如何在C#中設(shè)置和使用全局鉤子

c#
小樊
85
2024-09-11 02:22:34

在C#中設(shè)置和使用全局鉤子通常涉及到使用Windows API函數(shù)，這需要P/Invoke

  1. 首先，添加以下命名空間引用：
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;
  1. 定義一些必要的常量和委托：
public class GlobalHook
{
    public const int WH_KEYBOARD_LL = 13;
    public const int WM_KEYDOWN = 0x0100;
    public const int WM_KEYUP = 0x0101;

    public delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
}
  1. 導(dǎo)入所需的Windows API函數(shù)：
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook, GlobalHook.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);
  1. 創(chuàng)建鉤子并處理鍵盤(pán)事件：
public class GlobalHook
{
    // ... 其他代碼 ...

    private IntPtr _hookID = IntPtr.Zero;
    private GlobalHook.LowLevelKeyboardProc _proc;

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

    public void UnsetHook()
    {
        UnhookWindowsHookEx(_hookID);
    }

    private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0 && (wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_KEYUP))
        {
            int vkCode = Marshal.ReadInt32(lParam);
            Console.WriteLine((Keys)vkCode);
        }

        return CallNextHookEx(_hookID, nCode, wParam, lParam);
    }
}
  1. 最后，在你的程序中使用這個(gè)全局鉤子：
public static void Main()
{
    GlobalHook globalHook = new GlobalHook();
    globalHook.SetHook();

    Application.Run(); // 保持程序運(yùn)行，直到用戶關(guān)閉它

    globalHook.UnsetHook();
}

請(qǐng)注意，全局鉤子可能會(huì)影響系統(tǒng)性能，因此請(qǐng)謹(jǐn)慎使用。此外，這種方法可能不適用于所有場(chǎng)景，特別是在某些安全策略嚴(yán)格的環(huán)境中。在實(shí)際應(yīng)用中，請(qǐng)確保遵循最佳實(shí)踐和適當(dāng)?shù)陌踩胧?/p>

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