C# 屏蔽系統熱鍵

直接上處理類。

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace ShieldHotKeyLibrary
{
    /// <summary>
    /// 熱鍵屏蔽處理類
    /// </summary>
    internal class HotKeyHandler
    {

        public static HotKeyHandler Instance { get; } = new HotKeyHandler();

        private HotKeyHandler()
        {

        }

        #region dll


        [DllImport("ntdll.dll")]
        public static extern int ZwSuspendProcess(IntPtr ProcessId);
        [DllImport("ntdll.dll")]
        public static extern int ZwResumeProcess(IntPtr ProcessId);


        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

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

        // 繼續下一個鉤子 
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);

        // 取得當前線程編號
        [DllImport("kernel32.dll")]
        private static extern int GetCurrentThreadId();

        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        private static extern short GetKeyState(int vKey);



        #endregion

        #region 變量聲明

        public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
        private HookProc KeyboardHookProcedure;

        private const byte LLKHF_ALTDOWN = 0x20;
        private const byte VK_CAPITAL = 0x14;
        private const byte VK_ESCAPE = 0x1B;
        private const byte VK_F4 = 0x73;
        private const byte VK_LCONTROL = 0xA2;
        private const byte VK_NUMLOCK = 0x90;
        private const byte VK_RCONTROL = 0xA3;
        private const byte VK_SHIFT = 0x10;
        private const byte VK_TAB = 0x09;
        private const int WH_KEYBOARD = 13;
        private const int WH_KEYBOARD_LL = 13;
        private const int WH_MOUSE = 7;
        private const int WH_MOUSE_LL = 14;
        private const int WM_KEYDOWN = 0x100;
        private const int WM_KEYUP = 0x101;
        private const int WM_LBUTTONDBLCLK = 0x203;
        private const int WM_LBUTTONDOWN = 0x201;
        private const int WM_LBUTTONUP = 0x202;
        private const int WM_MBUTTONDBLCLK = 0x209;
        private const int WM_MBUTTONDOWN = 0x207;
        private const int WM_MBUTTONUP = 0x208;
        private const int WM_MOUSEMOVE = 0x200;
        private const int WM_MOUSEWHEEL = 0x020A;
        private const int WM_RBUTTONDBLCLK = 0x206;
        private const int WM_RBUTTONDOWN = 0x204;
        private const int WM_RBUTTONUP = 0x205;
        private const int WM_SYSKEYDOWN = 0x104;
        private const int WM_SYSKEYUP = 0x105;
        private static int hKeyboardHook = 0;

        /// <summary>
        /// 按鍵結構體
        /// </summary>
        public struct KeyBoardHookStruct
        {
            public int vkCode;
            int scanCode;
            public int flags;
            int time;
            int dwExtraInfo;
        }

        #endregion


        #region 任務管理器

        /// <summary>
        /// 屏蔽任務管理器
        /// </summary>
        public void SuspendWinLogon()
        {
            Process[] pc = Process.GetProcessesByName("winlogon");
            if (pc.Length > 0)
            {
                ZwSuspendProcess(pc[0].Handle);
            }
        }


        /// <summary>
        /// 恢復任務管理器
        /// </summary>
        public void ResumeWinLogon()
        {
            Process[] pc = Process.GetProcessesByName("winlogon");
            if (pc.Length > 0)
            {
                ZwResumeProcess(pc[0].Handle);
            }
        }


        #endregion

        #region 鍵盤鉤子
        /// <summary>
        /// 鉤子回調函數，在這裏屏蔽熱鍵。
        /// </summary>
        /// <param name="nCode"></param>
        /// <param name="wParam"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
        {
            if (nCode >= 0)
            {
                KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));

                if (
                    //左邊WIN鍵
                    kbh.vkCode == 91 ||
                    //右邊WIN鍵
                    kbh.vkCode == 92 ||
                    //左邊SHIFT鍵
                    kbh.vkCode == 160 ||
                    //右邊SHIFT鍵
                    kbh.vkCode == 161 ||
                    //Ctrl+ESC
                    (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control) ||
                    //ESC + Alt
                    (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Alt) ||
                    //ALT+F4
                    (kbh.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt) ||
                    //Tab + Alt
                    (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt) ||
                    //Ctrl + Alt + Delete
                    (kbh.vkCode == (int)Keys.Delete && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt) ||
                    //Esc + Ctrl + Alt
                    (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt)

                    )
                {
                    return 1;
                }
            }

            return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
        }


        /// <summary>
        /// 啓動鍵盤熱鍵Hook
        /// </summary>
        public void HookStart()
        {
            if (hKeyboardHook == 0)
            {
                // 創建HookProc實例  
                KeyboardHookProcedure = new HookProc(KeyboardHookProc);
                hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD,
                                                 KeyboardHookProcedure,
                                                 Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().ManifestModule),
                                                 0);
                // 如果設置鉤子失敗  
                if (hKeyboardHook == 0)
                {
                    HookStop();
                }
            }
        }



        /// <summary>
        /// 停止鍵盤熱鍵Hook
        /// </summary>
        public void HookStop()
        {
            bool retKeyboard = true;
            if (hKeyboardHook != 0)
            {
                retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
                hKeyboardHook = 0;
            }
            if (!(retKeyboard))
            {
                throw new Exception("UnhookWindowsHookEx Error");
            }
        }

        #endregion



    }
}