C# 键盘钩子入门

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最新推荐文章于 2024-03-15 09:13:22 发布

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分类专栏： C# 2014年5月文章标签： c#

本文链接：https://blog.youkuaiyun.com/kingken212/article/details/27118877

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这篇博客介绍了如何在C#中设置键盘钩子，通过在FormMain方法中进行安装，实现对键盘输入的监听和拦截。

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//定义键盘消息结构体
        public struct KeyMSG
        {
            public int vkCode;          //键盘虚拟码（1-254）
            public int scanCode;        //硬件扫描码
            public int flags;           //键盘按下时等于128；键盘抬起时等于0
            public int time;            //windows运行时间
            public int dwExtranInfo;
        }
        //定义变量
        public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
        static int hKeyboardHook = 0;
        HookProc KeyboardHookProcedure;
        //安装钩子（需要命名空间：System.Runtime.InteropServices）
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook,HookProc lpfn,IntPtr hInstance,int threadId);
        //卸载钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(int idHook);
        //继续下一个钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
        //钩子处理，就是钩子要做的事情
        private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
        {
            if (nCode >= 0)
            {
                //将lParam数据转换成键盘消息
                KeyMSG m = (KeyMSG)Marshal.PtrToStructure(lParam, typeof(KeyMSG));
                if (m.flags==0&& m.vkCode == (int)(Keys.F2))//如果按了快捷键F2，则运行下面代码
                {
                    ToolStripMenuItemScreenCopy_Click(this,null);
                    return 1;
                }
                else if (m.flags == 0 && m.vkCode == (int)(Keys.F3))//按了F3快捷键
                {
                    ToolStripMenuItemScreenPen_Click(this, null);
                    return 1;
                }
                //如果返回1，则结束消息，这个消息到此为止，不再传递；如果返回0或调用CallNextHookEx函数则消息出了
                //这个钩子继续往下传递
                return 0;
            }
            return CallNextHookEx(hKeyboardHook,nCode,wParam,lParam);
        }
        //安装钩子
        public void HookStart()
        {
            if (hKeyboardHook == 0)
            {
                //创建HookProc实例
                KeyboardHookProcedure = new HookProc(KeyboardHookProc);
                //设置线程钩子，需要命名空间：System.Reflection
                hKeyboardHook = SetWindowsHookEx(13,KeyboardHookProcedure,Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),0);
                //设置钩子失败
                if (hKeyboardHook == 0)
                {
                    HookStop();
                    throw new Exception("SetWindowsHookEx failed.");
                }
            }
        }
        //卸载钩子
        public void HookStop()
        {
            bool retKeyBoard = true;
            if (hKeyboardHook != 0)
            {
                retKeyBoard = UnhookWindowsHookEx(hKeyboardHook);
                hKeyboardHook = 0;
            }
            if (!retKeyBoard)
                throw new Exception("UnhookWindowsHookEx failed.");
        }

在FormMain（）中安装钩子

public FormMain()
        {
            InitializeComponent();
            //安装钩子
            try
            {
                HookStart();
            }
            catch (Exception ex)
            {
                MessageBox.Show("钩子安装失败！提示信息："+ex.Message);
            }
        }

在FormMain_FormClosed()中卸载钩子

private void FormMain_FormClosed(object sender, FormClosedEventArgs e)
        {
           
            //卸载钩子
            try
            {
                HookStop();
            }
            catch (Exception ex)
            {
                MessageBox.Show("钩子卸载失败！提示信息："+ex.Message);
            }
        }