A File Copy and Compress – PowerShell Script

Following on from my previous post. I’m creating a PowerShell script that takes an input of a file location via a dialog. Extracts some files through a copy action, and compresses them into an archive. As I will show in the 3rd post, the purpose is to extract out 2 files to help with deploying a SketchFlow project. Such a complex script is overkill for 2 files, but is easily extensible to handle a larger set of files.

Step 1 – User input of folder:
Create a function to launch a folder select dialog, this is achieved through a com object call.

function Select-Folder($message='Select a folder', $path = 0)
    $object = New-Object -comObject Shell.Application
    $folder = $object.BrowseForFolder(0, $message, 0, $path)
    if ($folder -ne $null)

Note: Could call this twice to prompt user for output location also.
To speed up script execution supply input parameter(s) to the script [input (and output) directory].

To achieve this simply use $args[0] (and $args[1]) instead of the Select-Folder cmdlet call.

The Select-Folder cmdlet launches:

Browse For Folder Dialog

Browse For Folder Dialog

Step 2 – Extract (via copy) the deployable files:
There are 3 tricks here; first extracting only files via not PSisContainer, grouping them via their extensions (in order to easily process them in a copy loop) and matching only a list of valid extensions (in this case xap and html).

$types = ".xap", ".html"

$files=  Get-ChildItem $folder | Where-Object {-not$_.PSisContainer} | Group-Object Extension 

$files = $files | Where-Object {$types-contains$_.Name}

New-Item -itemType Directory -path $deploymentFolder -ea SilentlyContinue

$files | ForEach-Object { $_.Group | Copy-Item -destination  $deploymentFolder }

Tip: use Some-Cmdlet | Format-Table or its variants to output details to screen to help with debugging.

Step 3 – Compress
This last step in the script is a compression action. I got the compression functions from David Aiken’s MSDN blog post. The Add-Zip function was unable to take a file path containing a directory-up (\..\), so the final script has Move-Item cmdlet line to compensate.

function Add-Zip

    if(-not (test-path($zipfilename)))
        set-content $zipfilename ("PK" + [char]5 + [char]6 + ("$([char]0)" * 18))
        (dir $zipfilename).IsReadOnly = $false    
    $shellApplication = new-object -com shell.application
    $zipPackage = $shellApplication.NameSpace($zipfilename)
    foreach($file in $input) 
            Start-sleep -milliseconds 500

The complete script file can be found here on Gist.GitHub.

The next step in this script could be to email the newly created zip file, but that’s something for a future post.


2 thoughts on “A File Copy and Compress – PowerShell Script

  1. […] A File Copy and Compress – PowerShell Script « [NickJosevski(Blog = ".NET")] Says: August 27, 2009 at 10:20 am | Reply […]

  2. […] use of the PowerShell script I created in my previous post it will extract the HTML and XAP file from the package folder and zip them […]

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