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::batch_v1::BatchServiceClient(
google::cloud::batch_v1::MakeBatchServiceConnection(options));
}
[[["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 a comprehensive list of available versions for the C++ Batch client library, ranging from the latest release candidate (2.37.0-rc) down to version 2.11.0."],["The document explains how to override the default authentication credentials, which use Application Default Credentials, by providing a UnifiedCredentialsOption."],["An example of explicitly loading a service account key file is provided, highlighting the use of `google::cloud::MakeServiceAccountCredentials`."],["It is suggested to consult the \"Best practices for managing service account keys\" guide for more details on securing service account keys, as well as the \"Authentication Components\" section for creating `google::cloud::Credentials` objects."]]],[]]
