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::videointelligence_v1::VideoIntelligenceServiceClient(
google::cloud::videointelligence_v1::
MakeVideoIntelligenceServiceConnection(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 2025-04-09 UTC."],[[["This page details how to override the default authentication credentials for Google Cloud Services, which typically use Application Default Credentials."],["The latest release candidate version is 2.37.0-rc, with the list showing a history of previous versions down to 2.11.0, and version 2.30.0 being the version this documentation is for."],["You can override the default credentials by using the `UnifiedCredentialsOption` and loading a service account key file, as demonstrated in the provided code example."],["For detailed guidance on managing service account keys, refer to the \"Best practices for managing service account keys\" guide."],["Additional information on creating `google::cloud::Credentials` objects can be found in the \"Authentication Components\" documentation."]]],[]]
