(AutoIt) Download File (Stream to Local Filesystem)

This example demonstrates how to download the content of a file from Google Drive. The file is streamed to the local filesystem.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Local $bSuccess = True

; It requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

; This example uses a previously obtained access token having permission for the 
; Google Drive scope.

$oGAuth = ObjCreate("Chilkat.AuthGoogle")
$oGAuth.AccessToken = "GOOGLE_DRIVE_ACCESS_TOKEN"

$oRest = ObjCreate("Chilkat.Rest")

; Connect using TLS.
; A single REST object, once connected, can be used for many Google Drive REST API calls.
; The auto-reconnect indicates that if the already-established HTTPS connection is closed,
; then it will be automatically re-established as needed.
Local $bAutoReconnect = True
$bSuccess = $oRest.Connect("www.googleapis.com",443,True,$bAutoReconnect)

; Provide the authentication credentials (i.e. the access token)
$oRest.SetAuthGoogle($oGAuth)

; ------------------------------------------------------------------------------
; To download a file, we must know the file ID.
; In a previous example (see Build Local Metadata Cache
; we built a local cache to make it easy to lookup file IDs given a file path.
; Let's say we want to download "testFolder/abc/123/penguins.jpg".
; First we lookup the fileId in the cache.  With the fileId, we can download the file.
$oGdCache = ObjCreate("Chilkat.Cache")
$oGdCache.Level = 0
$oGdCache.AddRoot "C:/ckCache/googleDrive"

Local $sFileId = $oGdCache.FetchText("testFolder/abc/123/penguins.jpg")
If ($oGdCache.LastMethodSuccess <> True) Then
    ConsoleWrite("Filepath not found in cache." & @CRLF)
    Exit
EndIf

; We need to send a GET request like this:
; GET https://www.googleapis.com/drive/v3/files/fileId?alt=media
; The fileId is part of the path.
$oSbPath = ObjCreate("Chilkat.StringBuilder")
$oSbPath.Append("/drive/v3/files/")
$oSbPath.Append($sFileId)
$oRest.AddQueryParam("alt","media")

; Create a stream object with a SinkFile set to the path where the downloaded file will go.
$oFileStream = ObjCreate("Chilkat.Stream")
$oFileStream.SinkFile = "qa_output/penguins.jpg"
; Indicate that the response body should stream directly to fileStream,
; but only if the response status is 200.  
$oRest.SetResponseBodyStream(200,True,$oFileStream)

; Download the file, streaming the content to the SinkFile.
Local $sJsonResponse = $oRest.FullRequestNoBody("GET",$oSbPath.GetAsString())
If ($oRest.LastMethodSuccess <> True) Then
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

; A successful response will have a status code equal to 200.
If ($oRest.ResponseStatusCode <> 200) Then
    ConsoleWrite("response status code = " & $oRest.ResponseStatusCode & @CRLF)
    ConsoleWrite("response status text = " & $oRest.ResponseStatusText & @CRLF)
    ConsoleWrite("response header: " & $oRest.ResponseHeader & @CRLF)
    Exit
EndIf

ConsoleWrite("File downloaded." & @CRLF)