boost::asio::buffers

最新推荐文章于 2024-03-26 17:24:37 发布

独立月下寒

最新推荐文章于 2024-03-26 17:24:37 发布

阅读量1.1k

点赞数

分类专栏： boost

boost 专栏收录该内容

3 篇文章

订阅专栏

本文介绍了一个使用Boost.Asio库实现的简单网络服务器示例。该服务器监听6001端口，并向客户端发送当前时间。示例中包含了自定义缓冲区类shared_const_buffer的实现，以及会话类session和服务器类server的具体功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

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

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

// A reference-counted non-modifiable buffer class.
class shared_const_buffer
{
    public:
    // Construct from a std::string.
    explicit shared_const_buffer(const std::string& data)
    : data_(new std::vector<char>(data.begin(), data.end())),
    buffer_(boost::asio::buffer(*data_))
    {
    }

    // Implement the ConstBufferSequence requirements.
    typedef boost::asio::const_buffer value_type;
    typedef const boost::asio::const_buffer* const_iterator;
    const boost::asio::const_buffer* begin() const { return &buffer_; }
    const boost::asio::const_buffer* end() const { return &buffer_ + 1; }

    private:
        boost::shared_ptr<std::vector<char> > data_;
        boost::asio::const_buffer buffer_;
};


class session
: public boost::enable_shared_from_this<session>
{
    public:
    session(boost::asio::io_service& io_service)
        : socket_(io_service)
    {
    }

    tcp::socket& socket()
    {
        return socket_;
    }

    void start()
    {
        using namespace std; // For time_t, time and ctime.
        time_t now = time(0);
        shared_const_buffer buffer(ctime(&now));
        boost::asio::async_write(socket_, buffer,
        boost::bind(&session::handle_write, shared_from_this()));
    }
    void handle_write()
    {
    }
    private:
        // The socket used to communicate with the client.
        tcp::socket socket_;
};

typedef boost::shared_ptr<session> session_ptr;
class server
{
public:
    server(boost::asio::io_service& io_service, short port)
    : io_service_(io_service),
    acceptor_(io_service, tcp::endpoint(tcp::v4(), port))
    {
        session_ptr new_session(new session(io_service_));
        acceptor_.async_accept(new_session->socket(),
        boost::bind(&server::handle_accept, this, new_session,
        boost::asio::placeholders::error));
    }

    void handle_accept(session_ptr new_session,const boost::system::error_code& error)
    {
        if (!error)
        {
            new_session->start();
        }
        new_session.reset(new session(io_service_));
        acceptor_.async_accept(new_session->socket(),
        boost::bind(&server::handle_accept, this, new_session,boost::asio::placeholders::error));
    }
    private:
    boost::asio::io_service& io_service_;
    tcp::acceptor acceptor_;
};


int main(int argc, char* argv[])
{
    try
    {
        boost::asio::io_service io_service;
        using namespace std; // For atoi.
        server s(io_service, 6001);
        io_service.run();
    }
    catch (std::exception& e)
    {
        std::cerr << "Exception: " << e.what() << "\n";
    }
    return 0;
}