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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::resourcesettings_v1::ResourceSettingsServiceClient( google::cloud::resourcesettings_v1:: MakeResourceSettingsServiceConnection(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 2025-03-21 UTC."],[[["This webpage provides documentation for various versions of the Resource Settings service, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The primary focus is on how to override the default authentication credentials used by the client libraries, which typically rely on Application Default Credentials (ADC)."],["You can override these default credentials by utilizing the `UnifiedCredentialsOption`, including an example demonstrating how to load credentials from a service account key file."],["The page links to further information on managing service account keys and authentication components, such as factory functions for creating `google::cloud::Credentials` objects."]]],[]]
