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::scheduler_v1::CloudSchedulerClient(
google::cloud::scheduler_v1::MakeCloudSchedulerConnection(options));
}
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThe latest version of the scheduler documentation is 2.37.0-rc, with various older versions available, ranging down to version 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003eBy default, client libraries use Application Default Credentials (ADC) for authentication with Google Cloud Services.\u003c/p\u003e\n"],["\u003cp\u003eYou can override the default authentication credentials by using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, which allows you to specify alternative credentials like a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eThe provided code demonstrates how to explicitly load a service account key file using \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e and \u003ccode\u003eMakeServiceAccountCredentials\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eFor in-depth information on creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects and managing service account keys, refer to the Authentication Components documentation and the service account key management guide.\u003c/p\u003e\n"]]],[],null,[]]
