Ruby

Unzip a ZIP Entry Directly into a BinData Object Using ZipEntry.UnzipToBd

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This example demonstrates how to use the ZipEntry.UnzipToBd method to inflate a ZIP entry directly into a BinData object.

The entry contents are uncompressed entirely in memory without creating a file on disk.

This is useful when:

• Processing ZIP entry data entirely in memory
• Avoiding temporary filesystem files
• Working with binary files such as images, PDFs, or certificates
• Passing uncompressed ZIP data directly to other APIs

The example opens a ZIP archive, locates a PDF entry, inflates it into a BinData object, and then writes the uncompressed bytes to a new file.

Suppose the ZIP archive contains:

docs/report.pdf

The entry is uncompressed directly into memory before optionally being saved to:

qa_output/report.pdf

Ruby

require 'chilkat'

success = false

zip = Chilkat::CkZip.new()

# Open an existing ZIP archive.
success = zip.OpenZip("qa_data/zips/documents.zip")
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# Locate the PDF entry within the ZIP archive.
entry = Chilkat::CkZipEntry.new()

success = zip.EntryOf("docs/report.pdf",entry)
if (success == false)
    print "ZIP entry not found." + "\n";
    zip.CloseZip()
    exit
end

# ------------------------------------------------------------
# Inflate the ZIP entry directly into a BinData object.
# 
# The uncompressed bytes are stored entirely in memory.
# 
pdfData = Chilkat::CkBinData.new()

success = entry.UnzipToBd(pdfData)
if (success == false)
    print entry.lastErrorText() + "\n";
    exit
end

print "Uncompressed size = " + pdfData.get_NumBytes().to_s() + "\n";
print "" + "\n";

# ------------------------------------------------------------
# Optionally save the uncompressed bytes to a file.
# 
success = pdfData.WriteFile("qa_output/report.pdf")
if (success == false)
    print pdfData.lastErrorText() + "\n";
    exit
end

zip.CloseZip()

print "PDF extracted successfully." + "\n";