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Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile){ auto is = std::ifstream(keyfile); is.exceptions(std::ios::badbit);// Minimal error handling in examples auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()),{}); auto options = google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>( google::cloud::MakeServiceAccountCredentials(contents)); return google::cloud::tasks_v2::CloudTasksClient( google::cloud::tasks_v2::MakeCloudTasksConnection(options)); }
[[["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 2025-04-22 UTC."],[[["The latest version available is 2.37.0-rc, with links provided for documentation and details on overriding authentication for this version and many previous ones."],["The content focuses on how to override default authentication credentials, which are typically Application Default Credentials, when interacting with Google Cloud Services."],["You can override default authentication by using the `UnifiedCredentialsOption` and explicitly loading a service account key file, as demonstrated in the code example."],["For best practices on managing service account keys, refer to the provided link in the documentation."],["More details on creating `google::cloud::Credentials` objects can be found in the \"Authentication Components\" section, which is linked in the \"See Also\" part."]]],[]]
