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::workflows_executions_v1::ExecutionsClient(
google::cloud::workflows_executions_v1::MakeExecutionsConnection(
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 2025-04-17 UTC."],[[["This document provides guidance on overriding default authentication credentials when interacting with Google Cloud Services using C++ client libraries."],["The latest version of the documentation is for version 2.37.0-rc, and documentation is available for multiple previous versions, ranging down to 2.11.0."],["By utilizing the `UnifiedCredentialsOption`, users can override the default Application Default Credentials (ADC) and provide custom authentication methods, such as loading a service account key file."],["The document includes example code demonstrating how to explicitly load a service account key file and create a `ExecutionsClient` with custom authentication."],["For more information on managing service account keys and authentication components, refer to the linked best practices guide and the Authentication Components documentation."]]],[]]
