winform使用钩子限制windows热键

Posted 2020-11-30 teng-0802

新增类KeybordHookProc

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace HookDemo
{
    /// <summary> 
    /// 这个类可以让你得到一个在运行中程序的所有键盘事件 
    /// 并且引发一个带KeyEventArgs和MouseEventArgs参数的.NET事件以便你很容易使用这些信息 
    /// </summary>
    public class KeyBordHook
    {

        private const byte LLKHF_ALTDOWN = 0x20;
        private const byte VK_CAPITAL = 0x14;
        private const byte VK_ESCAPE = 0x1B;
        private const byte VK_F4 = 0x73;
        private const byte VK_LCONTROL = 0xA2;
        private const byte VK_NUMLOCK = 0x90;
        private const byte VK_RCONTROL = 0xA3;
        private const byte VK_SHIFT = 0x10;
        private const byte VK_TAB = 0x09;
        public const int WH_KEYBOARD = 13;
        private const int WH_MOUSE = 7;
        private const int WH_MOUSE_LL = 14;
        private const int WM_KEYDOWN = 0x100;
        private const int WM_KEYUP = 0x101;
        private const int WM_LBUTTONDBLCLK = 0x203;
        private const int WM_LBUTTONDOWN = 0x201;
        private const int WM_LBUTTONUP = 0x202;
        private const int WM_MBUTTONDBLCLK = 0x209;
        private const int WM_MBUTTONDOWN = 0x207;
        private const int WM_MBUTTONUP = 0x208;
        private const int WM_MOUSEMOVE = 0x200;
        private const int WM_MOUSEWHEEL = 0x020A;
        private const int WM_RBUTTONDBLCLK = 0x206;
        private const int WM_RBUTTONDOWN = 0x204;
        private const int WM_RBUTTONUP = 0x205;
        private const int WM_SYSKEYDOWN = 0x104;
        private const int WM_SYSKEYUP = 0x105;

        //全局的事件 
        public event KeyEventHandler OnKeyDownEvent;
        public event KeyEventHandler OnKeyUpEvent;
        public event KeyPressEventHandler OnKeyPressEvent;

        static int hKeyboardHook = 0; //键盘钩子句柄

        //鼠标常量 
        public const int WH_KEYBOARD_LL = 13; //keyboard hook constant

        HookProc KeyboardHookProcedure; //声明键盘钩子事件类型.

        //声明键盘钩子的封送结构类型 
        [StructLayout(LayoutKind.Sequential)]
        public class KeyboardHookStruct
        {
            public int vkCode; //表示一个在1到254间的虚似键盘码 
            public int scanCode; //表示硬件扫描码 
            public int flags;
            public int time;
            public int dwExtraInfo;
        }

        //装置钩子的函数 
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

        //卸下钩子的函数 
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(int idHook);

        //下一个钩挂的函数 
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);

        //取得当前线程编号  
        [DllImport("kernel32.dll")]
        private static extern int GetCurrentThreadId();

        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        private static extern short GetKeyState(int vKey);


        public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);

        /// <summary> 
        /// 墨认的构造函数构造当前类的实例并自动的运行起来. 
        /// </summary> 
        public KeyBordHook()
        {
            Start();
        }

        //析构函数. 
        ~KeyBordHook()
        {
            Stop();
        }

        /// <summary>
        /// 启动Hook，并用流屏蔽任务管理器
        /// </summary>
        public void Start()
        {
            if (hKeyboardHook == 0)
            {
                //   创建HookProc实例  
                KeyboardHookProcedure = new HookProc(KeyboardHookProc);

                hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD,
                    KeyboardHookProcedure,
                    Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),
                    0);

                //   如果设置钩子失败  
                if (hKeyboardHook == 0)
                {
                    Stop();
                    AppLog.Error("SetWindowsHookEx failed.");
                }

                ////用二进制流的方法打开任务管理器。而且不关闭流.这样任务管理器就打开不了
                //MyFs = new FileStream(Environment.ExpandEnvironmentVariables("%windir%\system32\taskmgr.exe"),
                //    FileMode.Open);
                //byte[] MyByte = new byte[(int)MyFs.Length];
                //MyFs.Write(MyByte, 0, (int)MyFs.Length);
            }
        }

        /// <summary>
        /// 卸载Hook
        /// </summary>
        public void Stop()
        {
            bool retKeyboard = true;

            if (hKeyboardHook != 0)
            {
                retKeyboard = UnhookWindowsHookEx(hKeyboardHook);

                hKeyboardHook = 0;
            }

            //if (null != MyFs)
            //{
            //    MyFs.Close();
            //}

            if (!(retKeyboard))
            {
                AppLog.Error("UnhookWindowsHookEx failed.");
            }
        }

        #region Nested type: KeyMSG

        public struct KeyMSG
        {
            public int dwExtraInfo;
            public int flags;
            public int scanCode;

            public int time;
            public int vkCode;
        }

        #endregion

        /// <summary>
        /// 键盘钩子
        /// </summary>
        /// <param name="nCode"></param>
        /// <param name="wParam"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
        {
            KeyboardHookStruct m = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

            AppLog.Debug($"nCode is :{nCode} -- vkCode is :{m.vkCode}");
            if (m.vkCode == (int)Keys.LWin ||
                m.vkCode == (int)Keys.RWin ||
                m.vkCode == (int)Keys.LWin && m.vkCode == (int)Keys.D ||
                m.vkCode == (int)Keys.RWin && m.vkCode == (int)Keys.D ||
                m.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control ||
                m.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt ||
                m.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Alt ||
                m.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt ||
                m.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift ||
                (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete
            )
            {
                AppLog.Info("hooc is OK");
                return 1;
            }

            return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
        }

    }
}

添加键盘按键触发事件

/// <summary>
/// 键盘按下触发事件
/// </summary>
void kh_OnKeyDownEvent(object sender, KeyEventArgs e)
{

}

键盘钩子的使用

/// <summary>
/// 键盘钩子
/// </summary>
KeyBordHook _keyBordHook;

//键盘钩子实例化
_keyBordHook = new KeyBordHook();
_keyBordHook.OnKeyDownEvent += kh_OnKeyDownEvent;