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, covering versions from 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The main focus of this page is on how to override the default Application Default Credentials (ADC) used by client libraries for authentication with Google Cloud Services."],["Users can override authentication by using the `UnifiedCredentialsOption` and providing a service account key file, as demonstrated in the provided code example."],["Examples for other client classes, specifically `policytroubleshooter_iam_v3::PolicyTroubleshooterClient` and `policytroubleshooter_v1::IamCheckerClient`, are available through the given links."],["Refer to the \"Best practices for managing service account keys\" guide and \"Authentication Components\" for more detailed information on managing credentials and service account keys."]]],[]]