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 available version is 2.37.0-rc, with multiple preceding versions ranging from 2.36.0 down to 2.11.0 available for reference."],["Client libraries typically use Application Default Credentials for Google Cloud Services, but you can override this with `UnifiedCredentialsOption`."],["You can override the default authentication by loading a service account key file, as demonstrated in the provided example using `MakeServiceAccountCredentials`."],["Examples for overriding authentication are available for `servicedirectory_v1::LookupServiceClient` and `servicedirectory_v1::RegistrationServiceClient` classes."],["The `Authentication Components` documentation provides more details on factory functions for creating `google::cloud::Credentials` objects."]]],[]]