基于事件I/O模型的socket通信

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   WSADATA wsd;//WSADATA变量   SOCKET _socket;   sockaddr_in _addr;    //初始化套结字动态库//创建    if (WSAStartup(MAKEWORD(2,2), &wsd) != 0){WSACleanup();return;}if((_socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET)    {closesocket(_socket);WSACleanup();return;}//服务器地址_addr.sin_family=AF_INET;                    _addr.sin_port=htons(5050);                  //端口_addr.sin_addr.s_addr=INADDR_ANY;             //系统分配ip//绑定if(bind(_socket,(SOCKADDR*)&_addr,sizeof(_addr))==SOCKET_ERROR) {closesocket(_socket);WSACleanup();return;}SOCKET sockets[WSA_MAXIMUM_WAIT_EVENTS];// Maximum number of wait objects 64  WSAEVENT events[WSA_MAXIMUM_WAIT_EVENTS];WSAEVENT newEvent;WSANETWORKEVENTS netWorkEvent;int eventTotal=0;int index;newEvent=WSACreateEvent();WSAEventSelect(_socket,newEvent,FD_ACCEPT|FD_CLOSE);//_socket为自定义的SOCKET,即服务器端的套接字listen(_socket,20);//监听sockets[eventTotal]=_socket;events[eventTotal]=newEvent;++eventTotal;while(true){index=WSAWaitForMultipleEvents(eventTotal,events,false,WSA_INFINITE,false);index-=WSA_WAIT_EVENT_0;//WSA_WAIT_EVENT_0其实是=0的，此处得到的是发生I/O的socket索引WSAEnumNetworkEvents(sockets[index],events[index],&netWorkEvent);if(netWorkEvent.lNetworkEvents&FD_ACCEPT)//新的链接请求{if(netWorkEvent.iErrorCode[FD_ACCEPT_BIT] != 0)std::cout<<"FD_ACCEPT failed with error "<<netWorkEvent.iErrorCode[FD_ACCEPT_BIT]<<"\n";else{sockaddr_in addr;int l=sizeof(sockaddr_in);SOCKET accpetSocket=::accept(_socket,(sockaddr*)&addr,&l);if(eventTotal>=WSA_MAXIMUM_WAIT_EVENTS){std::cout<<"too many connection\n";closesocket(accpetSocket);}else{std::cout<<"new connection at "<<accpetSocket<<"\n";newEvent=WSACreateEvent();WSAEventSelect(accpetSocket,newEvent,FD_READ|FD_CLOSE);//只监听读和关闭事件sockets[eventTotal]=accpetSocket;events[eventTotal]=newEvent;++eventTotal;}}}else if(netWorkEvent.lNetworkEvents&FD_READ)//客户端数据请求{std::cout<<"recv data from index "<<index<<"\n";conduct(sockets[index]);//自定义的处理读取时间的代码，要替换成自己的代码}else if(netWorkEvent.lNetworkEvents&FD_CLOSE)//客户端关闭请求{std::cout<<"close connection from index "<<index<<"\n";//移除关闭的socket<div style="text-indent: 28px;"></div>closesocket(sockets[index]);WSACloseEvent(events[index]); for(int i=index;i<eventTotal-1;++i){sockets[i]=sockets[i+1];events[i]=events[i+1];}--eventTotal;}}
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