Powershell running under a service hangs on *.zip CopyHere - powershell

Question

I'm running a Windows Service (Hudson) which in turn spawns a PowerShell process to run my custom PowerShell commands. Part of my script is to unzip a file using CopyHere. When I run this script locally, I see a progress dialog pop up as the files are extracted and copied. However, when this runs under the service, it hangs at the point where a dialog would otherwise appear.
Here's the unzip portion of my script.
# Extract the contents of a zip file to a folder
function Extract-Zip {
param([string]$zipFilePath, [string]$destination)
if(test-path($zipFilePath)) {
$shellApplication = new-object -com shell.application
$zipFile = get-item $zipFilePath
$zipFolder = $shellApplication.NameSpace($zipFile.fullname)
$destinationFile = get-item $destination
$destinationFolder = $shellApplication.NameSpace($destinationFile.fullname)
$destinationFolder.CopyHere($zipFolder.Items())
}
}
I suspect that because its running under a service process which is headless (no interaction with the desktop), its somehow stuck trying to display a dialog.
Is there a way around this?

Answer 1

If it's still actual, I managed to fix this with having CopyHere params equal 1564.
So in my case extract zip function looks like:
function Expand-ZIPFile{
param(
$file, $destination
)
$shell = new-object -com shell.application
$zip = $shell.NameSpace($file)
foreach($item in $zip.items())
{
$shell.Namespace($destination).copyhere($item,1564)
"$($item.path) extracted"
}
1564 description can be found here - http://msdn.microsoft.com/en-us/library/windows/desktop/bb787866(v=vs.85).aspx:
(4) Do not display a progress dialog box.
(8) Give the file being operated on a new name in a move, copy, or rename operation if a file with the target name already exists.
(16) Respond with "Yes to All" for any dialog box that is displayed.
(512) Do not confirm the creation of a new directory if the operation requires one to be created.
(1024) Do not display a user interface if an error occurs.

Answer 2

If this is running on Vista or Windows 7, popping up UI from a service isn't going to be seen by the end user as you suspected. See this paper on Session 0 Isolation. However, does the progress dialog require user input? If not, I wouldn't think that would cause the service to hang. I would look for an option to disable the progress display. If you can't find that, then try switching to another ZIP extractor. PSCX 1.2 comes with an Expand-Archive cmdlet. I'm sure there are also others available.

Answer 3

Looking at the documentation for PowerShell, it looks like the -NonInteractive option may help here