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::networkservices_v1::DepServiceClient(
google::cloud::networkservices_v1::MakeDepServiceConnection(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 2025-03-21 UTC."],[[["This page details how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services when using C++ client libraries."],["You can override the default credentials by using the `UnifiedCredentialsOption` and providing a service account key file, as demonstrated in the example code snippet."],["The page offers a comprehensive list of C++ client library versions, ranging from 2.12.0 to the latest release candidate 2.37.0-rc, each with its own documentation."],["The provided links on the page also offer examples on how to do this within `networkservices_v1::DepServiceClient` and `networkservices_v1::NetworkServicesClient` class objects."],["It is recommended to see the Best practices for managing service account keys guide for further details, along with the Authentication Components page for information on creating `google::cloud::Credentials` objects."]]],[]]
