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(Go) Download Object from Google Cloud StorageDemonstrates how to download an object from Google Cloud Storage to a file.
// 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.. sbToken := chilkat.NewStringBuilder() 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" http := chilkat.NewHttp() http.SetAuthToken(*sbToken.GetAsString()) // Construct a URL to download an object named "starfish.jpg" from the "chilkat-ocean" bucket. http.SetUrlVar("bucket_name","chilkat-ocean") 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.. fileData := chilkat.NewBinData() success := http.DownloadBd(url,fileData) if success == false { fmt.Println(http.LastErrorText()) sbToken.DisposeStringBuilder() http.DisposeHttp() fileData.DisposeBinData() return } sbErrorResponse := chilkat.NewStringBuilder() responseCode := http.LastStatus() if responseCode == 401 { fmt.Println("If invalid credentials, then it is likely the access token expired.") fmt.Println("Your app should automatically fetch a new access token and re-try.") } if responseCode != 200 { // Get the error response sbErrorResponse.AppendBd(fileData,"utf-8",0,0) fmt.Println("Error response code = ", responseCode) fmt.Println("Error:") fmt.Println(*sbErrorResponse.GetAsString()) sbToken.DisposeStringBuilder() http.DisposeHttp() fileData.DisposeBinData() sbErrorResponse.DisposeStringBuilder() return } fmt.Println("Success.") // Save the downloaded data to a file. success = fileData.WriteFile("qa_output/starfish.jpg") sbToken.DisposeStringBuilder() http.DisposeHttp() fileData.DisposeBinData() sbErrorResponse.DisposeStringBuilder() |
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