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REST Receive Response in Chunks

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Demonstrates how to receive a REST HTTP response in chunks.

Note: This example requires Chilkat 10.1.0 or greater.

PowerShell

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

$success = $false

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

$rest = New-Object Chilkat.Rest

# Connect to the web server
$bTls = $true
$port = 443
$bAutoReconnect = $true
$success = $rest.Connect("chilkatsoft.com",$port,$bTls,$bAutoReconnect)
if ($success -eq $false) {
    $($rest.LastErrorText)
    exit
}

# Send the request.
# This can be *any* kind of request: POST, GET, PUT, etc. using *any* of the Chilkat REST methods that send requests.
# For this example, we'll just GET a simple XML document that is about 274K in size.

$success = $rest.SendReqNoBody("GET","/hamlet.xml")
if ($success -eq $false) {
    $($rest.LastErrorText)
    exit
}

# Get the response header.
$statusCode = $rest.ReadResponseHeader()
if ($statusCode -lt 0) {
    $($rest.LastErrorText)
    exit
}

$("response status code = " + $statusCode)

$outputFile = "c:/temp/qa_output/hamlet.xml"

$fac = New-Object Chilkat.FileAccess
$success = $fac.OpenForWrite($outputFile)
if ($statusCode -lt 0) {
    $($fac.LastErrorText)
    exit
}

# Get the response in chunks.
# (Note: There are more efficient ways to simply download a file from a web server, such as by calling Chilkat's Http.Download method.
# The purpose of this method is to show how to receive a response chunk-by-chunk.)
$bd = New-Object Chilkat.BinData
$status = 1
while ($status -eq 1) {
    # Read a minimum of 16000 bytes.
    # Note: Because of TLS message lengths, or the possibility of the response being either compressed (gzip/deflate) or in the HTTP chunked encoding,
    # the amount of data received in each call can be greater than the specified min size.
    # Chilkat will return from the call as soon as it has received an amount equal to or more than the specified size,
    # except for the very last chunk, which can be less that the min size or even 0 bytes.

    # The status will be one of three values:
    # -1 = error
    # 0 = received the last chunk of the response.
    # 1 = received a chunk, and more chunks are coming..

    # The received data is *appended* to the contents of the BinData object.
    $status = $rest.ReadRespChunkBd(16000,$bd)
    if ($status -ge 0) {
        $("Received chunk: " + $bd.NumBytes + " bytes")
        $fac.FileWriteBd($bd,0,0)
        $bd.Clear()
    }

}

$fac.FileClose()

$("Success.")