Repeat code if process is running

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Hello, How can I repeat again and again code if process still running?

I want to check if program still running, if yes, check again and again, if no continue in execute next part of code.

Function CheckIfRunning() As Boolean
        p = Process.GetProcessesByName("Ls32") 
        
        If p.Count > 0 Then
            ' Process is running
            CheckIfRunning = True

        Else
            ' Process is not running
            CheckIfRunning = False
        End If
    End Function

'calling function

CheckIfRunning()
                               If CheckIfRunning() = True Then
                                   CheckIfRunning()
                                   Threading.Thread.Sleep(800)
                               Else
                                   ButtonIncrement_Click(Nothing, Nothing)
                               End If

What I have tried:

while CheckIfRunning()=true
Loop

Posted 4-Dec-19 5:33am

Member 13711215

Updated 4-Dec-19 6:20am

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2 solutions

Solution 2

Aside from solution 1 which is quite relevant, I would advise you not to compare a boolean to a boolean.
Instead of

VB

If CheckIfRunning() = True Then

write

VB

If CheckIfRunning() Then

And for the contrary, instead of

VB

If CheckIfRunning() = False Then

write

VB

If Not CheckIfRunning() Then

The reason for that is that comparing a boolean to a boolean is redundant and thus unnecessary.

Posted 4-Dec-19 6:20am

phil.o

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OriginalGriff · Accepted Answer · 2019-12-04T05:46:00

The problem is that if you loop on your function, your UI thread is blocked until the process is completed - and if it's blocked, it can;t respond to user input and will "lock up" as far as the user is concerned.

I'd suggest that you look at a BackgroundWorker thread to process your loop, and to report "Process complete" back to your UI thread.
BackgroundWorker Class (System.ComponentModel) | Microsoft Docs[^] - it includes an example.