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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 2025-03-14 UTC."],[[["The webpage provides documentation for overriding default authentication credentials when interacting with Google Cloud Services."],["The most current version available is 2.37.0-rc, with a variety of previous versions also available, all listed with links for additional information."],["You can override the default authentication by using the `UnifiedCredentialsOption`, as demonstrated with an example of loading a service account key file."],["The client libraries typically utilize Application Default Credentials for authentication unless otherwise configured."],["Refer to the \"Best practices for managing service account keys\" guide for more detailed instructions on this process."]]],[]]
