屏蔽键盘

最新推荐文章于 2025-03-31 19:42:25 发布

原创最新推荐文章于 2025-03-31 19:42:25 发布 · 381 阅读

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文章标签：

#keyboard #hook #exception #winform #function #user

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是winform还是web，
winform

C# code


        #region 钩子程序
        //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;
        //}

        //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);
        #endregion

 #region
        //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 ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete)      //截获Ctrl+Alt+Delete 
        //        {
        //            return 1;
        //        }
        //        if (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+tab 
        //        {
        //            return 1;
        //        } 

        //    }
        //    return CallNextHookEx(hHook, nCode, wParam, lParam);
        //}
        #endregion

web的话用js来屏蔽

HTML code


<html>   
  <script>   
  function   KeyDown(){ //屏蔽鼠标右键、Ctrl+n、shift+F10、F5刷新、退格键   
  //alert("ASCII代码是："+event.keyCode);   
      if   ((window.event.altKey)&&   
              ((window.event.keyCode==37)||       //屏蔽   Alt+   方向键   ←   
                (window.event.keyCode==39))){     //屏蔽   Alt+   方向键   →   
            alert("不准你使用ALT+方向键前进或后退网页！");   
            event.returnValue=false;   
            }   
      if   ((event.keyCode==8)     ||                                   //屏蔽退格删除键   
              (event.keyCode==116)||                                   //屏蔽   F5   刷新键   
              (event.keyCode==112)||                                   //屏蔽   F1   刷新键   
              (event.ctrlKey   &&   event.keyCode==82)){   //Ctrl   +   R   
            event.keyCode=0;   
            event.returnValue=false;   
            }   
      if   ((event.ctrlKey)&&(event.keyCode==78))       //屏蔽   Ctrl+n   
            event.returnValue=false;   
      if   ((event.shiftKey)&&(event.keyCode==121))   //屏蔽   shift+F10   
            event.returnValue=false;   
      if   (window.event.srcElement.tagName   ==   "A"   &&   window.event.shiftKey)     
              window.event.returnValue   =   false;     //屏蔽   shift   加鼠标左键新开一网页   
      if   ((window.event.altKey)&&(window.event.keyCode==115)){   //屏蔽Alt+F4   
              window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");   
              return   false;}   
  }   
  function   Showhelp(){   
  alert("呵呵");   
  return   false;   
  }   
  </script>   
  <head>   
  <meta   http-equiv="Content-Language"   content="zh-cn">   
  <meta   http-equiv="Content-Type"   content="text/html;   charset=gb2312">   
  <title>键盘代码</title>   
  <style>   
  <!--   
  body                   {   font-family:   Verdana;   color:   #000080;   font-size:   9pt   }   
  --></style>   
  </head>   
  <body   onkeydown="KeyDown()"   oncontextmenu="event.returnValue=false"   onhelp="Showhelp();return   false;">   
  <p   align="center">请按键盘</p>   
  </body>   
  </html>