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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::batch_v1::BatchServiceClient( google::cloud::batch_v1::MakeBatchServiceConnection(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 2025-03-21 UTC."],[[["The latest version of the documentation is 2.37.0-rc, while the current viewed version is 2.22.1-rc, and a list of versions from 2.11.0 to 2.36.0 are also available."],["Client libraries typically use Application Default Credentials (ADC) for authentication with Google Cloud Services, but these defaults can be overridden."],["You can override default authentication by using `UnifiedCredentialsOption`, as demonstrated through the example of loading a service account key file."],["The provided code example shows how to load a service account key file to explicitly set authentication credentials, but you should consult best practices for service account key management."],["Additional details for factory functions to create `google::cloud::Credentials` can be found under the Authentication Components section."]]],[]]