boost::asio::ip::tcp实现网络通信的小例子

我稍稍整理了下，就是加了点注释，很基本的东西，大家可以参考socket的几个流程，我上面也有提示的，希望对大家有所帮助。最后，如果大家有什么好的方法希望能让我也分享下，谢谢！

服务端：

#include <boost/asio.hpp>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <iostream>
using boost::asio::ip::tcp;
#define max_len 1024

class clientSession
    :public boost::enable_shared_from_this<clientSession>
{
public:
     clientSession(boost::asio::io_service& ioservice)
        :m_socket(ioservice)
    {
        memset(data_,'\0',sizeof(data_));
    }
    ~clientSession()
    {}
     tcp::socket& socket()
    {
        return m_socket;
    }
    void start()
    {
         boost::asio::async_write(m_socket,
             boost::asio::buffer("link successed!"),
             boost::bind(&clientSession::handle_write,shared_from_this(),
             boost::asio::placeholders::error));

        /*async_read跟客户端一样，还是不能进入handle_read函数,如果你能找到问题所在，请告诉我，谢谢*/

// --已经解决，boost::asio::async_read(...)读取的字节长度不能大于数据流的长度，否则就会进入


// ioservice.run()线程等待，read后面的就不执行了。
        //boost::asio::async_read(m_socket,boost::asio::buffer(data_,max_len),

        //         boost::bind(&clientSession::handle_read,shared_from_this(),

        //         boost::asio::placeholders::error));


        //max_len可以换成较小的数字，就会发现async_read_some可以连续接收未收完的数据

         m_socket.async_read_some(boost::asio::buffer(data_,max_len),
                 boost::bind(&clientSession::handle_read,shared_from_this(),
                 boost::asio::placeholders::error));
    }
private:
    void handle_write(const boost::system::error_code& error)
    {
        
        if(error)
        {
             m_socket.close();
        }
        
    }
    void handle_read(const boost::system::error_code& error)
    {
        
        if(!error)
        {
            std::cout << data_ << std::endl;
            //boost::asio::async_read(m_socket,boost::asio::buffer(data_,max_len),

            //     boost::bind(&clientSession::handle_read,shared_from_this(),

            //     boost::asio::placeholders::error));

             m_socket.async_read_some(boost::asio::buffer(data_,max_len),
                 boost::bind(&clientSession::handle_read,shared_from_this(),
                 boost::asio::placeholders::error));
        }
        else
        {
             m_socket.close();
        }
    
    }
private:
     tcp::socket m_socket;
    char data_[max_len];
};


class serverApp
{
    typedef boost::shared_ptr<clientSession> session_ptr;
public:
     serverApp(boost::asio::io_service& ioservice,tcp::endpoint& endpoint)
        :m_ioservice(ioservice),
         acceptor_(ioservice,endpoint)
    {
         session_ptr new_session(new clientSession(ioservice));
         acceptor_.async_accept(new_session->socket(),
             boost::bind(&serverApp::handle_accept,this,boost::asio::placeholders::error,
             new_session));
    }
    ~serverApp()
    {
    }
private:
    void handle_accept(const boost::system::error_code& error,session_ptr& session)
    {
        if(!error)
        {
            std::cout << "get a new client!" << std::endl;
            //实现对每个客户端的数据处理

             session->start();
            //在这就应该看出为什么要封session类了吧，每一个session就是一个客户端

             session_ptr new_session(new clientSession(m_ioservice));
             acceptor_.async_accept(new_session->socket(),
             boost::bind(&serverApp::handle_accept,this,boost::asio::placeholders::error,
             new_session));
        }
    }
private:
     boost::asio::io_service& m_ioservice;
     tcp::acceptor acceptor_;
};

int main(int argc , char* argv[])
{
     boost::asio::io_service myIoService;
    short port = 8100/*argv[1]*/;
    //我们用的是inet4

     tcp::endpoint endPoint(tcp::v4(),port);
    //终端（可以看作sockaddr_in）完成后，就要accept了

     serverApp sa(myIoService,endPoint);
    //数据收发逻辑

     myIoService.run();
    return 0;
}