(PowerBuilder) 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

integer li_rc
oleobject loo_SbToken
oleobject loo_Http
string ls_Url
oleobject loo_FileData
integer li_Success
oleobject loo_SbErrorResponse
integer li_ResponseCode

// 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..
loo_SbToken = create oleobject
// Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
li_rc = loo_SbToken.ConnectToNewObject("Chilkat.StringBuilder")
if li_rc < 0 then
    destroy loo_SbToken
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_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"

loo_Http = create oleobject
// Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
li_rc = loo_Http.ConnectToNewObject("Chilkat.Http")

loo_Http.AuthToken = loo_SbToken.GetAsString()

// Construct a URL to download an object named "starfish.jpg" from the "chilkat-ocean" bucket.
loo_Http.SetUrlVar("bucket_name","chilkat-ocean")
loo_Http.SetUrlVar("object_name","starfish.jpg")
ls_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..
loo_FileData = create oleobject
// Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
li_rc = loo_FileData.ConnectToNewObject("Chilkat.BinData")

li_Success = loo_Http.DownloadBd(ls_Url,loo_FileData)
if li_Success = 0 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_SbToken
    destroy loo_Http
    destroy loo_FileData
    return
end if

loo_SbErrorResponse = create oleobject
// Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
li_rc = loo_SbErrorResponse.ConnectToNewObject("Chilkat.StringBuilder")

li_ResponseCode = loo_Http.LastStatus
if li_ResponseCode = 401 then
    Write-Debug "If invalid credentials, then it is likely the access token expired."
    Write-Debug "Your app should automatically fetch a new access token and re-try."
end if

if li_ResponseCode <> 200 then
    // Get the error response
    loo_SbErrorResponse.AppendBd(loo_FileData,"utf-8",0,0)
    Write-Debug "Error response code = " + string(li_ResponseCode)
    Write-Debug "Error:"
    Write-Debug loo_SbErrorResponse.GetAsString()
    destroy loo_SbToken
    destroy loo_Http
    destroy loo_FileData
    destroy loo_SbErrorResponse
    return
end if

Write-Debug "Success."

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


destroy loo_SbToken
destroy loo_Http
destroy loo_FileData
destroy loo_SbErrorResponse