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::speech_v1::AdaptationClient(
google::cloud::speech_v1::MakeAdaptationConnection(options));
}
Follow these links to find examples for other *Client classes:
[[["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 document provides a list of available versions for the C++ Speech API, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The client libraries primarily use Application Default Credentials for authentication, but they can be overridden for specific use cases."],["You can override the default authentication by utilizing the `UnifiedCredentialsOption` and providing a service account key file."],["Examples of how to override authentication with a service account key file are provided for `speech_v1::AdaptationClient`, `speech_v1::SpeechClient`, and `speech_v2::SpeechClient`."],["For detailed information on managing service account keys and authentication components, refer to the linked best practices guide and documentation."]]],[]]
