Xojo Plugin

Download Object from Google Cloud Storage

See more Google Cloud Storage Examples

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

Dim success As Boolean
success = False

// 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 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"

Dim http As New 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")
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 Chilkat.BinData
success = http.DownloadBd(url,fileData)
If (success = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

Dim sbErrorResponse As New Chilkat.StringBuilder
Dim responseCode As Int32
responseCode = http.LastStatus
If (responseCode = 401) Then
    System.DebugLog("If invalid credentials, then it is likely the access token expired.")
    System.DebugLog("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)
    System.DebugLog("Error response code = " + Str(responseCode))
    System.DebugLog("Error:")
    System.DebugLog(sbErrorResponse.GetAsString())
    Return
End If

System.DebugLog("Success.")

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