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."],[[["This page lists different versions of the C++ translation client library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc, with links to their respective documentation pages on how to override authentication."],["By default, the client libraries use Application Default Credentials (ADC) to authenticate with Google Cloud Services, but this behavior can be overridden when necessary."],["Authentication can be overridden by providing the UnifiedCredentialsOption and loading a service account key file, as demonstrated in the provided C++ code example."],["The example code illustrates how to explicitly load a service account key file, but users should refer to the best practices guide for managing service account keys for detailed security recommendations."],["For more information on creating Credentials objects, you can consult the Authentication Components page."]]],[]]
