(Lianja) 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

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llSuccess = .F.

loZip = createobject("CkZip")

// Open an existing ZIP archive.
llSuccess = loZip.OpenZip("qa_data/zips/documents.zip")
if (llSuccess = .F.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

// Locate the PDF entry within the ZIP archive.
loEntry = createobject("CkZipEntry")

llSuccess = loZip.EntryOf("docs/report.pdf",loEntry)
if (llSuccess = .F.) then
    ? "ZIP entry not found."
    loZip.CloseZip()
    release loZip
    release loEntry
    return
endif

// ------------------------------------------------------------
// Inflate the ZIP entry directly into a BinData object.
// 
// The uncompressed bytes are stored entirely in memory.
// 
loPdfData = createobject("CkBinData")

llSuccess = loEntry.UnzipToBd(loPdfData)
if (llSuccess = .F.) then
    ? loEntry.LastErrorText
    release loZip
    release loEntry
    release loPdfData
    return
endif

? "Uncompressed size = " + str(loPdfData.NumBytes)
? ""

// ------------------------------------------------------------
// Optionally save the uncompressed bytes to a file.
// 
llSuccess = loPdfData.WriteFile("qa_output/report.pdf")
if (llSuccess = .F.) then
    ? loPdfData.LastErrorText
    release loZip
    release loEntry
    release loPdfData
    return
endif

loZip.CloseZip()

? "PDF extracted successfully."


release loZip
release loEntry
release loPdfData