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::kms_inventory_v1::KeyDashboardServiceClient(
google::cloud::kms_inventory_v1::MakeKeyDashboardServiceConnection(
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 2025-03-05 UTC."],[[["This document provides information on how to override the default authentication credentials used by client libraries to interact with Google Cloud Services."],["The default authentication method is the Application Default Credentials, but this can be overridden using the `UnifiedCredentialsOption`."],["An example is provided that demonstrates how to load a service account key file to authenticate."],["Examples for other client classes like `kms_inventory_v1::KeyDashboardServiceClient`, `kms_inventory_v1::KeyTrackingServiceClient`, `kms_v1::EkmServiceClient`, and `kms_v1::KeyManagementServiceClient` are available via links."],["There are multiple versions of the documentation, with 2.37.0-rc being the latest release candidate, and going as far back as version 2.10.1."]]],[]]