C++ boost::asio编程-异步TCP详解及实例代码

// BoostTcpServer.cpp : 定义控制台应用程序的入口点。 
// 
 
#include "stdafx.h" 
#include "boost/asio.hpp" 
#include "boost/shared_ptr.hpp" 
#include "boost/thread.hpp" 
 
using namespace std; 
using namespace boost::asio; 
 
#ifdef _MSC_VER 
#define _WIN32_WINNT  0X0501 //避免VC下编译警告 
#endif 
 
#define PORT 1000 
#define IPV6 
//#define IPV4 
 
class AsyncServer 
{ 
public: 
  //构造函数 
  AsyncServer(io_service &io,ip::tcp::endpoint &ep):ios(io),acceptor(io,ep) 
  { 
    //acceptor(ios,ep); 
    start(); 
  } 
  //启动异步接受客户端连接 
  void start() 
  { 
    sock_ptr sock(new ip::tcp::socket(ios)); 
    //当有连接进入时回调accept_handler函数 
    acceptor.async_accept(*sock, 
      boost::bind(&AsyncServer::accept_handler,this,placeholders::error,sock)); 
  } 
private: 
  io_service &ios; 
  ip::tcp::acceptor acceptor; 
  typedef boost::shared_ptr<ip::tcp::socket> sock_ptr; 
 
  void accept_handler(const boost::system::error_code &ec, sock_ptr sock) 
  { 
    if(ec)  
      return; 
    //输出客户端连接信息 
    std::cout <<"remote ip:"<<sock->remote_endpoint().address()<<endl; 
    std::cout <<"remote port:"<<sock->remote_endpoint().port() << std::endl; 
    //异步向客户端发送数据，发送完成时调用write_handler 
    sock->async_write_some(buffer("I heard you!"), 
      bind(&AsyncServer::write_handler,this,placeholders::error)); 
    //再次启动异步接受连接 
    start(); 
  } 
 
  void write_handler(const boost::system::error_code&) 
  { 
    cout<<"send msg complete!"<<endl; 
  } 
}; 
 
int _tmain(int argc, _TCHAR* argv[]) 
{ 
  try 
  { 
    //定义io_service对象 
    io_service ios; 
    //定义服务端endpoint对象(协议和监听端口) 
#ifdef IPV4 
    ip::tcp::endpoint serverep(ip::tcp::v4(),PORT); 
#endif 
 
#ifdef IPV6 
    ip::tcp::endpoint serverep(ip::tcp::v6(),PORT); 
#endif 
    //启动异步服务 
    AsyncServer server(ios, serverep); 
    //等待异步完成 
    ios.run(); 
  } 
  catch (std::exception& e) 
  { 
    cout<<e.what()<<endl; 
  } 
  return 0; 
}