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 2025-03-14 UTC."],[[["The webpage primarily provides a list of available versions, ranging from 2.11.0 to the latest release candidate 2.37.0-rc, with links to the documentation for each version related to batch authentication override."],["The content explains how to override the default authentication credentials by using the `UnifiedCredentialsOption` when interacting with Google Cloud Services."],["A service account key file can be explicitly loaded to override default credentials, as demonstrated by a code example showcasing how to create a `BatchServiceClient` with specific credentials."],["Users are advised to refer to the \"Best practices for managing service account keys\" guide for further details on service account key management."],["Additional information about the creation of `google::cloud::Credentials` objects can be found within the Authentication Components documentation, as mentioned in the \"See Also\" section."]]],[]]
