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 2025-03-14 UTC."],[[["This page documents the Video Intelligence C++ client library versions, ranging from the latest release candidate 2.37.0-rc down to version 2.11.0, with links to their respective authentication override documentation."],["The client libraries typically use Application Default Credentials for Google Cloud Services authentication, but this default behavior can be overridden if needed."],["The UnifiedCredentialsOption can be used to override the default authentication, allowing for methods like explicitly loading a service account key file."],["The example provided demonstrates loading a service account key file for authentication, and additional information on managing service account keys can be found in the linked best practices guide."],["The Authentication Components documentation provides more information on the factory functions to create `google::cloud::Credentials` objects."]]],[]]
