Powershell: How do I get the exit code returned from a process run inside a PsJob?

Question

I have the following job in powershell:

$job = start-job {
  ...
  c:\utils\MyToolReturningSomeExitCode.cmd
} -ArgumentList $JobFile

How do I access the exit code returned by c:\utils\MyToolReturningSomeExitCode.cmd ? I have tried several options, but the only one I could find that works is this:

$job = start-job {
  ...
  c:\utils\MyToolReturningSomeExitCode.cmd
  $LASTEXITCODE
} -ArgumentList $JobFile

...

# collect the output
$exitCode = $job | Wait-Job | Receive-Job -ErrorAction SilentlyContinue
# output all, except the last line
$exitCode[0..($exitCode.Length - 2)]
# the last line is the exit code
exit $exitCode[-1]

I find this approach too wry to my delicate taste. Can anyone suggest a nicer solution?

Important, I have read in the documentation that powershell must be run as administrator in order for the job related remoting stuff to work. I cannot run it as administrator, hence -ErrorAction SilentlyContinue. So, I am looking for solutions not requiring admin privileges.

Thanks.

Answer 1

If all you need is to do something in background while the main script does something else then PowerShell class is enough (and it is normally faster). Besides it allows passing in a live object in order to return something in addition to output via parameters.

$code = @{}

$job = [PowerShell]::Create().AddScript({
  param($JobFile, $Result)
  cmd /c exit 42
  $Result.Value = $LASTEXITCODE
  'some output'
}).AddArgument($JobFile).AddArgument($code)

# start thee job
$async = $job.BeginInvoke()

# do some other work while $job is working
#.....

# end the job, get results
$job.EndInvoke($async)

# the exit code is $code.Value
"Code = $($code.Value)"

UPDATE

The original code was with [ref] object. It works in PS V3 CTP2 but does not work in V2. So I corrected it, we can use other objects instead, a hashtable, for example, in order to return some data via parameters.