BOOST-ASIO阻塞服务器不响应阻塞客户端

我最近为有问题的服务器解决了这个问题，但事实证明服务器似乎没有回复客户端，甚至没有接收任何发送的数据。这是我在客户端所做的。

C:blocking_tcp_echo_clientbinDebug>blocking_tcp_echo_client 127.0.0.1 4001
Enter message: hello
Exception: read: End of file

这是服务器端。我确实在启动客户机之前启动了服务器。我还用原始代码测试了客户端，它工作得很好。

C:boost_server_classbinDebug>boost_server_class
TCPIP_server:
Usage: blocking_tcp_echo_server

blocking_tcp_echo_client.cpp

#include <cstdlib>
#include <cstring>
#include <iostream>
#include <boost/asio.hpp>
using boost::asio::ip::tcp;
enum { max_length = 1024 };
int main(int argc, char* argv[])
{
  try
  {
    if (argc != 3)
    {
      std::cerr << "Usage: blocking_tcp_echo_client <host> <port>n";
      return 1;
    }
    boost::asio::io_service io_service;
    tcp::resolver resolver(io_service);
    tcp::resolver::query query(tcp::v4(), argv[1], argv[2]);
    tcp::resolver::iterator iterator = resolver.resolve(query);
    tcp::socket s(io_service);
    s.connect(*iterator);
    using namespace std; // For strlen.
    std::cout << "Enter message: ";
    char request[max_length];
    std::cin.getline(request, max_length);
    size_t request_length = strlen(request);
    boost::asio::write(s, boost::asio::buffer(request, request_length));
    char reply[max_length];
    size_t reply_length = boost::asio::read(s,
        boost::asio::buffer(reply, request_length));
    std::cout << "Reply is: ";
    std::cout.write(reply, reply_length);
    std::cout << "n";
  }
  catch (std::exception& e)
  {
    std::cerr << "Exception: " << e.what() << "n";
  }
  return 0;
}

boostrongerver_class.cpp

#include "TCPIP_server.h"
#include <iostream>
int main()
{
    std::cout<<"TCPIP_server:"<<std::endl;
    TCPIP_server server;
    server.main_server();
    return 0;
}

TCPIP_server.h

#include <boost/thread/thread.hpp>
#include <boost/bind.hpp>
#include <boost/smart_ptr.hpp>
#include <boost/asio.hpp>
#include <cstdlib>
#include <iostream>
using boost::asio::ip::tcp;
const int max_length = 1024;
class TCPIP_server
{
        private:
            typedef boost::shared_ptr<tcp::socket> socket_ptr;
            char data[max_length];
        public:
        TCPIP_server(){}
        ~TCPIP_server(){}
        void session(socket_ptr sock)
        {
            std::cout<<"TCPIP_server session:"<<std::endl;
            try
            {
                for (;;)
                {
                    char data[max_length];
                    boost::system::error_code error;
                    size_t length = sock->read_some(boost::asio::buffer(data), error);
                    if (error == boost::asio::error::eof)
                        break; // Connection closed cleanly by peer.
                    else if (error)
                        throw boost::system::system_error(error); // Some other error.
                    boost::asio::write(*sock, boost::asio::buffer(data, length));
                }
            }
            catch (std::exception& e)
            {
                std::cerr << "Exception in thread: " << e.what() << "n";
            }
        }
        void server(boost::asio::io_service& io_service, short port)
        {
            tcp::acceptor a(io_service, tcp::endpoint(tcp::v4(), port));
            for (;;)
            {
                socket_ptr sock(new tcp::socket(io_service));
                a.accept(*sock);
                boost::bind(&TCPIP_server::session, this, sock);
            }
        }
        void main_server()
        {
            try
            {
                std::cerr << "Usage: blocking_tcp_echo_server n";
                boost::asio::io_service io_service;
                using namespace std; // For atoi.
                server(io_service, atoi("4001"));
            }
            catch (std::exception& e)
            {
                std::cerr << "Exception: " << e.what() << "n";
            }
        }
};