PowerShell

Iterate Over ZIP Entries Using EntryAt

This example demonstrates how to use the EntryAt method to iterate over all entries contained within a ZIP archive.

The EntryAt method retrieves a ZipEntry object for a given zero-based index.

This is useful for:

• Enumerating all entries in a ZIP archive
• Inspecting filenames, sizes, and timestamps
• Searching or filtering ZIP contents

Suppose the ZIP archive contains:

docs/readme.txt
images/logo.png
data/config.json

The example loops through all ZIP entries and prints information about each entry.

PowerShell

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

$success = $false

$success = $false

# Open an existing ZIP archive.
$zip = New-Object Chilkat.Zip

$success = $zip.OpenZip("example.zip")
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

# Get the total number of entries in the ZIP archive.
$numEntries = $zip.NumEntries

$("Number of ZIP entries = " + $numEntries)

# Create a ZipEntry object that will be reused
# for each entry retrieved by EntryAt.
$entry = New-Object Chilkat.ZipEntry

# Iterate over all ZIP entries.
$i = 0
while ($i -lt $numEntries) {

    # Retrieve the entry at index i.
    $success = $zip.EntryAt($i,$entry)
    if ($success -eq $false) {
        $($zip.LastErrorText)
        exit
    }

    $("Entry " + $i)
    $("  FileName: " + $entry.FileName)
    $("  Uncompressed Length: " + $entry.UncompressedLength)
    $("  Compressed Length: " + $entry.CompressedLength)
    $("")

    $i = $i + 1
}

# Sample output:
# 
# Entry 0
#   FileName: docs/readme.txt
#   Uncompressed Length: 1204
#   Compressed Length: 512
# 
# Entry 1
#   FileName: images/logo.png
#   Uncompressed Length: 84211
#   Compressed Length: 84102
# 

$zip.CloseZip()

$("Done.")