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."],[[["The latest release candidate version for the Video Intelligence API is 2.37.0-rc, and the content also provides links to the documentation for previous versions, starting from 2.36.0 and going down to 2.11.0."],["The default authentication method for client libraries is using Application Default Credentials, but this can be overridden using `UnifiedCredentialsOption`."],["Service account key files can be explicitly loaded to override the default authentication, as demonstrated in the provided code example, which uses the `MakeServiceAccountCredentials` function."],["For more information on creating `google::cloud::Credentials` objects, refer to the Authentication Components documentation."],["The example shown in the document outlines one method of overriding authentication, however it is an oversimplified version and the best practices guide is recommended for more details."]]],[]]
