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 2025-03-21 UTC."],[[["This page lists different versions of the C++ client library for Google Cloud Translation, ranging from version 2.11.0 to 2.37.0-rc, which is the latest release candidate."],["The documentation explains how to override the default authentication credentials, Application Default Credentials, used by the client libraries to interact with Google Cloud Services."],["Authentication override can be done by utilizing the `UnifiedCredentialsOption` to, for example, explicitly load a service account key file."],["It is recommended to refer to the \"Best practices for managing service account keys\" guide for proper management of service account keys when overriding authentication."],["For more details on creating `google::cloud::Credentials` objects, users can consult the \"Authentication Components\" section."]]],[]]