C++ Socket庫與STOMP協議集成

將C++ Socket庫與STOMP協議集成需要以下幾個步驟：

1. 了解STOMP協議：STOMP（Simple Text Oriented Messaging Protocol）是一種簡單的基于文本的消息傳遞協議，用于在客戶端和服務器之間進行消息傳遞。STOMP協議定義了一組命令和響應，用于描述消息的發送、接收和訂閱等操作。

2. 選擇C++ Socket庫：有許多C++ Socket庫可供選擇，如Boost.Asio、Poco和muduo等。這里我們以Boost.Asio為例，介紹如何將C++ Socket庫與STOMP協議集成。

3. 安裝Boost庫：首先需要安裝Boost庫，可以從官方網站（https://www.boost.org/）下載并按照說明進行安裝。

4. 編寫STOMP客戶端：使用Boost.Asio庫編寫一個STOMP客戶端，用于連接到STOMP服務器并發送接收消息。以下是一個簡單的示例：

#include <iostream>
#include <boost/asio.hpp>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>

using namespace boost::asio;
using namespace boost::system;
using namespace std;

class StompClient : public boost::enable_shared_from_this<StompClient> {
public:
    StompClient(io_service& io) : socket_(io) {}

    void connect(const string& host, const string& port) {
        ip::tcp::resolver resolver(socket_.get_executor().context());
        ip::tcp::resolver::query query(host, port);
        ip::tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);

        async_connect(endpoint_iterator,
            boost::bind(&StompClient::handle_connect, shared_from_this(), placeholders::error));
    }

    void send(const string& destination, const string& message) {
        string header = "GET /" + destination + " HTTP/1.1\r\n";
        header += "Host: " + host_ + "\r\n";
        header += "Connection: close\r\n";
        header += "Content-Type: text/plain; charset=utf-8\r\n";
        header += "Accept: text/plain\r\n";
        header += "\r\n";
        header += message;

        async_write(socket_, buffer(header),
            boost::bind(&StompClient::handle_send, shared_from_this(), placeholders::error));
    }

    void subscribe(const string& destination) {
        string header = "SUBSCRIBE /" + destination + " HTTP/1.1\r\n";
        header += "Host: " + host_ + "\r\n";
        header += "Connection: close\r\n";
        header += "\r\n";

        async_write(socket_, buffer(header),
            boost::bind(&StompClient::handle_subscribe, shared_from_this(), placeholders::error));
    }

    void handle_connect(const error_code& error) {
        if (!error) {
            cout << "Connected to STOMP server" << endl;
        } else {
            cout << "Connect failed: " << error.message() << endl;
        }
    }

    void handle_send(const error_code& error) {
        if (!error) {
            cout << "Message sent" << endl;
        } else {
            cout << "Send failed: " << error.message() << endl;
        }
    }

    void handle_subscribe(const error_code& error) {
        if (!error) {
            cout << "Subscribed to destination" << endl;
        } else {
            cout << "Subscribe failed: " << error.message() << endl;
        }
    }

private:
    ip::tcp::socket socket_;
    string host_;
};

int main() {
    io_service io;
    StompClient client(io);
    client.connect("localhost", "61613");
    client.subscribe("/topic/test");

    // Send a message
    client.send("/queue/test", "Hello, STOMP!");

    // Run the io_service to process asynchronous operations
    io.run();

    return 0;
}

5. 編寫STOMP服務器：使用Boost.Asio庫編寫一個STOMP服務器，用于接收客戶端連接并處理消息。以下是一個簡單的示例：

#include <iostream>
#include <boost/asio.hpp>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>

using namespace boost::asio;
using namespace boost::system;
using namespace std;

class StompServer : public boost::enable_shared_from_this<StompServer> {
public:
    StompServer(io_service& io) : acceptor_(io, ip::tcp::endpoint(ip::tcp::v4(), 61613)) {
        start_accept();
    }

    void start_accept() {
        shared_ptr<StompConnection> new_connection(new StompConnection(acceptor_.get_executor().context()));
        acceptor_.async_accept(new_connection->socket_,
            boost::bind(&StompServer::handle_accept, shared_from_this(), new_connection, placeholders::error));
    }

    void handle_accept(shared_ptr<StompConnection> new_connection, const error_code& error) {
        if (!error) {
            cout << "New connection from " << new_connection->socket_.remote_endpoint() << endl;
            new_connection->start();
            start_accept();
        } else {
            cout << "Accept failed: " << error.message() << endl;
        }
    }

private:
    class StompConnection : public boost::enable_shared_from_this<StompConnection> {
    public:
        StompConnection(io_service& io) : socket_(io) {}

        void start() {
            async_read_until(socket_, buffer(data_, max_length), "\n\n",
                boost::bind(&StompConnection::handle_read, shared_from_this(), placeholders::error, placeholders::bytes_transferred));
        }

        void handle_read(const error_code& error, size_t bytes_transferred) {
            if (!error) {
                string response;
                async_write(socket_, buffer(data_, bytes_transferred),
                    boost::bind(&StompConnection::handle_write, shared_from_this(), placeholders::error));
            } else {
                cout << "Read failed: " << error.message() << endl;
            }
        }

        void handle_write(const error_code& error) {
            if (!error) {
                async_read_until(socket_, buffer(data_, max_length), "\n\n",
                    boost::bind(&StompConnection::handle_read, shared_from_this(), placeholders::error, placeholders::bytes_transferred));
            } else {
                cout << "Write failed: " << error.message() << endl;
            }
        }

        ip::tcp::socket& socket_;
        enum { max_length = 1024 };
        char data_[max_length];
    };

    ip::tcp::acceptor acceptor_;
};

int main() {
    io_service io;
    StompServer server(io);

    // Run the io_service to process asynchronous operations
    io.run();

    return 0;
}

6. 編譯和運行：將上述代碼分別保存為客戶端和服務器的源文件，然后使用C++編譯器（如g++）進行編譯。編譯時，需要鏈接Boost.Asio庫。例如：

g++ -o stomp_client stomp_client.cpp -lboost_system
g++ -o stomp_server stomp_server.cpp -lboost_system

然后分別運行客戶端和服務器：

./stomp_client
./stomp_server

現在，你已經成功地將C++ Socket庫與STOMP協議集成，并實現了一個簡單的STOMP客戶端和服務器。你可以根據需要擴展這些示例，以支持更多的STOMP功能，如消息確認、訂閱和取消訂閱等。