C#如何屏蔽系统组合键

Question

if (e.Alt && e.KeyCode = Keys.Tab)
            {
                e.Handled = true;
            }
if(e.Alt && e.keyCode = Keys.F4)
{
    e.Handled = true;
}为什么它只能屏蔽alt+F4,其他的用这种方法写就屏蔽不掉?

Answer 1

屏蔽功能键Shift,Alt,Ctrl  
  <script>  
  function   look(){    
  if(event.shiftKey)    
  alert("禁止按Shift键!");   //可以换成ALT　CTRL  
  }    
  document.onkeydown=look;    
  </script>   

Answer 2

这个是ASP.NET吧,我弄的是C#.ctrl+alt+delete 怎么屏蔽掉

Answer 3

老喜欢用.net来做一些其不擅长的事，这种事还是C+比较擅长。

Answer 4

呵呵,问题解决了发给大家看看!谢谢个位的支持:using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Diagnostics;
using Microsoft.Win32;namespace WindowsApplication1
{
    public partial class Form2 : Form
    {
        //委托 
        public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
        static int hHook = 0;
        public const int WH_KEYBOARD_LL = 13;        //LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。 
        HookProc KeyBoardHookProcedure;        //键盘Hook结构函数 
        [StructLayout(LayoutKind.Sequential)]
        public class KeyBoardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }
        #region DllImport
        //设置钩子 
        [DllImport("user32.dll")]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        //抽掉钩子 
        public static extern bool UnhookWindowsHookEx(int idHook);
        [DllImport("user32.dll")]
        //调用下一个钩子 
        public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);        [DllImport("kernel32.dll")]
        public static extern int GetCurrentThreadId();        [DllImport("kernel32.dll")]
        public static extern IntPtr GetModuleHandle(string name);        public void Hook_Start()
        {
            // 安装键盘钩子 
            if (hHook == 0)
            {
                KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);                //hHook = SetWindowsHookEx(2, 
                //            KeyBoardHookProcedure, 
                //          GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), GetCurrentThreadId());                 hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
                          KeyBoardHookProcedure,
                        GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);                //如果设置钩子失败. 
                if (hHook == 0)
                {
                    Hook_Clear();
                    //throw new Exception("设置Hook失败!"); 
                }
            }
        }        //取消钩子事件 
        public void Hook_Clear()
        {
            bool retKeyboard = true;
            if (hHook != 0)
            {
                retKeyboard = UnhookWindowsHookEx(hHook);
                hHook = 0;
            }
            //如果去掉钩子失败. 
            if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed.");
        }        //这里可以添加自己想要的信息处理 
        public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
        {
            if (nCode >= 0)
            {
                KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
                if (kbh.vkCode == 91)  // 截获左win(开始菜单键)
                {
                    return 1;
                }
                if (kbh.vkCode == 92)// 截获右win
                {
                    return 1;
                }
                if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control) //截获Ctrl+Esc
                {
                    return 1;
                }
                if (kbh.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt)  //截获alt+f4
                {
                    return 1;
                }
                if (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+tab
                {
                    return 1;
                }
                if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift) //截获Ctrl+Shift+Esc
                {
                    return 1;
                }
                if (kbh.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Alt)  //截获alt+空格
                {
                    return 1;
                }
                if (kbh.vkCode == 241)                  //截获F1
                {
                    return 1;
                }
                if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete)      //截获Ctrl+Alt+Delete
                {
                    return 1;
                }
                //if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift)      //截获Ctrl+Shift
                //{
                //    return 1;
                //}
              
                //if (kbh.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt)  //截获Ctrl+Alt+空格
                //{
                //    return 1;
                //}
            }
            return CallNextHookEx(hHook, nCode, wParam, lParam);
        }        #endregion        public Form2()
        {
            InitializeComponent();
        }
        
        private void Form2_Load(object sender, EventArgs e)
        {
            Hook_Start();            //通过修改注册表来屏蔽任务管理器
            //try
            //{
            //    RegistryKey r = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System", true);
            //    r.SetValue("DisableTaskMgr", "1");   //屏蔽任务管理器
            //}
            //catch
            //{
            //    RegistryKey r = Registry.CurrentUser.CreateSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System");
            //    r.SetValue("DisableTaskMgr", "0");
            //}
        }        private void Form2_FormClosing(object sender, FormClosingEventArgs e)
        {
            Hook_Clear();
        }        private void Form2_MouseMove(object sender, MouseEventArgs e)
        {
            System.Windows.Forms.Cursor.Clip = new Rectangle(this.Location, this.Size); //控制鼠标在窗口范围内
        }
    }
}

Answer 5

           if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete)      //截获Ctrl+Alt+Delete 
                { 
                    return 1; 
                } 
管用吗这个?

Answer 6

只有用hook，管理器是系统调用的。它获取c+a+d是通过钩子的，处理的顺序在你的程序之前