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(PowerShell) Unzip One File to a Stream

Demonstrates how to unzip a particular file contained within a .zip archive to a Chilkat stream.

Note: This example requires Chilkat v9.5.0.67 or greater.

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[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

#  This requires the Chilkat Zip API to have been previously unlocked.
#  See Unlock Chilkat Zip for sample code.

$zip = New-Object Chilkat.Zip

#  First open a .zip.
$success = $zip.OpenZip("qa_data/hamlet.zip")
if ($success -ne $true) {
    $($zip.LastErrorText)
    exit
}

#  Find the entry to be unzipped to a stream..
$entry = $zip.FirstMatchingEntry("*hamlet.xml")
if ($zip.LastMethodSuccess -ne $true) {
    $($zip.LastErrorText)
    exit
}

#  There are three ways we can unzip (inflate) to a stream.
# 
#  1) Set a sink file on the stream object and call UnzipToStream synchronously.
#     This unzips to the stream's sink (which is to simply unzip to a file in the filesystem).
# 
#  2) Create a stream object and call UnzipToStreamAsync.  This starts the unzip in a background
#     thread (after Task.Run is called).  Your application can then read the unzipped (inflated) file
#     directly from the stream.
# 
#  3) (not shown in this example) Unzip to a stream object that is the source of something else.
# 

#  ----------------------------------------------------------------
#  Case 1: Unzip to a file by setting the sink of streamA to a file.
$streamA = New-Object Chilkat.Stream
$streamA.SinkFile = "qa_output/hamletA.xml"

$success = $entry.UnzipToStream($streamA)
if ($success -ne $true) {
    $($entry.LastErrorText)

    exit
}

#  ----------------------------------------------------------------
#  Case 2a: Uzip to a stream asynchronously.
$streamB = New-Object Chilkat.Stream

$unzipTask = $entry.UnzipToStreamAsync($streamB)
if ($entry.LastMethodSuccess -ne $true) {
    $($entry.LastErrorText)

    exit
}

#  Start the background unzip thread.
$unzipTask.Run()

#  Read the stream.  (this is reading the unzipped file data)
$sb = New-Object Chilkat.StringBuilder
while ($streamB.EndOfStream -ne $true) {
    #  Each call to ReadSb appends to the contents of sb.
    $streamB.ReadSb($sb)
}

$sb.WriteFile("qa_output/hamletB.xml","utf-8",$false)

$("Success.")

#  ----------------------------------------------------------------
#  Case 2b: Uzip to a stream asynchronously and emit output while reading.
$streamC = New-Object Chilkat.Stream

$unzipTask = $entry.UnzipToStreamAsync($streamC)
if ($entry.LastMethodSuccess -ne $true) {
    $($entry.LastErrorText)

    exit
}

$unzipTask.Run()

while ($streamC.EndOfStream -ne $true) {
    $s = $streamC.ReadString()
    $($s)
}

$("Success.")

 

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