(Visual Basic 6.0) 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

' 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..
Dim sbToken As New ChilkatStringBuilder
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"

Dim http As New ChilkatHttp

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")
Dim url As String
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..
Dim fileData As New ChilkatBinData
Dim success As Long
success = http.DownloadBd(url,fileData)
If (success = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Dim sbErrorResponse As New ChilkatStringBuilder
Dim responseCode As Long
responseCode = http.LastStatus
If (responseCode = 401) Then
    Debug.Print "If invalid credentials, then it is likely the access token expired."
    Debug.Print "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)
    Debug.Print "Error response code = " & responseCode
    Debug.Print "Error:"
    Debug.Print sbErrorResponse.GetAsString()
    Exit Sub
End If

Debug.Print "Success."

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