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::eventarc_publishing_v1::PublisherClient(
google::cloud::eventarc_publishing_v1::MakePublisherConnection(
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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis page provides documentation for various versions of the Eventarc C++ client library, with the latest release candidate being version 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe library versions range from 2.11.0 up to the latest release candidate, with each version offering access to the \u003ccode\u003eeventarc-override-authentication\u003c/code\u003e documentation.\u003c/p\u003e\n"],["\u003cp\u003eThe content describes how to override default authentication credentials using \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e when interacting with Google Cloud services.\u003c/p\u003e\n"],["\u003cp\u003eService account key files can be used to override the default credentials, exemplified with a code snippet that demonstrates loading a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eLinks to examples for \u003ccode\u003eeventarc_publishing_v1::PublisherClient\u003c/code\u003e and \u003ccode\u003eeventarc_v1::EventarcClient\u003c/code\u003e classes are provided to further demonstrate how to use service accounts, and a link to best practices is supplied.\u003c/p\u003e\n"]]],[],null,[]]
