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::resourcemanager_v3::FoldersClient(
google::cloud::resourcemanager_v3::MakeFoldersConnection(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 overriding default authentication credentials in Google Cloud C++ client libraries for the Resource Manager, specifically for versions ranging from 2.11.0 to 2.37.0-rc, and it focuses on overriding authentication for the resource manager."],["The C++ client libraries typically use Application Default Credentials for authentication, but this can be overridden when necessary by providing a `UnifiedCredentialsOption`."],["The documentation details how to explicitly load a service account key file to override default credentials, and it provides an example."],["Links to examples of overriding authentication for various `*Client` classes, such as `FoldersClient`, `OrganizationsClient`, `ProjectsClient`, and more, are available."],["Users are directed to the \"Best practices for managing service account keys\" guide for further guidance on managing service account keys, as well as further information on the Authentication Components."]]],[]]
