(Ruby) Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

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This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

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

# ------------------------------------------------------------
# First create a sample ZIP archive containing a small text file.

zip = Chilkat::CkZip.new()

success = zip.NewZip("c:/temp/sampleText.zip")
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# Add a small text file from memory.
# The text is stored in the ZIP as "hello.txt".
success = zip.AddString("hello.txt","Hello from a ZIP entry!","utf-8")
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# Write the ZIP archive to disk and close it.
success = zip.WriteZipAndClose()
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# ------------------------------------------------------------
# Now open the ZIP archive we just created.

zip2 = Chilkat::CkZip.new()

success = zip2.OpenZip("c:/temp/sampleText.zip")
if (success == false)
    print zip2.lastErrorText() + "\n";
    exit
end

# Get the text file entry.
entry = Chilkat::CkZipEntry.new()

success = zip2.EntryOf("hello.txt",entry)

if (success == false)
    print "Entry not found." + "\n";
    exit
end

# Get the compressed ZIP entry data as Base64.
# 
# This is the compressed data stored inside the ZIP file,
# not the uncompressed text "Hello from a ZIP entry!".
b64 = entry.copyToBase64()

print "Base64 compressed ZIP entry data:" + "\n";
print b64 + "\n";

zip2.CloseZip()

print "Done." + "\n";