(PowerShell) Append Files to Existing Zip w/out Rewriting Entire Zip

Demonstrates how to use the QuickAppend method to append files to an existing .zip archive. This method works by editing the existing .zip -- it does not rewrite or recompress the contents of the existing .zip. It is the fastest way to append additional files to a pre-existing large .zip archive. Note: The QuickAppend method is new and available in the pre-release downloads, or in official releases dated after 6-October-2007.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$zip = New-Object Chilkat.Zip

# The NewZip method only initializes the Zip object -- it does
# not create or write a .zip file.
$success = $zip.NewZip("notUsed.zip")
if ($success -ne $true) {
    $($zip.LastErrorText)
    exit
}

# Add a reference to a file.  This is the file that will
# be added to a pre-existing .zip archive.  
# Note: this does not read or compress the file contents --
# it simply adds a reference to the zip object.
$saveExtraPath = $false
$success = $zip.AppendOneFileOrDir("something.dat",$saveExtraPath)
if ($success -ne $true) {
    $($zip.LastErrorText)
    exit
}

# Appends the contents of the zip object to the preExisting.zip
# zip archive.  preExisting.zip is opened, and the files
# referenced by this zip object are streamed in, compressed,
# and appended to the end of the archive.
$success = $zip.QuickAppend("preExisting.zip")
if ($success -ne $true) {
    $($zip.LastErrorText)
    exit
}

$("Success!")

# Note: Additional files, directory trees, or in-memory data
# can be appended by calling AppendOneFileOrDir, AppendFiles,
# AppendString, AppendData, etc. multiple times.
# Whatever files and/or in-memory data that are referenced by
# this zip object will be appended to preExisting.zip when
# QuickAppend is called