How to implement Websocket using C++?

C The steps to implement Websocket are as follows: Create a server: Use the Boost Asio library to create a server and specify the port number. Handle client connections: Use the WebSocket library to handle client connections and perform Websocket protocol handshakes. Create a client: Use the Autobahn library to create a client and specify the server address.

Implementing Websocket using C

Websocket is a protocol that allows clients and servers to communicate in real time over a full-duplex communication channel Data exchange. It is widely used in scenarios such as instant messaging, multiplayer games, and streaming media. This article will guide you through implementing Websockets in C.

Create Server

1. First, we need to create a server. The following code example uses the Boost Asio library to create a simple Websocket server:

#include <boost/asio.hpp>

using boost::asio::ip::tcp;
using boost::asio::async_write;

class WebsocketServer {
public:
    WebsocketServer(boost::asio::io_service& io_service, int port) :
        acceptor_(io_service, tcp::endpoint(tcp::v4(), port)) {}

    void start() {
        accept();
    }

private:
    void accept() {
        acceptor_.async_accept([this](boost::system::error_code ec, tcp::socket socket) {
            if (!ec) {
                std::cout << "New client connected" << std::endl;
                handle_connection(std::move(socket));
            }
            accept();
        });
    }

    void handle_connection(tcp::socket socket) {
        ... // 处理客户端连接
    }

    tcp::acceptor acceptor_;
};

Handling client connections

2. When handling client connections , we need to perform Websocket protocol handshake. The following code example uses the WebSocket library to handle the handshake:

#include <websocketpp/server.hpp>

using websocketpp::connection_hdl;
using websocketpp::server;

typedef websocketpp::server<websocketpp::config::asio_tls> server_type;

void handle_connection(tcp::socket socket) {
    server_type server;
    connection_hdl connection = server.connect(std::move(socket));
    server.set_message_handler([connection](auto, auto, auto msg) {
        server.send(connection, msg, websocketpp::frame::opcode::text);
    });
    server.run();
}

Create Client

3. Next, we need to create a client. The following code example uses the Autobahn library to create a simple Websocket client:

#include <autobahn/autobahn.hpp>

using autobahn::wsuri;
using autobahn::websocketpp_websocket;

int main() {
    wsuri uri("ws://localhost:8080");
    websocketpp_websocket websocket;
    websocket.start(uri);
    websocket.send("Hello, world!");
    websocket.close();
    return 0;
}

Practical case

4. The following is a complete practical case, Demonstrates the implementation of a simple Websocket server and client:

// 服务端
#include 
#include 
#include 

using boost::asio::ip::tcp;
using websocketpp::connection_hdl;
using websocketpp::server;
using websocketpp::config::asio_no_tls;

typedef server server_type;

int main() {
    boost::asio::io_service io_service;
    server_type server(io_service);

    server.set_open_handler([&server](connection_hdl hdl) {
        std::cout << "New client connected" << std::endl;
    });

    server.set_close_handler([&server](connection_hdl hdl) {
        std::cout << "Client disconnected" << std::endl;
    });

    server.set_message_handler([&server](auto, auto, auto message) {
        server.send(message->get_raw_payload(), message->get_raw_payload_size());
    });

    server.listen(8080);
    server.start_accept();
    io_service.run();
    return 0;
}

// 客户端
#include <autobahn/autobahn.hpp>

using autobahn::wsuri;
using autobahn::websocketpp_websocket;

int main() {
    wsuri uri("ws://localhost:8080");
    websocketpp_websocket websocket;
    websocket.start(uri);
    websocket.send("Hello, world!");
    websocket.close();
    return 0;
}

This practical case demonstrates how to use Boost Asio and WebSocket to create and manage a Websocket server and client.

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