钩子与API截获

开发平台：

C#

Form1.cs：源码内容

							﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace AutoShutdown
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        DateTime t;
        private void btShutdown_Click(object sender, EventArgs e)
        {
            TimeSpan tp;
            TimeSpan.TryParse(textTime.Text, out tp);
            this.Text = tp.ToString();
            t = DateTime.Now + tp;
            timer1.Enabled = true;
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            textTime.Text = "00:50:00";
        }
        internal const int EWX_SHUTDOWN = 0x00000001;
        internal const int EWX_REBOOT = 0x00000002;
        internal const int EWX_FORCE = 0x00000004;
        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
        internal static extern bool ExitWindowsEx(int flg, int rea);
        private void timer1_Tick(object sender, EventArgs e)
        {
            if (t> DateTime.Now)
            {
                TimeSpan dt = t - DateTime.Now;
                this.label1.Text = (dt).ToString();
            }
            else
            {
                timer1.Enabled = false;
                WindowsExit.PowerOff();
                this.label1.Text = "";
            }
        }
    }
}

						