Xbase++

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

See more Zip Examples

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

Xbase++

LOCAL nSuccess
LOCAL oZip
LOCAL oEntry
LOCAL oPdfData

nSuccess := 0

oZip := CreateObject("Chilkat.Zip")

//  Open an existing ZIP archive.
nSuccess := oZip:OpenZip("qa_data/zips/documents.zip")
IF (nSuccess == 0)
    ? oZip:LastErrorText
    oZip:destroy()
    RETURN
ENDIF

//  Locate the PDF entry within the ZIP archive.
oEntry := CreateObject("Chilkat.ZipEntry")

nSuccess := oZip:EntryOf("docs/report.pdf", oEntry)
IF (nSuccess == 0)
    ? "ZIP entry not found."
    oZip:CloseZip()
    oZip:destroy()
    oEntry:destroy()
    RETURN
ENDIF

//  ------------------------------------------------------------
//  Inflate the ZIP entry directly into a BinData object.
//  
//  The uncompressed bytes are stored entirely in memory.
//  
oPdfData := CreateObject("Chilkat.BinData")

nSuccess := oEntry:UnzipToBd(oPdfData)
IF (nSuccess == 0)
    ? oEntry:LastErrorText
    oZip:destroy()
    oEntry:destroy()
    oPdfData:destroy()
    RETURN
ENDIF

? "Uncompressed size = " + Str(oPdfData:NumBytes)
? ""

//  ------------------------------------------------------------
//  Optionally save the uncompressed bytes to a file.
//  
nSuccess := oPdfData:WriteFile("qa_output/report.pdf")
IF (nSuccess == 0)
    ? oPdfData:LastErrorText
    oZip:destroy()
    oEntry:destroy()
    oPdfData:destroy()
    RETURN
ENDIF

oZip:CloseZip()

? "PDF extracted successfully."

oZip:destroy()
oEntry:destroy()
oPdfData:destroy()