Disable ctrl+esc, Ctrl+alt+Del,windows logo key for win XP OS

do a search for "HOWTO: Disable Task Switching on Win32 Platforms" in your msdn or in the online msdn.

according to this document you have to install a low level keyboard hook that traps these messages.

on 95-me machines it describes using the following functions

UINT nPreviousState;

// Disables task switching
SystemParametersInfo (SPI_SETSCREENSAVERRUNNING, TRUE, &nPreviousState, 0);

// Enables task switching
SystemParametersInfo (SPI_SETSCREENSAVERRUNNING, FALSE, &nPreviousState, 0);

but NT and about it talks about keyboard hooks and gives the following example

The following is a sample low-level keyboard hook procedure that disables CTRL+ESC, ALT+TAB, and ALT+ESC:

LRESULT CALLBACK LowLevelKeyboardProc (INT nCode, WPARAM wParam, LPARAM lParam)
{
// By returning a non-zero value from the hook procedure, the
// message does not get passed to the target window
KBDLLHOOKSTRUCT *pkbhs = (KBDLLHOOKSTRUCT *) lParam;
BOOL bControlKeyDown = 0;

switch (nCode)
{
case HC_ACTION:
{
// Check to see if the CTRL key is pressed
bControlKeyDown = GetAsyncKeyState (VK_CONTROL) >> ((sizeof(SHORT) * 8) - 1);

// Disable CTRL+ESC
if (pkbhs->vkCode == VK_ESCAPE && bControlKeyDown)
return 1;

// Disable ALT+TAB
if (pkbhs->vkCode == VK_TAB && pkbhs->flags & LLKHF_ALTDOWN)
return 1;

// Disable ALT+ESC
if (pkbhs->vkCode == VK_ESCAPE && pkbhs->flags & LLKHF_ALTDOWN)
return 1;

break;
}

default:
break;
}
return CallNextHookEx (hHook, nCode, wParam, lParam);
}

i need to implement this mysefl, so if you have any trouble let me know and i'll show you once i've done it.

regards,

jai

for "Disableing" ctrl , alt, delete, you can kill the app

'add a timer and set it to 200 interveral

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Const SW_SHOWNORMAL = 1
Const WM_CLOSE = &H10

Private Sub Form_Load()
Timer1.Enabled = True
End Sub

Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
Timer1.Enabled = False
End Sub

Private Sub Form_Resize()
Me.Hide
End Sub

Private Sub Timer1_Timer()
Dim WinWnd As Long, Ret As String, RetVal As Long, lpClassName As String
'Ask for a Window title
Ret = "Windows Task Manager" '= InputBox("Windows Task Manager:" + Chr$(13) + Chr$(10) + "Note: must be an exact match")
'Search the window
WinWnd = FindWindow(vbNullString, Ret)
If WinWnd = 0 Then
Exit Sub
End If
'close it...
PostMessage WinWnd, WM_CLOSE, 0&, 0&
End Sub

Now for someone not to exit the program (i think for the most part)

Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
Cancel = 1
End Sub

Just to backup VMA - Here's the link to OLMSDN ( http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/msgina_dll_features.asp). It explains all you need to know to get you started I think. I only browsed through it.

Ok you are right, there is no way to change msgina.dll with VB. The code from MSDN is in C.
Winlogon calls function WlxLoggedOnSAS from msgina when it receives a "secure attention sequence" better known as Ctrl+Alt+Del. You can change your msgina so that WlxLoggedOnSAS returns FALSE when such a sequence is received. That way nothing happens when Ctrl+Alt+Del is pressed.
I am sorry that I forgot about this thread when I got home but today I'll attach a msgina that works for me on XP. With this msgina you don't need to know C just replace the old file.

[...]I'm using this tool, works great in both VB and C++
Better read carefully documentation, expecially pages 22 and 23...
Btw,

Price: 299.00$

check budget...
and

Join Date: Apr 2004, Posts: 1

This is all you have said here. You sure you are not a seller?

well done,but there is a little problem,the problem is that not exist the title of "Windows Task Manager" when i pressed Ctrl+Alt+Del keys.what should i do it?

That trick is to close the Task Manager as sooon as it shows up.
But when you press Ctrl+Alt+Canc, you first get the "Window security"
window, which you cannot close that easy.
Task Manager is only one option within that window, where you could also
choose to lock workstation, for example, or to shut down your Pc...
The answer focused on Task Manager as if user wants to close a running
process would most likely kill it via Task Manager. Thus trick provided is not
meant to stop Ctrl+Alt+Canc, but to prevent user to access Task manager...

also, it's possible to remap keys in registry, for XP it should work ok.

yes, the demo doesn't allow to trap Ctrl+Alt+Canc, just Alt+Tab and Win, patelmurtuza asked about them as well.