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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::storagecontrol_v2::StorageControlClient( google::cloud::storagecontrol_v2::MakeStorageControlConnection( 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 documents different versions of the Storage Control client library, with version 2.37.0-rc being the latest release candidate."],["The client libraries typically use Application Default Credentials for authentication, but users can override this behavior."],["Overriding authentication can be done by providing the `UnifiedCredentialsOption`, such as loading a service account key file."],["The example code demonstrates how to load a service account key file to override the default credentials, but users should refer to the best practices guide for managing service account keys."],["The Authentication Components page provides more information on creating `google::cloud::Credentials` objects."]]],[]]
