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::dataplex_v1::CatalogServiceClient(
google::cloud::dataplex_v1::MakeCatalogServiceConnection(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 2025-03-05 UTC."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud client libraries for C++."],["The latest version of the documentation available is 2.37.0-rc, with a history of previous versions dating back to 2.11.0 listed."],["Users can override the default authentication method, Application Default Credentials, by using the `UnifiedCredentialsOption` to explicitly load a service account key file."],["Examples of how to implement this override are provided for various `*Client` classes, such as `CatalogServiceClient`, `ContentServiceClient`, `DataScanServiceClient`, `DataTaxonomyServiceClient`, `DataplexServiceClient`, and `MetadataServiceClient`."],["The page directs readers to the \"Best practices for managing service account keys\" guide and to the Authentication Components documentation for additional information and best practices."]]],[]]
