개 변수</param>
        /// <param name="longParameter">LONG 매개 변수</param>
        /// <returns>처리 결과</returns>
        [DllImport("user32")]
        private static extern int SendMessage(int windowHandle, short message, int wordParameter, int longParameter);

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// HWND_BROADCAST
        /// </summary>
        private const int HWND_BROADCAST = 0xffff;

        /// <summary>
        /// SC_MONITORPOWER
        /// </summary>
        private const int SC_MONITORPOWER = 0xf170;

        /// <summary>
        /// WM_SYSCOMMAND
        /// </summary>
        private const short WM_SYSCOMMAND = 0x0112;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Public

        #region 모니터 전원 끄기 - MonitorPowerOff()

        /// <summary>
        /// 모니터 전원 끄기
        /// </summary>
        public static void MonitorPowerOff()
        {
            SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, -1);
        }

        #endregion
        #region 모니터 전원 켜기 - MonitorPowerOn()

        /// <summary>
        /// 모니터 전원 켜기
        /// </summary>
        public static void MonitorPowerOn()
        {
            SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2);
        }

        #endregion
    }
}

 

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▶ Program.cs

using System;
using System.Threading;

namespace TestProject
{
    /// <summary>
    /// 프로그램
    /// </summary>
    class Program
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Private

        #region 프로그램 시작하기 - Main()

        /// <summary>
        /// 프로그램 시작하기
        /// </summary>
        private static void Main()
        {
            Console.Title = "SendMessage API 함수 : 모니터 화면 끄기/켜기";

            WIN32Helper.MonitorPowerOff();

            Thread.Sleep(5000);

            WIN32Helper.MonitorPowerOn();
        }

        #endregion
    }
}
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