C# 钩子，监控键盘消息。

最新推荐文章于 2023-11-07 17:30:52 发布

qingchouchen

最新推荐文章于 2023-11-07 17:30:52 发布

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分类专栏： C#程序设计文章标签： c# button object user class

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这篇博客详细介绍了如何使用C#编程实现键盘钩子，监控键盘输入消息。通过`SetWindowsHookEx`等WinAPI函数设置和移除钩子，并在回调函数中处理键盘事件。

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

IntPtr CurrHook; //得到钩子句柄

        [DllImport("kernel32.dll")]
        public static extern int GetCurrentThreadId();      //得到线程ID

        [DllImport("user32.dll")]
        //--------开始装钩子HookType:钩子类型,backCall:回调委托,MyNull:当前实例句柄,ThreadId:线程ID
        public static extern IntPtr SetWindowsHookEx(int HookType, KeyBackCall backCall, IntPtr MyNull, int ThreadId);

[DllImport("user32.dll")]
public static extern IntPtr CallNextHookEx(IntPtr CurrHook, int nCode, IntPtr wParam, IntPtr lParam);

[DllImport("user32.dll")]
public static extern void UnhookWindowsHookEx(IntPtr CurrHook);

//----回调的委托
public delegate IntPtr KeyBackCall(int nCode, IntPtr wParam, IntPtr lParam);

        //--------委托事件
        public IntPtr KeyBackCallEvent(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode > 0)
            {
                MessageBox.Show(wParam.ToString());
                return CallNextHookEx(CurrHook, nCode, wParam, lParam);
            }
            return CallNextHookEx(CurrHook, nCode, wParam, lParam);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            CurrHook = SetWindowsHookEx(2, new KeyBackCall(KeyBackCallEvent), IntPtr.Zero, GetCurrentThreadId());

        }

        private void button2_Click(object sender, EventArgs e)
        {
            UnhookWindowsHookEx(CurrHook);

}