AutoIt

Streaming Download Large File to the Local Filesystem

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

Local $bSuccess = 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.

$oRest = ObjCreate("Chilkat.Rest")

;  Connect to the Azure Storage Blob Service
Local $bTls = True
Local $iPort = 443
Local $bAutoReconnect = True
;  In this example, the storage account name is "chilkat".
$bSuccess = $oRest.Connect("chilkat.file.core.windows.net",$iPort,$bTls,$bAutoReconnect)
If ($bSuccess <> True) Then
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

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

;  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".
$bSuccess = $oRest.SendReqNoBody("GET","/pip/somethingBig.zip")
If ($bSuccess <> True) Then
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

;  Read the response header.
Local $iResponseStatusCode = $oRest.ReadResponseHeader()
If ($iResponseStatusCode < 0) Then
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Response status code = " & $iResponseStatusCode & @CRLF)

;  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 ($iResponseStatusCode = 200) Then

    $oBodyStream = ObjCreate("Chilkat.Stream")

    ;  The stream's sink will be a file.
    $oBodyStream.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.
    $bSuccess = $oRest.ReadRespBodyStream($oBodyStream,True)
    If ($bSuccess <> True) Then
        ConsoleWrite($oRest.LastErrorText & @CRLF)
        Exit
    EndIf

    ConsoleWrite("Successfully received the large file." & @CRLF)

Else
Local $sErrResponse = $oRest.ReadRespBodyString()
    If ($oRest.LastMethodSuccess <> True) Then
        ConsoleWrite($oRest.LastErrorText & @CRLF)
    Else
        ConsoleWrite($sErrResponse & @CRLF)
    EndIf

EndIf