(Ruby) Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

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This example demonstrates how to iterate through all entries in a ZIP archive using:

• Zip.EntryAt to obtain the first entry
• ZipEntry.GetNext to advance through the remaining entries

The example prints each ZIP entry's stored filename and whether the entry is a file or directory.

This approach is useful when sequentially processing ZIP entries without repeatedly calling EntryAt by index.

Suppose the ZIP archive contains:

docs/
docs/readme.txt
images/logo.png
hello.txt

The example iterates through each entry in the order stored within the ZIP archive.

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

require 'chilkat'

success = false

zip = Chilkat::CkZip.new()

# Open an existing ZIP archive.
success = zip.OpenZip("c:/temp/example.zip")
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# A ZIP archive may contain zero entries.
if (zip.get_NumEntries() == 0)

    print "The ZIP archive is empty." + "\n";

    zip.CloseZip()
    exit
end

# ------------------------------------------------------------
# Get the first ZIP entry.
# 
# EntryAt(0,entry) initializes the ZipEntry object so that
# it represents the first entry in the ZIP archive.
# 
entry = Chilkat::CkZipEntry.new()

success = zip.EntryAt(0,entry)
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# ------------------------------------------------------------
# Iterate through all ZIP entries.
# 
# GetNext updates the same ZipEntry object so that it
# represents the next entry in the ZIP archive.
# 
while (success == true)

    if (entry.get_IsDirectory() == true)

        print "[Directory] " + entry.fileName() + "\n";

    else

        print "[File] " + entry.fileName() + "\n";
    end

    # Advance to the next entry.
    success = entry.GetNext()
end

zip.CloseZip()

print "Done." + "\n";