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POHow to call a powershell function within the script from Start-Job?
 

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  1. POHow to call a powershell function within the script from Start-Job?
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    <p>I saw <a href="https://stackoverflow.com/questions/7162090/how-do-i-start-a-job-of-a-function-i-just-defined">this question</a> and <a href="https://stackoverflow.com/questions/12293701/function-not-recognized-in-start-job">this question</a> but couldn't find solution to my problem.</p> <p>So here is the situation: I have two functions DoWork and DisplayMessage in a script (.ps1) file. Here is the code: </p> <pre><code>### START OF SCRIPT ### function DoWork { $event = Register-EngineEvent -SourceIdentifier NewMessage -Action { DisplayMessage($event.MessageData) } $scriptBlock = { Register-EngineEvent -SourceIdentifier NewMessage -Forward $message = "Starting work" $null = New-Event -SourceIdentifier NewMessage -MessageData $message ### DO SOME WORK HERE ### $message = "Ending work" $null = New-Event -SourceIdentifier NewMessage -MessageData $message Unregister-Event -SourceIdentifier NewMessage } DisplayMessage("Processing Starts") $array = @(1,2,3) foreach ($a in $array) { Start-Job -Name "DoActualWork" $ScriptBlock -ArgumentList $array | Out-Null } #$jobs = Get-Job -Name "DoActualWork" While (Get-Job -Name "DoActualWork" | where { $_.State -eq "Running" } ) { Start-Sleep 1 } DisplayMessage("Processing Ends") Get-Job -Name "DoActualWork" | Receive-Job } function DisplayMessage([string]$message) { Write-Host $message -ForegroundColor Red } DoWork ### END OF SCRIPT ### </code></pre> <p>I am creating 3 background jobs (using $array with 3 elements) and using event to pass messages from background jobs to the host. I would expect the powershell host to display "Processing Starts" and "Processing Ends" 1 time and "Starting work" and "Ending work" 3 times each. But instead I am not getting "Starting work"/"Ending work" displayed in console.</p> <p>Event is also treated as a job in powershell, so when I do Get-Job, I can see following error associated with the event job:</p> <blockquote> <p>{The term 'DisplayMessage' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.}</p> </blockquote> <p>My question: How can we reuse (or reference) a function (DisplayMessage in my case) defined in the same script from where I am calling Start-Job? Is it possible? I know we can use -InitializationScript to pass functions/modules to Start-Job, but I do not want to write DisplayMessage function twice, one in script and another in InitializationScript.</p>
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