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Showing content from https://cloud.google.com/cpp/docs/reference/dlp/2.11.0/dlp-override-authentication below:

C++ Client Libraries | Google Cloud

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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::dlp_v2::DlpServiceClient(
        google::cloud::dlp_v2::MakeDlpServiceConnection(options));
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.

Authentication Components - for more information on the factory functions to create google::cloud::Credentials objects.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["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 2025-08-14 UTC."],[[["This page provides documentation for various versions of the C++ DLP (Data Loss Prevention) library, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The primary focus of the documentation is on how to override the default authentication credentials used by the C++ client libraries to interact with Google Cloud Services."],["By using the `UnifiedCredentialsOption`, developers can load credentials from a service account key file, which is demonstrated through a code example."],["The page links to further resources on managing service account keys and detailed information on authentication components for creating credentials objects."],["The default method of authenticating with google cloud services is by utilizing the [Application Default Credentials](https://cloud.google.com/docs/authentication#adc), but can be overriden."]]],[]]

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