PowerShell

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

PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$zip = New-Object Chilkat.Zip

# Open an existing ZIP archive.
$success = $zip.OpenZip("qa_data/zips/documents.zip")
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

# Locate the PDF entry within the ZIP archive.
$entry = New-Object Chilkat.ZipEntry

$success = $zip.EntryOf("docs/report.pdf",$entry)
if ($success -eq $false) {
    $("ZIP entry not found.")
    $zip.CloseZip()
    exit
}

# ------------------------------------------------------------
# Inflate the ZIP entry directly into a BinData object.
# 
# The uncompressed bytes are stored entirely in memory.
# 
$pdfData = New-Object Chilkat.BinData

$success = $entry.UnzipToBd($pdfData)
if ($success -eq $false) {
    $($entry.LastErrorText)
    exit
}

$("Uncompressed size = " + $pdfData.NumBytes)
$("")

# ------------------------------------------------------------
# Optionally save the uncompressed bytes to a file.
# 
$success = $pdfData.WriteFile("qa_output/report.pdf")
if ($success -eq $false) {
    $($pdfData.LastErrorText)
    exit
}

$zip.CloseZip()

$("PDF extracted successfully.")