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::kms_inventory_v1::KeyDashboardServiceClient(
google::cloud::kms_inventory_v1::MakeKeyDashboardServiceConnection(
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 2025-04-17 UTC."],[[["This document provides a version history for the C++ Key Management Service (KMS) client library, detailing versions from 2.10.1 up to the latest release candidate 2.37.0-rc."],["The document explains how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services by using the `UnifiedCredentialsOption`."],["The content demonstrates explicitly loading a service account key file as an example of overriding authentication credentials, showing a code snippet to do so."],["Links are provided to code examples for different client classes, including `KeyDashboardServiceClient`, `KeyTrackingServiceClient`, `EkmServiceClient`, and `KeyManagementServiceClient`, all under version 2.15.1."],["For best practices on handling service accounts, the user is directed to the \"Best practices for managing service account keys\" guide and to the \"Authentication Components\" for more details."]]],[]]
