c# 监听键盘和鼠标事件

c# 监听键盘和鼠标事件 -  全局键盘钩子（监听系统级按键）

平台：Windows

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;

public class GlobalKeyboardHook : IDisposable
{
    private const int WH_KEYBOARD_LL = 13;
    private const int WM_KEYDOWN = 0x0100;
    private const int WM_KEYUP = 0x0101;
    private const int WM_SYSKEYDOWN = 0x0104;
    private const int WM_SYSKEYUP = 0x0105;
    
    private LowLevelKeyboardProc _proc;
    private IntPtr _hookID = IntPtr.Zero;
    
    public event EventHandler<KeyEventArgs> KeyDown;
    public event EventHandler<KeyEventArgs> KeyUp;
    
    public GlobalKeyboardHook()
    {
        _proc = HookCallback;
        _hookID = SetHook(_proc);
    }
    
    private IntPtr SetHook(LowLevelKeyboardProc proc)
    {
        using (Process curProcess = Process.GetCurrentProcess())
        using (ProcessModule curModule = curProcess.MainModule)
        {
            return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
                GetModuleHandle(curModule.ModuleName), 0);
        }
    }
    
    private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
    
    private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0)
        {
            int vkCode = Marshal.ReadInt32(lParam);
            
            if (wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN)
            {
                KeyDown?.Invoke(this, new KeyEventArgs((Keys)vkCode));
            }
            else if (wParam == (IntPtr)WM_KEYUP || wParam == (IntPtr)WM_SYSKEYUP)
            {
                KeyUp?.Invoke(this, new KeyEventArgs((Keys)vkCode));
            }
        }
        
        return CallNextHookEx(_hookID, nCode, wParam, lParam);
    }
    
    public void Dispose()
    {
        UnhookWindowsHookEx(_hookID);
    }
    
    [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);
    
    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr GetModuleHandle(string lpModuleName);
}

// 使用全局钩子的示例
public class GlobalHookExample
{
    private GlobalKeyboardHook globalHook;
    
    public void StartListening()
    {
        globalHook = new GlobalKeyboardHook();
        globalHook.KeyDown += OnGlobalKeyDown;
        globalHook.KeyUp += OnGlobalKeyUp;
        
        Console.WriteLine("全局键盘监听已启动...");
        Console.WriteLine("按 ESC 键退出");
        
        // 消息循环（在Windows Forms中不需要）
        Application.Run();
    }
    
    private void OnGlobalKeyDown(object sender, KeyEventArgs e)
    {
        Console.WriteLine($"全局按键按下: {e.KeyCode}");
        
        if (e.KeyCode == Keys.Escape)
        {
            Application.Exit();
        }
    }
    
    private void OnGlobalKeyUp(object sender, KeyEventArgs e)
    {
        Console.WriteLine($"全局按键释放: {e.KeyCode}");
    }
}