Output parameter from job when done - powershell

Question

UPDATE
I'm not struggeling with this error An event with the name 'StateChanged' does not exist - See the full code at TRYOUTS (the last code piece) below
original text
As mentioned before, I'm doing a code for automatically format and transfer files to multiple USB thumbdrives. And it´s done in parallel/async
Now the issue is that I want to output the drive letter of each USB as they completes / job is done. That letter is stored in a var/param inside the job function, but I don't know how to write it out when job is done.
I have an Register-ObjectEvent that fires when each USB is completed in formatting and transfering.
The script works really well and writes out the line USB slot = Job...
But I want to have my $driveLetter from inside $formatDrive written out in the line USB slot = $driveLetter.
Heres my code. Look for the lines $formatDrive and $jobEvent.
#Requires -version 2.0
ipmo storage
Register-WmiEvent -Class win32_VolumeChangeEvent -SourceIdentifier volumeChange
$formatDrive = {
Param($driveLetter)
Write-Host (Get-Date -Format s) "Erase disk..."
$source = "C:\Users\myname\Desktop\test"
Format-Volume -DriveLetter $driveLetter[0] -NewFileSystemLabel "test30" -FileSystem exFAT -Confirm:$false
robocopy $source $driveLetter /S
return $driveLetter
}
Write-Host (Get-Date -Format s) " Beginning script..."
do {
$newEvent = Wait-Event -SourceIdentifier volumeChange
$eventType = $newEvent.SourceEventArgs.NewEvent.EventType
$eventTypeName = switch ($eventType) {
1 {"Configuration changed"}
2 {"Device arrival"}
3 {"Device removal"}
4 {"docking"}
}
if ($eventType -eq 2) {
$driveLetter = $newEvent.SourceEventArgs.NewEvent.DriveName
$driveLabel = ([wmi]"Win32_LogicalDisk='$driveLetter'").VolumeName
Write-Host (Get-Date -Format s) "USB igang = " $driveLetter
# Execute process if drive matches specified condition(s)
$formatDrivejob = Start-Job -ScriptBlock $formatDrive -ArgumentList $driveLetter
$jobEvent = Register-ObjectEvent $formatDrivejob StateChanged -Action {
Write-Host (Get-Date -Format s) (' USB slot = Job #{0} ({1}) complete.' -f $sender.Id, $sender.Name)
[media.SystemSounds]::("Hand").Play()
$jobEvent | Unregister-Event
}
}
Remove-Event -SourceIdentifier volumeChange
} while (1-eq1) #Loop until next event
Unregister-Event -SourceIdentifier volumeChange
I've tried just writing it out inside the end of $formatDrive - which didn't work as it's running in background.
Also tried with return as you can see in $formatDrive
TRYOUTS:
#Requires -version 2.0
ipmo storage
Register-WmiEvent -Class win32_VolumeChangeEvent -SourceIdentifier volumeChange
$formatDrive = {
param($driveLetter)
write-host (get-date -format s) "Erase disk..."
$source = "C:\Users\jbh\Desktop\test"
Format-Volume -Driveletter $driveLetter[0] -NewFileSystemLabel "test30" -FileSystem exFAT -Confirm:$false
robocopy $source $driveLetter /S
return $driveLetter
}
write-host (get-date -format s) " Beginning script..."
do{
$newEvent = Wait-Event -SourceIdentifier volumeChange
$eventType = $newEvent.SourceEventArgs.NewEvent.EventType
$eventTypeName = switch($eventType)
{
1 {"Configuration changed"}
2 {"Device arrival"}
3 {"Device removal"}
4 {"docking"}
}
# initialize the array
$formatDrivejob = #()
if ($eventType -eq 2) {
$driveLetter = $newEvent.SourceEventArgs.NewEvent.DriveName
$driveLabel = ([wmi]"Win32_LogicalDisk='$driveLetter'").VolumeName
Write-Host (Get-Date -Format s) "USB igang = " $driveLetter
# Execute process if drive matches specified condition(s)
$formatDrivejob += Start-Job -ScriptBlock $formatDrive -ArgumentList $driveLetter
$jobEvent = Register-ObjectEvent $formatDrivejob StateChanged -Action {
Write-Host (Get-Date -Format s) (' USB slot = Job #{0} ({1}) complete.' -f $sender.Id, $sender.Name)
[media.SystemSounds]::("Hand").Play()
foreach ($i in $formatDrivejob){
if ($i.State -eq "Completed")
{
$letter = $formatDrivejob | receive-job | select -Last 1
Write-Host "Drive has finished:" $letter
$formatDrivejob.Remove($i)
}
}
$jobEvent | Unregister-Event
}
}
Remove-Event -SourceIdentifier volumeChange
} while (1-eq1) #Loop until next event
Unregister-Event -SourceIdentifier volumeChange

Answer 1

You can use Receive-job to get the results:
# initialize the array
[System.Collections.ArrayList]$formatDrivejob
if ($eventType -eq 2) {
$driveLetter = $newEvent.SourceEventArgs.NewEvent.DriveName
$driveLabel = ([wmi]"Win32_LogicalDisk='$driveLetter'").VolumeName
Write-Host (Get-Date -Format s) "USB igang = " $driveLetter
# Execute process if drive matches specified condition(s)
$formatDrivejob += Start-Job -ScriptBlock $formatDrive -ArgumentList $driveLetter
$jobEvent = Register-ObjectEvent $formatDrivejob StateChanged -Action {
Write-Host (Get-Date -Format s) (' USB slot = Job #{0} ({1}) complete.' -f $sender.Id, $sender.Name)
[media.SystemSounds]::("Hand").Play()
foreach ($i in $formatDrivejob){
if ($i.State -eq "Completed")
{
$letter = $formatDrivejob | receive-job | select -Last 1
Write-Host "Drive has finished:" $letter
$formatDrivejob.Remove($i)
}
}
$jobEvent | Unregister-Event
}
}

Answer 2

Maybe you can try an approach like this:
$DrivesToHandle = 5
$formatDrivejob = #()
Do {
if ($eventType -eq 2) {
$DrivesToHandle -= 1
$driveLetter = $newEvent.SourceEventArgs.NewEvent.DriveName
$driveLabel = ([wmi]"Win32_LogicalDisk='$driveLetter'").VolumeName
write-host (Get-Date -format s) "USB igang = $driveLetter"
# Execute process if drive matches specified condition(s)
$formatDrivejob += Start-Job -ScriptBlock $formatDrive -ArgumentList $driveLetter
}
} while ($DrivesToHandle -ne 0)
# Wait for all jobs to finish
$formatDrivejob | Wait-Job | Out-Null
# Retrieve the job results
$JobResults = $formatDrivejob | Receive-Job
foreach ($Job in $JobResults) {
Write-Host (get-date -format s) "Job result of job ID $($Job.Id): " $Job
}
# Remove all jobs
$formatDrivejob | Remove-Job -Force
When you work with jobs you can use Wait-Job to wait for the job to finish. But you also have to retrieve the job results, that's done by using the Receive-Job CmdLet.