C++03:使用Boost－用Asio實現簡易Echo Server

C++03:使用Boost－用Asio實現簡易Echo Server

C++03:使用Boost－用Asio實現簡易Echo Server 

2009-10-29 11:27 一、編寫代碼

註：以下代碼取自boost 1.40的範例程式碼：

//// async_tcp_echo_server.cpp// ~~~~~~~~~~~~~~~~~~~~~~~~~//// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)//// Distributed under the Boost Software License, Version 1.0. (See accompanying// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)//#include <cstdlib>#include <iostream>#include <boost/bind.hpp>#include <boost/asio.hpp>using boost::asio::ip::tcp;class session {public:    session(boost::asio::io_service& io_service) :        socket_(io_service) {    }    tcp::socket& socket() {        return socket_;    }    void start() {        socket_.async_read_some(boost::asio::buffer(data_, max_length),                boost::bind(&session::handle_read, this,                        boost::asio::placeholders::error,                        boost::asio::placeholders::bytes_transferred));    }    void handle_read(const boost::system::error_code& error,            size_t bytes_transferred) {        if (!error) {            boost::asio::async_write(socket_, boost::asio::buffer(data_,                    bytes_transferred), boost::bind(&session::handle_write,                    this, boost::asio::placeholders::error));        } else {            delete this;        }    }    void handle_write(const boost::system::error_code& error) {        if (!error) {            socket_.async_read_some(boost::asio::buffer(data_, max_length),                    boost::bind(&session::handle_read, this,                            boost::asio::placeholders::error,                            boost::asio::placeholders::bytes_transferred));        } else {            delete this;        }    }private:    tcp::socket socket_;    enum {        max_length = 1024    };    char data_[max_length];};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* 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* new_session,            const boost::system::error_code& error) {        if (!error) {            new_session->start();            new_session = new session(io_service_);            acceptor_.async_accept(new_session->socket(), boost::bind(                    &server::handle_accept, this, new_session,                    boost::asio::placeholders::error));        } else {            delete new_session;        }    }private:    boost::asio::io_service& io_service_;    tcp::acceptor acceptor_;};int main(int argc, char* argv[]) {    try {        if (argc != 2) {            std::cerr << "Usage: async_tcp_echo_server <port>\n";            return 1;        }        boost::asio::io_service io_service;        using namespace std;        // For atoi.        server s(io_service, atoi(argv[1]));        io_service.run();    } catch (std::exception& e) {        std::cerr << "Exception: " << e.what() << "\n";    }    return 0;}

二、編譯代碼

$ g++ －g3 －Wall -o"async_tcp_echo_server" async_tcp_echo_server.cpp -lboost_system

注意：boost.asio庫依賴boost_system

三、運行 async_tcp_echo_server

$ ./async_tcp_echo_server 8868   # 8868 是async_tcp_echo_server listen的連接埠號碼

四、用 telnet 命令作為用戶端測試

新開啟一個終端，注意：同樣要登入到Linux實驗室，執行： telnet localhost 8868

$ telnet localhost 8868Trying ::1...Trying 127.0.0.1...Connected to localhost.Escape character is '^]'.the first line    # 這是我們的輸入the first line    # 這是伺服器 async_tcp_echo_server 的回應，以下類推the second linethe second linewelcome to xuanyuan-soft.org.cn!welcome to xuanyuan-soft.org.cn!

五、關於Boost更多的資訊

請訪問Boost的首頁：http://www.boost.org/