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::profiler_v2::ExportServiceClient(
google::cloud::profiler_v2::MakeExportServiceConnection(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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 overriding default authentication credentials when using Google Cloud client libraries, specifically focusing on the profiler service.\u003c/p\u003e\n"],["\u003cp\u003eThe latest release candidate for the profiler service is version 2.37.0-rc, while version 2.32.0 is presented as the current page's version with a dropdown to access previous versions.\u003c/p\u003e\n"],["\u003cp\u003eClient libraries use Application Default Credentials unless explicitly configured otherwise, and overriding involves using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation provides code examples for loading a service account key file and demonstrates this with the \u003ccode\u003eExportServiceClient\u003c/code\u003e and \u003ccode\u003eProfilerServiceClient\u003c/code\u003e classes, showing the implementation of service account credentials.\u003c/p\u003e\n"],["\u003cp\u003eIt is advised to refer to the best practices guide for managing service account keys, and links are provided for additional information regarding authentication components and factory functions to create \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects.\u003c/p\u003e\n"]]],[],null,[]]
