c++ websocket

要在 C++ 中实现 WebSocket，您可以使用现有的 WebSocket 库，如 Boost.Beast 或 uWebSockets。这些库提供了 WebSocket 协议的实现，并允许您创建 WebSocket 客户端和服务器。

以下是使用 Boost.Beast 创建 WebSocket 客户端的示例代码：

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

namespace beast = boost::beast; // from <boost/beast.hpp>
namespace http = beast::http;   // from <boost/beast/http.hpp>
namespace websocket = beast::websocket; // from <boost/beast/websocket.hpp>
namespace net = boost::asio;    // from <boost/asio.hpp>
using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>

int main(int argc, char** argv)
{
    try
    {
        // Check command line arguments.
        if (argc != 4)
        {
            std::cerr <<
                "Usage: websocket-client-sync <host> <port> <text>\n" <<
                "Example:\n" <<
                "    websocket-client-sync echo.websocket.org 80 \"Hello, world!\"\n";
            return EXIT_FAILURE;
        }
        auto const host = argv[1];
        auto const port = argv[2];
        auto const text = argv[3];

        // The io_context is required for all I/O
        net::io_context ioc;

        // These objects perform our I/O
        tcp::resolver resolver{ioc};
        websocket::stream<tcp::socket> ws{ioc};

        // Look up the domain name
        auto const results = resolver.resolve(host, port);

        // Make the connection on the IP address we get from a lookup
        auto ep = net::connect(ws.next_layer(), results);

        // Set up the WebSocket handshake
        ws.handshake(host, "/", beast::multi_buffer());

        // Send the message
        ws.write(net::buffer(std::string{text}));

        // This buffer will hold the incoming message
        beast::flat_buffer buffer;

        // Read a message into our buffer
        ws.read(buffer);

        // Close the WebSocket connection
        ws.close(websocket::close_code::normal);

        // If we get here then the connection is closed gracefully

        // The buffers() function helps print a ConstBufferSequence
        std::cout << beast::buffers(buffer.data()) << std::endl;

        // Exit with success
        return EXIT_SUCCESS;
    }
    catch (std::exception const& e)
    {
        std::cerr << "Error: " << e.what() << std::endl;
        return EXIT_FAILURE;
    }
}

该示例使用 Boost.Beast 创建 WebSocket 客户端，连接到指定的 WebSocket 服务器并发送一条消息。接收到服务器的响应后，关闭 WebSocket 连接并打印出响应消息。