Visual Basic Code of the Week (COTW)
http://www.codeoftheweek.com
Issue #45
Online Version at http://www.codeoftheweek.com/membersonly/bi/0045.html (paid subscribers only)
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Requirements for this Issue

The source code in this issue is designed for Visual Basic 4.0 32-bit and above. It is for any level programmer.

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In this Issue

This issue introduces routines to enable and disable the ctrl-alt-del key combination. This can be useful in utilities where interrupting it can cause major problems (such as disk editors) or maybe you are just writing a simple screen saver. It can also be useful in an environment where security is a major concern and you do not want the general user to be able to terminate tasks at their discretion.

EnableCtrlAltDel and DisableCtrlAltDel

These routines accomplish the task of enabling/disabling the Ctrl-Alt-Del keystrokes by making Windows think that your application is a screen saver.

Public Sub DisableCtrlAltDel()
Public Sub EnableCtrlAltDel()

Parameters

Returns

If any errors occur they will be raised to the caller with an error number of 5000. The error description will contain the error code returned by the SystemParametersInfo function.

Sample Usage

This example shows how to use the subroutines.

    On Error Resume Next

    DisableCtrlAltDel
    If Err <> 0 Then
        MsgBox "An error occurred disabling the Ctrl-Alt-Del keys: " & Err.Description
    End If

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Summary

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