Powershell 2.0 extract certain files from zip (include subdirectories) - powershell

Question

Apologies, this question is scattered on the internet but I have yet to find a satisfactory answer that uses only Powershell 2.0 (with .NET v3.5) - no external libraries or programs
I'm using the following code to extract log.txt from ZipFile.zip (no matter log.txt's location)
$Destination = (new-object -com shell.application).NameSpace('C:\ZipExtractDir')
$ZipFile = (new-object -com shell.application).NameSpace('C:\ZipFile.zip')
$Destination.CopyHere(($Zipfile.Items() | where-object {$_.Name -like '*log.txt'}), 1044)
Works if log.txt is in directory root \log.txt
Fails if log.txt is in a subdirectory \Subfolder\log.txt
Fails if referencing the literal (.zip) path
{$_.Name -Like '*Subfolder\log.txt'} (both double & single quotes fail)
Have tried using -eq -like -contains '' "" $_.FullName
I'm quite certain that I'm filtering incorrectly - can anyone help with this code so that it will parse subdirectories as well?

Answer 1

Similar to what you have already done, you can set up the Shell.Application namespaces like this. Then you can copy the extracted directory to the destination path.
$zipFilePath = "Zipfile.zip"
$destinationPath = "C:\Users\Public\Downloads"
$zipfile = (New-Object -Com Shell.Application).NameSpace($zipFilePath)
$destination = (New-Object -Com Shell.Application).NameSpace($destinationPath)
$destination.CopyHere($zipfile.Items())
Then to list the log.txt files, we can contruct the full extracted path with Join-Path. This basically just appends the zip file name from System.IO.Path.GetFileNameWithoutExtension() to the destination path. Then just use Get-ChildItem to list the files recursively with the -Recurse and -Filter switches.
$extractedPath = Join-Path -Path $destinationPath -ChildPath ([System.IO.Path]::GetFileNameWithoutExtension($zipFilePath))
Get-ChildItem -Path $extractedPath -Filter log.txt -Recurse
And to test this for PowerShell 2.0 we can use -version 2 with powershell.exe:
powershell.exe -version 2 .\test.ps1
UPDATE
If you want to inspect files before extracting, you'll need to recurse the directories yourself. Below is a demo of how this can be done.
function New-ZipChildRootFolder
{
param
(
[string]$DestinationPath,
[string]$ZipFileName
)
$folderPath = Split-Path -Path $ZipFileName -Leaf
$destination = (New-Object -ComObject Shell.Application).NameSpace($DestinationPath)
$destination.NewFolder($folderPath)
}
function Get-ZipChildItems
{
param
(
[string]$ZipFilePath,
[string]$DestinationPath
)
$zipfile = (New-Object -ComObject Shell.Application).NameSpace($ZipFilePath)
$zipFileName = [System.IO.Path]::GetFileNameWithoutExtension($ZipFilePath)
Write-Output "Create root zip folder : $zipFileName"
New-ZipChildRootFolder -DestinationPath $DestinationPath -ZipFileName $zipFileName
foreach ($item in $zipFile.items())
{
Get-ZipChildItemsRecurse -Items $item -DestinationPath $DestinationPath -ZipFileName $zipFileName
}
}
function Get-ZipChildItemsRecurse
{
param
(
[object]$Items,
[string]$DestinationPath,
[string]$ZipFileName
)
foreach ($file in $Items.getFolder.Items())
{
if ($file.IsFolder -eq $true)
{
Write-Output "Creating folder : $($file.Path)"
New-ZipChildFolder -Folder $file -DestinationPath $DestinationPath -ZipFileName $ZipFileName
Get-ZipChildItemsRecurse -Items $file -DestinationPath $DestinationPath -ZipFileName $ZipFileName
}
else
{
$filename = Split-Path -Path $file.Path -Leaf
if ($filename -eq "log.txt")
{
Write-Output "Copying file : $($file.Path)"
New-ZipChildFile -File $file -DestinationPath $DestinationPath -ZipFileName $ZipFileName
}
}
}
}
function New-ZipChildFile
{
param
(
[object]$File,
[string]$DestinationPath,
[string]$ZipFileName
)
$destination = New-Object -ComObject Shell.Application
$items = $File.Path.Split("\")
$zipRootIndex = [array]::IndexOf($items, $ZipFileName)
$path = $items[$zipRootIndex..($items.Length - 2)] -join "\"
$fullPath = Join-path -Path $DestinationPath -ChildPath $path
$destination.NameSpace($fullPath).CopyHere($File)
}
function New-ZipChildFolder
{
param
(
[object]$Folder,
[string]$DestinationPath,
[string]$ZipFileName
)
$destination = New-Object -ComObject Shell.Application
$items = $Folder.Path.Split("\")
$zipRootIndex = [array]::IndexOf($items, $ZipFileName)
$folders = $items[$zipRootIndex..($items.Length - 1)]
$currentFolder = $DestinationPath
foreach ($folder in $folders)
{
$destination.NameSpace($currentFolder).NewFolder($folder)
$currentFolder = Join-Path -Path $currentFolder -ChildPath $folder
}
}
Usage:
$zipFilePath = "C:\Zipfile.zip"
$destinationPath = "C:\Users\Public\Downloads"
Get-ZipChildItems -ZipFile $zipFilePath -DestinationPath $destinationPath