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::assuredworkloads_v1::AssuredWorkloadsServiceClient(
google::cloud::assuredworkloads_v1::
MakeAssuredWorkloadsServiceConnection(options));
}
[[["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 2025-08-14 UTC."],[[["\u003cp\u003eThis page lists various versions of the Assured Workloads C++ client library, with the latest being version 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe client libraries primarily use Application Default Credentials for Google Cloud service authentication, but this can be overridden.\u003c/p\u003e\n"],["\u003cp\u003eAuthentication credentials can be overridden by using the UnifiedCredentialsOption and providing a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eThe example code demonstrates how to load a service account key file to override default credentials, using the \u003ccode\u003eMakeServiceAccountCredentials\u003c/code\u003e function.\u003c/p\u003e\n"],["\u003cp\u003eFor detailed information on managing service account keys and authentication components, refer to the linked documentation on best practices and factory functions.\u003c/p\u003e\n"]]],[],null,[]]
