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::containeranalysis_v1::ContainerAnalysisClient(
google::cloud::containeranalysis_v1::MakeContainerAnalysisConnection(
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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis document provides a version history for the Container Analysis C++ client library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe primary focus of the document is on how to override the default authentication credentials when using the Container Analysis client libraries in C++, detailing the process of loading a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eThe example code demonstrates how to explicitly set authentication by utilizing the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e and \u003ccode\u003eMakeServiceAccountCredentials\u003c/code\u003e functions, offering a way to specify service account credentials directly.\u003c/p\u003e\n"],["\u003cp\u003eLinks are provided to examples for both \u003ccode\u003eContainerAnalysisClient\u003c/code\u003e and \u003ccode\u003eGrafeasClient\u003c/code\u003e classes, showcasing how to implement service account authentication within each, alongside a link to best practices for managing service account keys.\u003c/p\u003e\n"],["\u003cp\u003eThe document directs the user to the Authentication Components page, in order to provide further details on the creation of Credentials objects.\u003c/p\u003e\n"]]],[],null,[]]
