asio tcp client and server implement

asio tcp client and server implement

tcp server

#include <cstdlib>
#include <iostream>
#include <thread>
#include <utility>
#include "asio.hpp"

using asio::ip::tcp;

const int max_length = 1024;

void session(tcp::socket sock)
{
    try
    {
        for (;;)
        {
            char data[max_length];

            asio::error_code error;
            size_t length = sock.read_some(asio::buffer(data), error);
            if (error == asio::error::eof)
                break; // Connection closed cleanly by peer.
            else if (error)
                throw asio::system_error(error); // Some other error.

            char data_print[max_length];
            strncpy(data_print, data, length);
            data_print[length] = '';
            std::cout<<data_print<<std::endl;
            asio::write(sock, asio::buffer(data, length));
        }
    }
    catch (std::exception& e)
    {
        std::cerr << "Exception in thread: " << e.what() << "
";
    }
}

void server(asio::io_context& io_context, unsigned short port)
{
    tcp::acceptor a(io_context, tcp::endpoint(tcp::v4(), port));
    for (;;)
    {
        std::thread(session, a.accept()).detach();
    }
}

int main(int argc, char* argv[])
{
    try
    {
        if (argc != 2)
        {
            std::cerr << "Usage: blocking_tcp_echo_server <port>
";
            return 1;
        }

        asio::io_context io_context;

        server(io_context, std::atoi(argv[1]));
    }
    catch (std::exception& e)
    {
        std::cerr << "Exception: " << e.what() << "
";
    }

    return 0;
}

tcp client

#include <cstdlib>
#include <cstring>
#include <iostream>
#include "asio.hpp"

using 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>
";
            return 1;
        }

        asio::io_context io_context;

        tcp::socket s(io_context);
        tcp::resolver resolver(io_context);
        asio::connect(s, resolver.resolve(argv[1], argv[2]));

        std::cout << "Enter message: ";
        char request[max_length];
        std::cin.getline(request, max_length);
        size_t request_length = std::strlen(request);
        asio::write(s, asio::buffer(request, request_length));

        char reply[max_length];
        size_t reply_length = asio::read(s, asio::buffer(reply, request_length));
        std::cout << "Reply is: ";
        std::cout.write(reply, reply_length);
        std::cout << "
";
    }
    catch (std::exception& e)
    {
        std::cerr << "Exception: " << e.what() << "
";
    }

    return 0;
}