(VBScript) Download Object from Google Cloud Storage

Demonstrates how to download an object from Google Cloud Storage to a file.

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

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

' This example 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 
' scope "https://www.googleapis.com/auth/cloud-platform"

' In this example, Get Google Cloud Storage OAuth2 Access Token, 
' the service account access token was saved to a text file.  This example fetches the access token from the file..
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbToken = CreateObject("Chilkat.StringBuilder")
success = sbToken.LoadFile("qa_data/tokens/googleCloudStorageAccessToken.txt","utf-8")

' Send a GET equivalent to this curl command.

' curl -X GET \
'     -H "Authorization: Bearer [OAUTH2_TOKEN]" \
'     -o "[SAVE_TO_LOCATION]" \
'     "https://www.googleapis.com/storage/v1/b/[BUCKET_NAME]/o/[OBJECT_NAME]?alt=media"

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Http")
set http = CreateObject("Chilkat.Http")

http.AuthToken = sbToken.GetAsString()

' Construct a URL to download an object named "starfish.jpg" from the "chilkat-ocean" bucket.
success = http.SetUrlVar("bucket_name","chilkat-ocean")
success = http.SetUrlVar("object_name","starfish.jpg")
url = "https://www.googleapis.com/storage/v1/b/{$bucket_name}/o/{$object_name}?alt=media"

' If there is an error response, then we didn't actually download the file data,
' but instead we downloaded an error response..
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData")
set fileData = CreateObject("Chilkat.BinData")
success = http.DownloadBd(url,fileData)
If (success = 0) Then
    outFile.WriteLine(http.LastErrorText)
    WScript.Quit
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbErrorResponse = CreateObject("Chilkat.StringBuilder")
responseCode = http.LastStatus
If (responseCode = 401) Then
    outFile.WriteLine("If invalid credentials, then it is likely the access token expired.")
    outFile.WriteLine("Your app should automatically fetch a new access token and re-try.")
End If

If (responseCode <> 200) Then
    ' Get the error response
    success = sbErrorResponse.AppendBd(fileData,"utf-8",0,0)
    outFile.WriteLine("Error response code = " & responseCode)
    outFile.WriteLine("Error:")
    outFile.WriteLine(sbErrorResponse.GetAsString())
    WScript.Quit
End If

outFile.WriteLine("Success.")

' Save the downloaded data to a file.
success = fileData.WriteFile("qa_output/starfish.jpg")

outFile.Close