StandByPreventor.cs

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

namespace StandByPreventor
{
    class Program
    {
        static void Main(string[] args)
        {
            SetThreadExecutionState(ExecutionState.SystemRequired | ExecutionState.Continuous);
        }

        [DllImport("kernel32.dll")]
        extern static ExecutionState SetThreadExecutionState(ExecutionState esFlags);

    }

    [FlagsAttribute]
    public enum ExecutionState : uint
    {
        // 関数が失敗した時の戻り値
        Null = 0,
        // スタンバイを抑止
        SystemRequired = 1,
        // 画面OFFを抑止
        DisplayRequired = 2,
        // 効果を永続させる。ほかオプションと併用する。
        Continuous = 0x80000000,
    }

}