Xojo Plugin

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

Xojo Plugin

Dim success As Boolean
success = False

Dim zip As New Chilkat.Zip

// Open an existing ZIP archive.
success = zip.OpenZip("qa_data/zips/documents.zip")
If (success = False) Then
    System.DebugLog(zip.LastErrorText)
    Return
End If

// Locate the PDF entry within the ZIP archive.
Dim entry As New Chilkat.ZipEntry

success = zip.EntryOf("docs/report.pdf",entry)
If (success = False) Then
    System.DebugLog("ZIP entry not found.")
    zip.CloseZip 
    Return
End If

// ------------------------------------------------------------
// Inflate the ZIP entry directly into a BinData object.
// 
// The uncompressed bytes are stored entirely in memory.
// 
Dim pdfData As New Chilkat.BinData

success = entry.UnzipToBd(pdfData)
If (success = False) Then
    System.DebugLog(entry.LastErrorText)
    Return
End If

System.DebugLog("Uncompressed size = " + Str(pdfData.NumBytes))
System.DebugLog("")

// ------------------------------------------------------------
// Optionally save the uncompressed bytes to a file.
// 
success = pdfData.WriteFile("qa_output/report.pdf")
If (success = False) Then
    System.DebugLog(pdfData.LastErrorText)
    Return
End If

zip.CloseZip 

System.DebugLog("PDF extracted successfully.")