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::asset_v1::AssetServiceClient(
google::cloud::asset_v1::MakeAssetServiceConnection(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 page provides documentation for various versions of the C++ Asset API, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc."],["The latest stable version of the Asset API is 2.36.0, as indicated by the list of available versions, and the latest release candidate is 2.37.0-rc."],["The documentation details how to override default authentication using the `UnifiedCredentialsOption`, specifically by loading a service account key file."],["Default authentication for client libraries uses Application Default Credentials, but in some cases it is required to override them, as detailed on this page."],["The provided code snippet demonstrates explicitly loading a service account key file to override the default authentication method, using `MakeServiceAccountCredentials`, and the page also links to the official guide on service account keys."]]],[]]