C# HOOK 键盘事件

wgscd / 2023-08-15 / 原文

C# HOOK 键盘事件

/*
by: wgscd
date:2023-8-15
desc: test hook in c#
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace TestHook
{
    internal class HookHelper
    {
        private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

        private static LowLevelKeyboardProc _proc = HookCallback;

        private const int WH_KEYBOARD_LL = 13;
        private const int WM_KEYDOWN = 0x0100;

        private static IntPtr _hookID = IntPtr.Zero;

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

        public static void SetHook()
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                _hookID = SetWindowsHookEx(WH_KEYBOARD_LL, _proc, curModule.BaseAddress, 0);
            }
        }

        private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
            {
                //打印按下的键，包含组合键
                int vkCode = Marshal.ReadInt32(lParam);
                var combo = Control.ModifierKeys.ToString();//组合键
                if (combo != "None")
                {
                    Debug.Print(combo.Replace(",", "+") + "+" + (Keys)vkCode);
                }
                else
                {
                    Debug.Print("" + (Keys)vkCode);
                }

            }

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

        public static void Unhook()
        {
            UnhookWindowsHookEx(_hookID);
        }



    }
}

调用：

TestHook.SetHook();

在不需要的时候卸载：

Unhook（）