(PowerShell) Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

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This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

Note: This example requires Chilkat v11.0.0 or greater.

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

$success = $false

# ------------------------------------------------------------
# First create a sample ZIP archive containing a small text file.

$zip = New-Object Chilkat.Zip

$success = $zip.NewZip("c:/temp/sampleText.zip")
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

# Add a small text file from memory.
# The text is stored in the ZIP as "hello.txt".
$success = $zip.AddString("hello.txt","Hello from a ZIP entry!","utf-8")
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

# Write the ZIP archive to disk and close it.
$success = $zip.WriteZipAndClose()
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

# ------------------------------------------------------------
# Now open the ZIP archive we just created.

$zip2 = New-Object Chilkat.Zip

$success = $zip2.OpenZip("c:/temp/sampleText.zip")
if ($success -eq $false) {
    $($zip2.LastErrorText)
    exit
}

# Get the text file entry.
$entry = New-Object Chilkat.ZipEntry

$success = $zip2.EntryOf("hello.txt",$entry)

if ($success -eq $false) {
    $("Entry not found.")
    exit
}

# Get the compressed ZIP entry data as Base64.
# 
# This is the compressed data stored inside the ZIP file,
# not the uncompressed text "Hello from a ZIP entry!".
$b64 = $entry.CopyToBase64()

$("Base64 compressed ZIP entry data:")
$($b64)

$zip2.CloseZip()

$("Done.")