(PowerShell) Unzip a Text File Entry into a StringBuilder Using ZipEntry.UnzipToSb

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This example demonstrates how to use the ZipEntry.UnzipToSb method to inflate a text file entry directly into a StringBuilder object.

The ZIP entry is uncompressed entirely in memory and appended to the StringBuilder without creating a temporary file on disk.

This is useful when:

• Processing text files directly in memory
• Avoiding temporary filesystem files
• Reading configuration files, JSON, XML, CSV, or source code from ZIP archives
• Automatically converting line endings while inflating the text

The srcCharset argument specifies how the uncompressed bytes should be interpreted, such as:

• utf-8
• utf-16
• windows-1252

The lineEndingBehavior argument controls line-ending conversion:

• 0 — Leave line endings unchanged
• 1 — Convert all line endings to bare LF
• 2 — Convert all line endings to CRLF

Suppose the ZIP archive contains:

config/settings.json

The example inflates the JSON file directly into a StringBuilder.

Chilkat .NET Downloads Chilkat .NET Assemblies

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

$success = $false

$zip = New-Object Chilkat.Zip

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

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

$success = $zip.EntryOf("config/settings.json",$entry)
if ($success -eq $false) {
    $("ZIP entry not found.")
    $zip.CloseZip()
    exit
}

# ------------------------------------------------------------
# Inflate the ZIP entry directly into a StringBuilder.
# 
# The uncompressed text is appended to the StringBuilder.
# 
$sb = New-Object Chilkat.StringBuilder

# Leave line endings unchanged.
$lineEndingBehavior = 0

# Interpret the uncompressed bytes as UTF-8 text.
$srcCharset = "utf-8"

$success = $entry.UnzipToSb($lineEndingBehavior,$srcCharset,$sb)
if ($success -eq $false) {
    $($entry.LastErrorText)
    exit
}

$("Uncompressed text:")
$("")
$($sb.GetAsString())

$zip.CloseZip()

$("Done.")