在C#中使用全局鼠标、键盘Hook

在C#中使用全局鼠标、键盘Hook需要使用Win32 API来实现，以下是一个简单的示例代码：

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace GlobalHookDemo
{
    class Program
    {
        private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

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

        [DllImport("user32.dll", SetLastError = true)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

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

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);

        private const int WH_KEYBOARD_LL = 13;
        private static LowLevelKeyboardProc _proc = HookCallback;
        private static IntPtr _hookID = IntPtr.Zero;

        static void Main(string[] args)
        {
            _hookID = SetHook(_proc);
            Console.WriteLine("Global keyboard hook installed.");
            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
            UnhookWindowsHookEx(_hookID);
        }

        private static 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 static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && wParam == (IntPtr)0x100)
            {
                int vkCode = Marshal.ReadInt32(lParam);
                Console.WriteLine((Keys)vkCode);
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }
    }
}

这个示例代码可以监听全局键盘事件并输出键码。如果需要监听鼠标事件，可以使用`SetWindowsHookEx`函数的第一个参数`idHook`设置为`WH_MOUSE_LL`。需要注意的是，全局Hook会影响系统性能，使用时需要谨慎。