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Showing content from http://cloud.google.com/cpp/docs/reference/storage/2.35.0/storage-auth-example below:

C++ Client Libraries | Google Cloud

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Override the authentication configuration

Some applications cannot use the default authentication mechanism (known as Application Default Credentials). You can override this default using google::cloud::UnifiedCredentialsOption. The following example shows how to explicitly load a service account key file.

  namespace gcs = ::google::cloud::storage;
  [](std::string const& filename, std::string const& bucket_name,
     std::string const& object_name) {
    auto is = std::ifstream(filename);
    is.exceptions(std::ios::badbit);
    auto json_string =
        std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto credentials =
        google::cloud::MakeServiceAccountCredentials(json_string);
    auto client = gcs::Client(
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            credentials));
    PerformSomeOperations(client, bucket_name, object_name);
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.

See Also

Authentication Components - for more information on the factory functions to create google::cloud::Credentials objects.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["The page provides access to documentation for various versions of a C++ library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["Users can find specific documentation for each version by following the provided links, for example, version 2.35.0 located at `/cpp/docs/reference/storage/2.35.0/storage-auth-example`."],["The content explains how to override the default authentication mechanism, known as Application Default Credentials, using `google::cloud::UnifiedCredentialsOption`."],["An example demonstrates how to load a service account key file to explicitly define credentials, using `google::cloud::MakeServiceAccountCredentials`."],["The documentation also provides a link to best practices for service account keys and a link to the Authentication Components page for more information on `google::cloud::Credentials`."]]],[]]

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