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Code Snippet - Disable Reboot
Author:WebMaster
Category:Win32API
File Size:~ 1.81 KB
Uploaded at:15-Dec-02 11:14:09 am
Description:
  Don't let the user reboot! Thanks goes to dLightSeeker@hotmail.com for the code snippet.
  
// Use a local keyboard hook to trap ctrl+alt+del keys.

#define _WIN32_WINNT 0x0400
#include <Windows.h>
#include<conio.h>
#include<stdio.h>
#include <stdlib.h>
#include <string.h>


///////////////////////////////////////////////////////////////////////////////


LRESULT CALLBACK LowLevelKeyboardProc(int nCode, 
   WPARAM wParam, LPARAM lParam) {

   BOOL fEatKeystroke = FALSE;
   if (nCode == HC_ACTION) {
      switch (wParam) {
      case WM_KEYDOWN:  case WM_SYSKEYDOWN:
      case WM_KEYUP:    case WM_SYSKEYUP: 
         PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT) lParam;
         fEatKeystroke = 
            ( (p->vkCode == VK_TAB) && ((p->flags & LLKHF_ALTDOWN) != 0) ) ||
            ( (p->vkCode == VK_ESCAPE) && ((p->flags & LLKHF_ALTDOWN) != 0) ) ||
            ( (p->vkCode == VK_ESCAPE) && ((GetKeyState(VK_CONTROL) & 0x8000) != 0) )||
            ( (p->vkCode == 46) && ( (p->flags & LLKHF_ALTDOWN) != 0 ) && 
( (GetKeyState(VK_CONTROL) & 0x8000) != 0));   
    //its possible to add other keys....
    //the 46 means del
     break;
      }
   }
   return(fEatKeystroke ? 1 : CallNextHookEx(NULL, nCode, wParam, lParam));
}


///////////////////////////////////////////////////////////////////////////////


int WINAPI WinMain(HINSTANCE hinstExe, HINSTANCE, PTSTR pszCmdLine, int) {

   // Install the low-level keyboard & mouse hooks
   HHOOK hhkLowLevelKybd  = SetWindowsHookEx(WH_KEYBOARD_LL, 
      LowLevelKeyboardProc, hinstExe, 0);

   // Keep this app running until we're told to stop
   MessageBox(NULL, 
      TEXT("Alt+Esc, Ctrl+Esc, and Alt+Tab are now not working.\n"),
      TEXT("Disable Low-Level Keys"), MB_OK);
   UnhookWindowsHookEx(hhkLowLevelKybd);

   return(0);
}


///////////////////////////////// End Of File /////////////////////////////////
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