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 prior versions of the service directory documented, ranging down to version 2.11.0."],["Client libraries by default use Application Default Credentials to authenticate with Google Cloud Services, but this can be overridden."],["Authentication credentials can be overridden by providing the UnifiedCredentialsOption, demonstrated in an example using a service account key file."],["Examples for overriding authentication using a service account key are provided for both `servicedirectory_v1::LookupServiceClient` and `servicedirectory_v1::RegistrationServiceClient`."],["The best practices for managing service account keys guide should be consulted for more information."]]],[]]
