Unless otherwise configured, the client libraries useApplication Default Credentialsto 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 theUnifiedCredentialsOptionThe 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*Clientclasses:
[[["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 2025-09-04 UTC."],[[["\u003cp\u003eThe latest release candidate version is 2.37.0-rc, and multiple versions are available for reference, ranging from 2.11.0 to 2.36.0.\u003c/p\u003e\n"],["\u003cp\u003eBy default, client libraries use Application Default Credentials for authentication with Google Cloud Services, but this can be overridden if necessary.\u003c/p\u003e\n"],["\u003cp\u003eYou can override the default authentication by utilizing \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, as demonstrated in the example code with service account key files.\u003c/p\u003e\n"],["\u003cp\u003eExamples for overriding authentication are provided for various \u003ccode\u003e*Client\u003c/code\u003e classes, including \u003ccode\u003eCatalogServiceClient\u003c/code\u003e, \u003ccode\u003eContentServiceClient\u003c/code\u003e, \u003ccode\u003eDataScanServiceClient\u003c/code\u003e, \u003ccode\u003eDataTaxonomyServiceClient\u003c/code\u003e, \u003ccode\u003eDataplexServiceClient\u003c/code\u003e, and \u003ccode\u003eMetadataServiceClient\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe user should refer to the "Best practices for managing service account keys" guide and the "Authentication Components" for more information on managing service account keys and creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects, respectively.\u003c/p\u003e\n"]]],[],null,[]]
