在C#中,要編寫高效的全局鉤子代碼,您需要使用Windows API函數(shù)SetWindowsHookEx
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;
public class GlobalHook
{
public enum HookType : int
{
WH_KEYBOARD_LL = 13,
WH_MOUSE_LL = 14
}
public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);
}
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook, GlobalHook.HookProc 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);
public class GlobalHook
{
// ...
private IntPtr _hookID = IntPtr.Zero;
private GlobalHook.HookProc _hookProc;
public void SetHook(HookType hookType, GlobalHook.HookProc hookProc)
{
if (_hookID != IntPtr.Zero) return;
_hookProc = hookProc;
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
_hookID = SetWindowsHookEx((int)hookType, _hookProc, GetModuleHandle(curModule.ModuleName), 0);
}
}
public void RemoveHook()
{
if (_hookID == IntPtr.Zero) return;
UnhookWindowsHookEx(_hookID);
_hookID = IntPtr.Zero;
}
public IntPtr OnHookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode < 0) return CallNextHookEx(_hookID, nCode, wParam, lParam);
// 在此處處理鉤子事件,例如按鍵或鼠標(biāo)事件
// ...
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
}
public partial class MainForm : Form
{
private GlobalHook _globalHook;
public MainForm()
{
InitializeComponent();
_globalHook = new GlobalHook();
_globalHook.SetHook(GlobalHook.HookType.WH_KEYBOARD_LL, KeyboardHookCallback);
}
private IntPtr KeyboardHookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0)
{
Keys key = (Keys)Marshal.ReadInt32(lParam);
Console.WriteLine($"Key: {key}, Param: {wParam}");
}
return _globalHook.OnHookCallback(nCode, wParam, lParam);
}
protected override void OnClosed(EventArgs e)
{
base.OnClosed(e);
_globalHook.RemoveHook();
}
}
這樣,您就可以編寫一個高效的C#全局鉤子代碼。請注意,全局鉤子可能會影響系統(tǒng)性能,因此請謹(jǐn)慎使用。