(Ruby) 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.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

success = false

success = false

# Open an existing ZIP archive.
zip = Chilkat::CkZip.new()

success = zip.OpenZip("example.zip")
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# Get the total number of entries in the ZIP archive.
numEntries = zip.get_NumEntries()

print "Number of ZIP entries = " + numEntries.to_s() + "\n";

# Create a ZipEntry object that will be reused
# for each entry retrieved by EntryAt.
entry = Chilkat::CkZipEntry.new()

# Iterate over all ZIP entries.
i = 0
while i < numEntries

    # Retrieve the entry at index i.
    success = zip.EntryAt(i,entry)
    if (success == false)
        print zip.lastErrorText() + "\n";
        exit
    end

    print "Entry " + i.to_s() + "\n";
    print "  FileName: " + entry.fileName() + "\n";
    print "  Uncompressed Length: " + entry.get_UncompressedLength().to_s() + "\n";
    print "  Compressed Length: " + entry.get_CompressedLength().to_s() + "\n";
    print "" + "\n";

    i = i + 1
end

# 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()

print "Done." + "\n";