【屏蔽系统组合键】Hook键盘钩子(屏蔽键盘按键)

这要写可以屏蔽除calt+alt+del的任何按键，包括各种组合键

[C#] 纯文本查看 复制代码

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

namespace LockScreen
{
    class MyHook
    {
        //消息函数的委托
        public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
        static int hHook = 0;
        public const int WH_KEYBOARD_LL = 13;//底层键盘钩子
        HookProc KeyBoardHookProcedure;

        //按键信息结构
        [StructLayout(LayoutKind.Sequential)]
        public class KeyBoardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }

        //安装钩子
        [DllImport("user32.dll")]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

        //卸载钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(int idHook);

        //下一个钩挂的函数
        [DllImport("user32.dll")]
        public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);

        //返回当前线程 ID
        [DllImport("kernel32.dll")]
        public static extern int GetCurrentThreadId();

        //得到模块的句柄
        [DllImport("kernel32.dll")]
        public static extern IntPtr GetModuleHandle(string name);

        //安装钩子
        public void InsertHook()
        {
            if (hHook == 0)
            {
                KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);
                hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
                          KeyBoardHookProcedure,
                        GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);
                if (hHook == 0)
                {
                    UnHook();
                    throw new Exception("设置Hook失败!");
                }
            }
        }

        //卸载钩子
        public void UnHook()
        {
            bool retKeyboard = true;
            if (hHook != 0)
            {
                retKeyboard = UnhookWindowsHookEx(hHook);
                hHook = 0;
            }
            if (!retKeyboard) throw new Exception("卸载Hook失败!");
        }

        //按键消息的处理函数
        public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
        {
            if (nCode >= 0)
            {
                //KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
                //添加自己的判断语句，如果符合要求的按键，就 return 1; 
                //没有判断直接 return 1;那么就屏蔽所有按键除了ctrl+alt+del
                
                return 1;
            }
            return CallNextHookEx(hHook, nCode, wParam, lParam);
        }
    }
}

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