PowerShell

Streaming Download Large File to the Local Filesystem

See more Azure Cloud Storage Examples

Downloads a large file in a streaming fashion to the local filesystem. PowerShell

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

$success = $false

# Azure File Service Example: Downloads a large file to the local filesystem using a Chilkat stream.
# See:  https://docs.microsoft.com/en-us/rest/api/storageservices/get-file

# 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 Azure Storage Blob Service
$bTls = $true
$port = 443
$bAutoReconnect = $true
# In this example, the storage account name is "chilkat".
$success = $rest.Connect("chilkat.file.core.windows.net",$port,$bTls,$bAutoReconnect)
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

# Provide Azure Cloud credentials for the REST calls.
$azAuth = New-Object Chilkat.AuthAzureStorage
$azAuth.AccessKey = "AZURE_ACCESS_KEY"
# The account name used here should match the 1st part of the domain passed in the call to Connect (above).
$azAuth.Account = "chilkat"
$azAuth.Scheme = "SharedKey"
$azAuth.Service = "File"
# This causes the "x-ms-version: 2021-08-06" header to be automatically added.
$azAuth.XMsVersion = "2021-08-06"
$success = $rest.SetAuthAzureStorage($azAuth)

# Note: The application does not need to explicitly set the following
# headers: x-ms-date, Authorization.  These headers
# are automatically set by Chilkat.

# When streaming a download to the local filesystem or directed elsewhere,
# the complete HTTP GET operation must be broken into parts.
# For example, an HTTP GET consists of sending the request, followed by reading the response header,
# and then finally the response body.  We'll want to read the response header, and then based
# on the information received (such as success or failure), either read the response body
# as an error message, or as the file data.

# Send the HTTP GET request to download the file.
# The share is named "pip".
$success = $rest.SendReqNoBody("GET","/pip/somethingBig.zip")
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

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

$("Response status code = " + $responseStatusCode)

# We expect a 200 response status if the file data is coming.
# Otherwise, we'll get a string response body with an error message(or no response body).
if ($responseStatusCode -eq 200) {

    $bodyStream = New-Object Chilkat.Stream

    # The stream's sink will be a file.
    $bodyStream.SinkFile = "qa_output/somethingBig.zip"

    # Read the response body to the stream.  Given that we've
    # set the stream's sink to a file, it will stream directly
    # to the file.
    $success = $rest.ReadRespBodyStream($bodyStream,$true)
    if ($success -ne $true) {
        $($rest.LastErrorText)
        exit
    }

    $("Successfully received the large file.")

}
else {
    $errResponse = $rest.ReadRespBodyString()
    if ($rest.LastMethodSuccess -ne $true) {
        $($rest.LastErrorText)
    }
    else {
        $($errResponse)
    }

}