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::policytroubleshooter_iam_v3::
PolicyTroubleshooterClient(
google::cloud::policytroubleshooter_iam_v3::
MakePolicyTroubleshooterConnection(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"]],[["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 2025-03-14 UTC."],[[["This page provides documentation for the Policy Troubleshooter service, with multiple versions available, including the latest release candidate, 2.37.0-rc, and down to version 2.11.0."],["The content explains how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud services by using the `UnifiedCredentialsOption`."],["A specific example demonstrates how to load a service account key file to override authentication settings."],["The page also directs users to examples for other client classes, such as `policytroubleshooter_iam_v3::PolicyTroubleshooterClient` and `policytroubleshooter_v1::IamCheckerClient`."],["Users can access more information on creating `google::cloud::Credentials` objects through the Authentication Components section."]]],[]]