PowerShell

Transition from BeginCompressStringENC to FirstChunk/LastChunk

Provides instructions for replacing deprecated BeginCompressStringENC method calls with using FirstChunk/LastChunk properties. PowerShell

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

$success = $false

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$sbCompressedBase64 = New-Object Chilkat.StringBuilder

$compress = New-Object Chilkat.Compression
$compress.Algorithm = "deflate"
$compress.Charset = "utf-8"
$compress.EncodingMode = "base64"

$sbIndex = New-Object Chilkat.StringBuilder

# ----------------------------------------------------------------------------------
# This is the deprecated way of compressing in chunks using Begin/More/End methods..
# ----------------------------------------------------------------------------------

for ($i = 0; $i -le 24; $i++) {
    # Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
    # an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
    # in a subsequent call.
    $sbIndex.Clear()
    $sbIndex.AppendInt($i)
    if ($i -eq 0) {
        $sbCompressedBase64.Append($compress.BeginCompressStringENC($sbIndex.GetAsString()))
    }
    else {
        $sbCompressedBase64.Append($compress.MoreCompressStringENC($sbIndex.GetAsString()))
    }

    $sbCompressedBase64.Append($compress.MoreCompressStringENC(": This is a line of data to be compressed...`r`n"))
}

# Flush any remaining output.
$sbCompressedBase64.Append($compress.EndCompressStringENC())

$("The base64 encoded compressed text:")
$($sbCompressedBase64.GetAsString())

# Decompress in one call:
$originalText = $compress.DecompressStringENC($sbCompressedBase64.GetAsString())
$($originalText)

# ----------------------------------------------------------------------------------
# This is new way of compressing in chunks using FirstChunk and LastChunk properties
# ----------------------------------------------------------------------------------

$sbCompressedBase64.Clear()

$compress.FirstChunk = $true
$compress.LastChunk = $false

$bdCompressed = New-Object Chilkat.BinData
$sbUncompressedChunk = New-Object Chilkat.StringBuilder

for ($i = 0; $i -le 24; $i++) {
    if ($i -eq 24) {
        $compress.LastChunk = $true
    }

    $sbUncompressedChunk.Clear()
    $sbUncompressedChunk.AppendInt($i)
    $sbUncompressedChunk.Append(": This is a line of data to be compressed...`r`n")

    $compress.CompressSb($sbUncompressedChunk,$bdCompressed)

    $compress.FirstChunk = $false
}

$("The base64 encoded compressed text:")
$($bdCompressed.GetEncoded("base64"))

# Decompress in one call:
$originalText = $compress.DecompressStringENC($bdCompressed.GetEncoded("base64"))
$($originalText)