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::language_v1::LanguageServiceClient(
google::cloud::language_v1::MakeLanguageServiceConnection(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 2025-03-14 UTC."],[[["This document details how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services, which is done by using `UnifiedCredentialsOption`."],["The latest release candidate version is 2.37.0-rc, and the document lists a range of past versions from 2.36.0 to 2.11.0 for the language client libraries."],["An example is provided to illustrate how to load a service account key file explicitly to override the default credentials, which can be adapted for other client classes such as `language_v1::LanguageServiceClient` and `language_v2::LanguageServiceClient`."],["The `Authentication Components` section and the \"Best practices for managing service account keys\" guide are available for more information about creating credentials and managing keys respectively."]]],[]]
