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."],[[["The page provides documentation for overriding default authentication credentials in Google Cloud C++ client libraries for ResourceManager."],["Client libraries typically use Application Default Credentials, but you can override this by using `UnifiedCredentialsOption` to specify custom credentials."],["The example demonstrates loading credentials from a service account key file using `MakeServiceAccountCredentials` within the `UnifiedCredentialsOption`."],["Links are available to provide examples for `FoldersClient`, `OrganizationsClient`, and `ProjectsClient` classes using a service account."],["The page also directs you to \"Best practices for managing service account keys\" and \"Authentication Components\" for more details."]]],[]]
