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 documents the history of the Google Cloud C++ client library versions for the Translation API, listing all available versions from 2.11.0 to the latest release candidate 2.37.0-rc."],["The latest stable version of the Translation API documented on this page is 2.36.0, with 2.37.0-rc as the most recent release candidate."],["The document details how to override default authentication credentials for Google Cloud services using the `UnifiedCredentialsOption` by loading a service account key file."],["The provided code example demonstrates how to load a service account key file and use it to create a `TranslationServiceClient` with custom credentials, referencing best practices for managing service account keys."],["For additional information regarding the creation of `google::cloud::Credentials` objects, the `Authentication Components` section is recommended."]]],[]]