Powershell Timeout After two Seconds - powershell

Question

I'm new to powershell. I read some lines on www.powershell.com. Now I need your help to solve a problem. I want to read the UUID from clients in the Network. Therefore I created a document "pcs.txt" where all PCs are stored.
$pc = Get-Content pcs.txt #Read content of file
$cred = Get-Credential “domain\user”
for ($i=0; $i -lt $pc.length; $i++) {
$Result=test-connection -ComputerName $pc[$i] -Count 1 -Quiet
If ($Result -eq 'True')
{
$uuid = (Get-WmiObject Win32_ComputerSystemProduct -ComputerName $pc[$i] -Credential $cred).UUID
$Ausgabe=$pc[$i] + ';'+$uuid
$Ausgabe
}
else
{
$Ausgabe=$pc[$i] + '; UUID nicht erhalten'
$Ausgabe
}
}
First I test if the ping works. When the ping works I try to get the uuid.
Sometimes I don't get the uuid even if the ping worked. So I would like to code a timeout, which say -> go to next pc when you don't have the uuid after 2 seconds.
Can you help me please?

Answer 1

Alas, there is no timeout parameter for Get-WmiObject commandlet. There is a feature request in MS Connect, but it is from 2011 and still open.
A workaround, which I haven't tested is available by using System.Management. I'll copy-and-paste it here in case the link goes dead. (And I hate SO answers that only contain links to resouces that may or may not exist...)
Function Get-WmiCustom([string]$computername,[string]$namespace,[string]$class,[int]$timeout=15){
$ConnectionOptions = new-object System.Management.ConnectionOptions
$EnumerationOptions = new-object System.Management.EnumerationOptions
$timeoutseconds = new-timespan -seconds $timeout
$EnumerationOptions.set_timeout($timeoutseconds)
$assembledpath = "\\" + $computername + "\" + $namespace
#write-host $assembledpath -foregroundcolor yellow
$Scope = new-object System.Management.ManagementScope $assembledpath, $ConnectionOptions
$Scope.Connect()
$querystring = "SELECT * FROM " + $class
#write-host $querystring
$query = new-object System.Management.ObjectQuery $querystring
$searcher = new-object System.Management.ManagementObjectSearcher
$searcher.set_options($EnumerationOptions)
$searcher.Query = $querystring
$searcher.Scope = $Scope
trap { $_ } $result = $searcher.get()
return $result
}

Answer 2

I found a good workaround!
http://theolddogscriptingblog.wordpress.com/2012/05/11/wmi-hangs-and-how-to-avoid-them/
Here my working code:
$pc = Get-Content pcs.txt #FILE FROM THE HARDDISK
$cred = Get-Credential “DOMAIN\USER” #
for ($i=0; $i -lt $pc.length; $i++)
{
$Result=test-connection -ComputerName $pc[$i] -Count 1 -Quiet
If ($Result -eq 'True')
{
$WMIJob = Get-WmiObject Win32_ComputerSystemProduct -ComputerName $pc[$i] -Credential $cred -AsJob
$Timeout=Wait-Job -ID $WMIJob.ID -Timeout 1 # the Job times out after 1 seconds.
$uuid = Receive-Job $WMIJob.ID
if ($uuid -ne $null)
{
$Wert =$uuid.UUID
$Ausgabe=$pc[$i] + ';'+$Wert
$Ausgabe
}
else
{
<#$b = $error | select Exception
$E = $b -split (:)
$x = $E[1]
$Error.Clear() #>
$Ausgabe=$pc[$i] + '; got no uuid'
$Ausgabe
}
}
else
{
$Ausgabe='PC not reached through ping.'
$Ausgabe
}
}
I hope I can help somebody with that