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::servicedirectory_v1::LookupServiceClient(
google::cloud::servicedirectory_v1::MakeLookupServiceConnection(
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."],[[["The latest version available is 2.37.0-rc, with numerous other versions, such as 2.36.0, 2.35.0, and so on, all the way down to 2.11.0, each with its own corresponding documentation link."],["The default method for client libraries to authenticate with Google Cloud Services is via Application Default Credentials, but this can be overridden when needed."],["Authentication can be overridden by utilizing the `UnifiedCredentialsOption`, as demonstrated by the example that shows explicitly loading a service account key file."],["Examples for overriding credentials can also be found for `servicedirectory_v1::LookupServiceClient` and `servicedirectory_v1::RegistrationServiceClient`."],["For further information on the creation of `google::cloud::Credentials` objects, refer to the Authentication Components documentation."]]],[]]
