Disable CONTROL + ALT + DELETE and Windows (win) Key in Windows 7 using the Win32 application

Question

I am writing an application that works as kioskit should and should allow the user to exit the application. As Windows 7when he presses a key Win, or CTRL+ ALT+ DELETE, it comes out of the program. I need to disable the key combination CTRL+ ALT+ DELETEand Winsoftware Windows 7.

Answer 1

Pressing Alt+ will Tabalso disable the application. Ctrl+ Esc- an alternative shortcut to open the Start menu. Alt+ EscSwitch between running applications. There are a number of different key sequences that can do this; a natural consequence of the fact that Windows is a multi-tasking operating system.

, , . , . , , , . (Paul DiLascia) , , MSDN. , , , :

TaskKeyHook.h:

////////////////////////////////////////////////////////////////
// MSDN Magazine — September 2002
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual Studio 6.0 and Visual Studio .NET on Windows XP.
//
#define DLLIMPORT __declspec(dllimport)

DLLIMPORT BOOL DisableTaskKeys(BOOL bEnable, BOOL bBeep);
DLLIMPORT BOOL AreTaskKeysDisabled();

TaskKeyHook.cpp

////////////////////////////////////////////////////////////////
// MSDN Magazine — September 2002
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual Studio 6.0 and Visual Studio .NET on Windows XP.
//
// This file implements the low-level keyboard hook that traps the task 
// keys.
//
#define _WIN32_WINNT 0x0500 // for KBDLLHOOKSTRUCT
#include <afxwin.h>         // MFC core and standard components

#define DLLEXPORT __declspec(dllexport)

//////////////////
// App (DLL) object
//
class CTaskKeyHookDll : public CWinApp {
public:
   CTaskKeyHookDll()  { }
   ~CTaskKeyHookDll() { }
} MyDll;

////////////////
// The section is SHARED among all instances of this DLL.
// A low-level keyboard hook is always a system-wide hook.
// 
#pragma data_seg (".mydata")
HHOOK g_hHookKbdLL = NULL; // hook handle
BOOL  g_bBeep = FALSE;     // beep on illegal key
#pragma data_seg ()
#pragma comment(linker, "/SECTION:.mydata,RWS") // tell linker: make it 
                                                // shared

/////////////////
// Low-level keyboard hook:
// Trap task-switching keys by returning without passing along.
//
LRESULT CALLBACK MyTaskKeyHookLL(int nCode, WPARAM wp, LPARAM lp)
{
   KBDLLHOOKSTRUCT *pkh = (KBDLLHOOKSTRUCT *) lp;

   if (nCode==HC_ACTION) {
      BOOL bCtrlKeyDown =
         GetAsyncKeyState(VK_CONTROL)>>((sizeof(SHORT) * 8) - 1);

      if ((pkh->vkCode==VK_ESCAPE && bCtrlKeyDown) || // Ctrl+Esc
          // Alt+TAB
          (pkh->vkCode==VK_TAB && pkh->flags & LLKHF_ALTDOWN) ||   
          // Alt+Esc
          (pkh->vkCode==VK_ESCAPE && pkh->flags & LLKHF_ALTDOWN)|| 
          (pkh->vkCode==VK_LWIN || pkh->vkCode==VK_RWIN)) { // Start Menu
         if (g_bBeep && (wp==WM_SYSKEYDOWN||wp==WM_KEYDOWN))
            MessageBeep(0); // only beep on downstroke if requested
         return 1; // gobble it: go directly to jail, do not pass go
      }
   }
   return CallNextHookEx(g_hHookKbdLL, nCode, wp, lp);
}

//////////////////
// Are task keys disabled—ie, is hook installed?
// Note: This assumes there no other hook that does the same thing!
//
DLLEXPORT BOOL AreTaskKeysDisabled()
{
   return g_hHookKbdLL != NULL;
}

//////////////////
// Disable task keys: install low-level kbd hook.
// Return whether currently disabled or not.
//
DLLEXPORT BOOL DisableTaskKeys(BOOL bDisable, BOOL bBeep)
{
   if (bDisable) {
      if (!g_hHookKbdLL) {
         g_hHookKbdLL = SetWindowsHookEx(WH_KEYBOARD_LL,
            MyTaskKeyHookLL, MyDll.m_hInstance, 0);
      }

   } else if (g_hHookKbdLL != NULL) {
      UnhookWindowsHookEx(g_hHookKbdLL);
      g_hHookKbdLL = NULL;
   }
   g_bBeep = bBeep;

   return AreTaskKeysDisabled();
}

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Ctrl + Alt + Del ( SAS), . , , SAS, , , . . , , , , , Windows XP. , , - , , .. - .

Answer 2

AFAIK, CTRL + ALT + DELETE win32. , , .

Answer 3

I think this would be possible by replacing the main Windows keyboard driver, kbdclass.sys. It should be possible inside it to handle the pressing of the "Delete" key and, for example, not to transfer it further when the Ctrl and Alt keys are already omitted.