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::translate_v3::TranslationServiceClient(
google::cloud::translate_v3::MakeTranslationServiceConnection(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 latest version available is 2.37.0-rc, with links provided for all available versions from 2.37.0-rc down to 2.11.0."],["By default, client libraries use Application Default Credentials for authentication with Google Cloud Services, but this can be overridden when necessary."],["You can override the default authentication by supplying a `UnifiedCredentialsOption`, such as loading a service account key file directly, which is shown in the provided example code."],["For detailed guidance on handling service account keys, refer to the \"Best practices for managing service account keys\" guide, and for further information on creating credentials objects, explore the Authentication Components section."],["The example shows how to load a service account key file, and while this is a straightforward approach, users should consult best practices for managing these keys."]]],[]]
