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; }