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C++ Client Libraries | Google Cloud

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Document AI Warehouse API C++ Client Library

An idiomatic C++ client library for the Document AI Warehouse API, an integrated, cloud-based platform to store, search, organize, govern and analyze documents and their structured metadata.

While this library is GA, please note that the Google Cloud C++ client libraries do not follow Semantic Versioning.

Quickstart

The following shows the code that you'll run in the google/cloud/contentwarehouse/quickstart/ directory, which should give you a taste of the Document AI Warehouse API C++ client library API.

#include "google/cloud/contentwarehouse/v1/document_client.h"
#include <iostream>

int main(int argc, char* argv[]) try {
  if (argc != 3) {
    std::cerr << "Usage: " << argv[0] << " project-number location-id\n";
    return 1;
  }

  namespace contentwarehouse = ::google::cloud::contentwarehouse_v1;
  auto client = contentwarehouse::DocumentServiceClient(
      contentwarehouse::MakeDocumentServiceConnection());

  auto const parent =
      std::string{"projects/"} + argv[1] + "/locations/" + argv[2];
  for (auto r : client.SearchDocuments(parent)) {
    if (!r) throw std::move(r).status();
    std::cout << r->DebugString() << "\n";
  }

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

Main classes

This library offers multiple *Client classes, which are listed below. Each one of these classes exposes all the RPCs for a gRPC service as member functions of the class. This library groups multiple gRPC services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.

The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.

Retry, Backoff, and Idempotency Policies.

The library automatically retries requests that fail with transient errors, and uses exponential backoff to backoff between retries. Application developers can override the default policies.

More Information

Error Handling - describes how the library reports errors.
How to Override the Default Endpoint - describes how to override the default endpoint.
How to Override the Authentication Credentials - describes how to change the authentication credentials used by the library.
Environment Variables - describes environment variables that can configure the behavior of the library.

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 webpage details the C++ client library for the Document AI Warehouse API, a platform for managing and analyzing documents and their metadata."],["The latest version of the client library is 2.37.0-rc, with multiple previous versions available, ranging from 2.36.0 down to 2.12.0."],["The Document AI Warehouse API C++ client library is generally available (GA) but does not follow semantic versioning."],["The library provides several `*Client` classes, including `DocumentServiceClient`, `DocumentLinkServiceClient`, `DocumentSchemaServiceClient`, `RuleSetServiceClient`, and `SynonymSetServiceClient`, each managing related gRPC services."],["The library has automatic retry capabilities with exponential backoff, and its behavior is customizable via error handling, endpoint override, authentication override, and environment variables."]]],[]]

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