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::osconfig_agentendpoint_v1::AgentEndpointServiceClient(
google::cloud::osconfig_agentendpoint_v1::
MakeAgentEndpointServiceConnection(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 document provides versioned documentation for the OS Config C++ client library, with the latest release candidate being version 2.37.0-rc and the current displayed version being 2.26.0."],["The content explains how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud services using the `UnifiedCredentialsOption`."],["A service account key file can be explicitly loaded to override default credentials, as demonstrated in the provided code example that uses `MakeServiceAccountCredentials`."],["Examples are provided for overriding credentials with the `AgentEndpointServiceClient`, `OsConfigServiceClient`, and `OsConfigZonalServiceClient` client classes."],["The document references best practices and provides additional resources to better understand the factory functions needed to create `google::cloud::Credentials`."]]],[]]