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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 release candidate version is 2.37.0-rc, with the most recent stable release being 2.36.0."],["The client libraries primarily use Application Default Credentials for Google Cloud service authentication, but this can be overridden."],["Authentication can be overridden by providing the `UnifiedCredentialsOption`, such as by loading a service account key file, as shown in the code example."],["The `Authentication Components` page offers further details on creating `google::cloud::Credentials` objects."],["Refer to the `Best practices for managing service account keys` guide for more information regarding service accounts."]]],[]]
