Create ZIP archives

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posted by Tobias Weltner

12-01-2008

9 comments

Downloads: 855

File size: 1.4kB

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Create ZIP archives

function Create-myZIP { 
    param($path, [switch]$includeSubdir, $root = '') 
 
 
    begin { 
        Write-Progress "Creating ZIP" "initializing $path" 
        [System.Reflection.Assembly]::LoadFile("$home\ICSharpCode.SharpZipLib.dll") | Out-Null 
        $item = New-Item $path -type File -force 
        $archive = New-Object ICSharpCode.SharpZipLib.Zip.ZipOutputStream(($item.OpenWrite())) 
        if ($root.length -gt 1  )  {$root = Split-Path -noQualifier $root } 
    } 
 
    process { 
        if ($_.psIsContainer -ne $true) { 
            Write-Progress "Adding File to ZIP '$path':" "$($_.FullName)" 
            if ($includeSubDir) { 
                $name = Split-Path -noQualifier $_.fullname 
                if ($name.startswith($root)) {  
                    $name = $name.subString($root.length) 
                }  
                $name = $name.subString(1) 
            } else {  
                $name = $_.Name 
            } 
 
            $file = New-Object icsharpcode.SharpZipLib.Zip.ZipEntry $name 
            $archive.PutNextEntry($file) 
            [byte[]]$content = Get-Content $_.FullName -encoding Byte -readCount 4GB 
            if ($content.Length -gt 0) { 
                $archive.write($content, 0, $content.length) 
            } 
        } 
    } 
 
    end { 
        Write-Progress "Creating ZIP" "Done." 
        $archive.close() 
    } 
} 
 
# create flat archive with only scripts from top level folder: 
dir $home\*.ps1 | Create-myZIP "$home\aFlat.zip"  
 
# create hierarchical zip with subfolders, setting relative root to $home: 
dir $home\Documents *.ps1 -recurse | Create-myZIP "$home\aAll.zip" -includeSubDir -root $home\Documents 

Filed under: ZIP, Read-Content, ZipLib, ICSharp

Uses an external free ZIP library to create flat and hiearchical ZIP files right from the PowerShell pipeline. Get the free ZIP component here: http://www.icsharpcode.net/OpenSource/SharpZipLib/

Comments

Sylvain LESIRE wrote re: Create ZIP archives

on 12-12-2008 6:50 AM

Hi Tobias,

I was found a script which permits to create Zip at :

blogs.inetium.com/.../295.aspx

dscott98 wrote re: Create ZIP archives

on 04-23-2009 6:48 PM

Great example on how to create an archive, any chance of an example on extracting files? I've been trying for a couple days with both the SharpZip library, and DotNetZip, and am unable to extract files.

Richard Giles wrote re: Create ZIP archives

on 04-23-2009 10:11 PM

One way is to use the Shell.Application com object:

$sh = new-object -com shell.application

# Where the .zip is

$zipfolder = $sh.namespace("C:\foo\foo.zip")

# The item in the zip

$item = $zipfolder.parsename("foo.txt")

# Where the item is to go

$targetfolder = $sh.namespace("C:\foo")

# Copy zipped file item to target folder

$targetfolder.copyhere($item)

dscott98 wrote re: Create ZIP archives

on 04-24-2009 12:36 PM

That works on smaller files, but i run into basically timeout errors when compressing large files. The ones I am working with are 500mb+ and I'm adding multiples to a single zip archive.

Richard Giles wrote re: Create ZIP archives

on 04-25-2009 1:18 PM

How about this using ICSharpCpde:

$sourceFile = get-item "C:\foo\foo.zip"

$destDir = get-item "C:\foo"

[System.Reflection.Assembly]::LoadFile("C:\foo\ICSharpCode.SharpZipLib.dll")

$unzip = new-object ICSharpCode.SharpZipLib.Zip.FastZip

$unzip.ExtractZip($sourceFile, $destDir,"")

If this does not work, the issue may not be the method you are using but instead be environmental. Such as doing this across a network connection. You alluded to timeouts which is why I am guess it may be network related.