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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::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 2025-03-21 UTC."],[[["This page details how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services."],["The latest release candidate version is 2.37.0-rc, and the content lists all versions from this to 2.11.0."],["Users can override the default authentication by using the `UnifiedCredentialsOption` and loading a service account key file."],["Examples for overriding credentials using service account key files are available for `language_v1::LanguageServiceClient` and `language_v2::LanguageServiceClient`."],["For more information on managing service account keys and creating credentials objects, the page provides links to the best practices guide and the Authentication Components documentation, respectively."]]],[]]
