FileSystemWatcher not firing events till PowerShell closes - powershell

Question

I have a script (below) that watches a folder that the .ps1 script sits in.
When a file is created it fires a .bat file to do a job.
Initially it would run and close immediately.
So I added '''Start-Sleep -s 50'''
It works but it only triggers the .bat launch when the PowerShell window closes.
(As I don't know how long it will be till a file turns up in the folder, this is kind of useless).
Ideally I could do with the .bat file launching as soon as the new file is created, which in turn then closes the PowerShell window
$configFilePath = $PSScriptRoot
$filter = '*.*'
$fsw = New-Object IO.FileSystemWatcher $configFilePath, $filter -Property #{IncludeSubdirectories = $true;NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite'}
Register-ObjectEvent $fsw Created -SourceIdentifier FileCreated -Action {
$name = $Event.SourceEventArgs.Name
$changeType = $Event.SourceEventArgs.ChangeType
$timeStamp = $Event.TimeGenerated
Write-Host "The file '$name' was $changeType at $timeStamp" -fore green
Out-File -FilePath c:\temp\log\Filelog.txt -Append -InputObject "The file '$name' was $changeType at $timeStamp"
Set-Location "$PSScriptRoot"
Start-Process "$PSScriptRoot\PS_Run.bat"
}
Start-Sleep -s 50

Answer 1

You can replace Start-Sleep with:
Wait-Event -SourceIdentifier FileCreated
Then you need to add an exit command to your watcher like this:
Start-Process "$PSScriptRoot\PS_Run.bat"
exit
}
Since you cannot exit the console from the filewatcher, you can do this instead:
$configFilePath = $PSScriptRoot
$filter = '*.*'
$fsw = New-Object IO.FileSystemWatcher $configFilePath, $filter -Property #{IncludeSubdirectories = $true;NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite'}
Register-ObjectEvent $fsw Created -SourceIdentifier FileCreated -Action {
$name = $Event.SourceEventArgs.Name
$changeType = $Event.SourceEventArgs.ChangeType
$timeStamp = $Event.TimeGenerated
Write-Host "The file '$name' was $changeType at $timeStamp" -fore green
Out-File -FilePath c:\temp\log\Filelog.txt -Append -InputObject "The file '$name' was $changeType at $timeStamp"
Set-Location "$PSScriptRoot"
Start-Process "$PSScriptRoot\PS_Run.bat"
}
Wait-Event -SourceIdentifier FileCreated -Timeout 50 # or no of seconds before file shows up.
When run as a scheduled task, this will execute the bat file as soon as a new file is created and close the console when the timeout is reached.