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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::texttospeech_v1::TextToSpeechClient( google::cloud::texttospeech_v1::MakeTextToSpeechConnection(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 2025-04-01 UTC."],[[["The latest release candidate version is 2.37.0-rc, and a list of other available versions are shown, ranging down to version 2.11.0."],["The client libraries use Application Default Credentials (ADC) for authentication with Google Cloud Services unless explicitly configured otherwise."],["You can override default authentication by utilizing the UnifiedCredentialsOption to explicitly load credentials such as a service account key file."],["The provided example showcases loading credentials from a service account key file using `google::cloud::UnifiedCredentialsOption`."],["For more details on creating `google::cloud::Credentials` objects, you can refer to the Authentication Components section."]]],[]]
