c++中实现websocket客户端和服务端

在C++中实现WebSocket客户端和服务端，通常需要使用第三方库来简化操作。以下是使用两个流行的C++ WebSocket库的示例代码：

1. 使用Boost.Beast库实现WebSocket客户端和服务端：

WebSocket客户端：

#include <boost/beast/core.hpp>
#include <boost/beast/websocket.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <iostream>

namespace beast = boost::beast; 
namespace http = beast::http; 
namespace websocket = beast::websocket; 
namespace net = boost::asio; 
using tcp = boost::asio::ip::tcp;

int main(int argc, char** argv) {
    net::io_context ioc;

    tcp::resolver resolver(ioc);
    websocket::stream<tcp::socket> ws(ioc);

    auto const results = resolver.resolve("echo.websocket.org", "80");
    boost::asio::connect(ws.next_layer(), results.begin(), results.end());

    ws.handshake("echo.websocket.org", "/");
    ws.write(net::buffer(std::string("Hello, world!")));

    beast::flat_buffer buffer;
    ws.read(buffer);
    std::cout << beast::make_printable(buffer.data()) << std::endl;

    ws.close(websocket::close_code::normal);
}

WebSocket服务端：

#include <boost/beast/core.hpp>
#include <boost/beast/websocket.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <iostream>

namespace beast = boost::beast; 
namespace http = beast::http; 
namespace websocket = beast::websocket; 
namespace net = boost::asio; 
using tcp = boost::asio::ip::tcp;

int main(int argc, char** argv) {
    net::io_context ioc;
    tcp::acceptor acceptor(ioc, tcp::endpoint(tcp::v4(), 8080));

    while (true) {
        tcp::socket socket(ioc);
        acceptor.accept(socket);

        try {
            websocket::stream<tcp::socket> ws(std::move(socket));
            ws.accept();

            beast::flat_buffer buffer;
            ws.read(buffer);

            ws.text(ws.got_text());
            ws.write(buffer.data());
        } catch (const std::exception& e) {
            std::cerr << "Error: " << e.what() << std::endl;
        }
    }
}

2. 使用Simple-Websocket-Server库实现WebSocket客户端和服务端：

WebSocket客户端：

#include "websocket.h"

int main(int argc, char** argv) {
    auto client = std::make_shared<SimpleWeb::SocketClient<SimpleWeb::WS>>();
    client->on_open = [](std::shared_ptr<SimpleWeb::SocketClient<SimpleWeb::WS>> client) {
        std::cout << "Connected to server!" << std::endl;
        client->send("Hello, world!");
    };
    client->on_message = [](std::shared_ptr<SimpleWeb::SocketClient<SimpleWeb::WS>> client, std::shared_ptr<SimpleWeb::WS::Message> message) {
        std::cout << "Received message: " << message->string() << std::endl;
        client->close();
    };
    client->connect("echo.websocket.org", 80);
}

WebSocket服务端：

#include "websocket.h"

int main(int argc, char** argv) {
    auto server = std::make_shared<SimpleWeb::SocketServer<SimpleWeb::WS>>();
    server->on_message = [](std::shared_ptr<SimpleWeb::SocketServer<SimpleWeb::WS>::Connection> connection, std::shared_ptr<SimpleWeb::WS::Message> message) {
        std::cout << "Received message: " << message->string() << std::endl;
        connection->send(message->string());
    };
    server->start();
}

请注意，这只是WebSocket客户端和服务端实现的基本示例。使用时需要根据实际需求进行修改和扩展。