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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Mar 4, 2000

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Hide the application in the Task List dialog

As you know, when you press CTRL+ALT+CANC the Task List window appears. This dialog allows you to see all the running processes and also to terminate them. If you don't want that your application be closed, you can prevent the application from being displayed in the Task List dialog, by using the RegisterServiceProcess API function. You won't find its declaration in the API Loader, so here it is:

Private Declare Function RegisterServiceProcess Lib "kernel32.dll" (ByVal _
    dwProcessId As Long, ByVal dwType As Long) As Long
This function takes two parameters: the first is the identifier of the process to hide (or show), the second specifies if you want to hide (1) or show (0) the process. The identifier of the current process can be obtainted using GetCurrentProcessId API function. Here's a function that lets you hide or show your application, depending on the value you pass to its Boolean argument:

Private Declare Function GetCurrentProcessId Lib "kernel32.dll" () As Long

Sub ShowInTaskList(ByVal bShowInTaskList As Boolean)
    RegisterServiceProcess GetCurrentProcessId, IIf(bShowInTaskList, 0, 1)
End Sub

Marco Bellinaso
 
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