windows socket网络编程--事件选择模型( 二 ) _生活百科

int WSAAPI WSAEnumNetworkEvents( SOCKET s, //标识套接字 WSAEVENT hEventObject, //用于标识要重置的关联事件对象的可选句柄 LPWSANETWORKEVENTS lpNetworkEvents //指向 WSANETWORKEVENTS 结构的指针，该结构填充了发生的网络事件记录和任何关联的错误代码);返回值如果操作成功，则返回值为零。否则，返回值SOCKET_ERROR作用枚举出与事件对象相关联的套接字发生了哪些信号，结果放在WSANETWORKEVENTS结构体中
工作原理流程大致是这样：

定义一个socket数组和event数组
每一个socket操作关联一个event对象
调用WSAWaitForMultipleEvents函数等待事件的触发
调用WSAEnumNetworkEvents函数查看是哪个一个事件，根据事件找到相应的socket ，然后进行相应的处理：比如数据显示等，同时，记得要将那个event重置为无信号状态。
循环步骤3和4 ，直到服务器退出。流程图

文章插图

代码实现服务端
UINT CMFCWSAEventDlg::ThreadProc(LPVOID lparam) { // TODO: 在此添加控件通知处理程序代码 CMFCWSAEventDlg* p = (CMFCWSAEventDlg*)lparam; SocketInit socketInit; SOCKET socketServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (socketServer == INVALID_SOCKET) {AfxMessageBox(_T("套接字创建失败"));closesocket(socketServer);WSACleanup(); } sockaddr_in sock; sock.sin_family = AF_INET; sock.sin_port = htons(5678); sock.sin_addr.S_un.S_addr = INADDR_ANY; int n = sizeof(sock); if (bind(socketServer, (sockaddr*)&sock, sizeof(sock)) == SOCKET_ERROR) {AfxMessageBox(_T("监听失败"));closesocket(socketServer);WSACleanup(); } if (listen(socketServer, SOMAXCONN) == SOCKET_ERROR) {AfxMessageBox(_T("监听失败"));closesocket(socketServer);WSACleanup(); } p->showText.SetWindowText("开始监听\r\n"); // 创建事件对象，并关联到新的套节字 WSAEVENT event = ::WSACreateEvent(); ::WSAEventSelect(socketServer, event, FD_ACCEPT | FD_CLOSE); // 添加到表中 p->eventArray[p->nEventTotal] = event; p->sockArray[p->nEventTotal] = socketServer; p->nEventTotal++; CString str; sockaddr_in addrRemote; while (1){// 在所有事件对象上等待int nIndex = ::WSAWaitForMultipleEvents(p->nEventTotal, p->eventArray, FALSE, WSA_INFINITE, FALSE);// 对每个事件调用WSAWaitForMultipleEvents函数，以便确定它的状态nIndex = nIndex - WSA_WAIT_EVENT_0;for (int i = nIndex; i < p->nEventTotal; i++){nIndex = ::WSAWaitForMultipleEvents(1, &p->eventArray[i], TRUE, 1000, FALSE);if (nIndex == WSA_WAIT_FAILED || nIndex == WSA_WAIT_TIMEOUT){continue;}else{// 获取到来的通知消息， WSAEnumNetworkEvents函数会自动重置受信事件WSANETWORKEVENTS event;::WSAEnumNetworkEvents(p->sockArray[i], p->eventArray[i], &event);if (event.lNetworkEvents & FD_ACCEPT) // 处理FD_ACCEPT通知消息{if (event.iErrorCode[FD_ACCEPT_BIT] == 0){if (p->nEventTotal > WSA_MAXIMUM_WAIT_EVENTS){p->showText.SetSel(-1);p->showText.ReplaceSel("时间太长");continue;}int nAddrLen = sizeof(addrRemote);SOCKET sNew = ::accept(p->sockArray[i], (SOCKADDR*)&addrRemote, &nAddrLen);//MessageBox("已连接");int nLen = p->showText.GetWindowTextLengthA();//p->showText.SetWindowText()str.Format("%s建立连接\r\n", ::inet_ntoa(addrRemote.sin_addr));p->showText.SetSel(-1);p->showText.ReplaceSel(str);WSAEVENT event = ::WSACreateEvent();::WSAEventSelect(sNew, event, FD_READ | FD_CLOSE | FD_WRITE);// 添加到表中p->eventArray[p->nEventTotal] = event;p->sockArray[p->nEventTotal] = sNew;p->nEventTotal++;}}else if (event.lNetworkEvents & FD_READ) // 处理FD_READ通知消息{if (event.iErrorCode[FD_READ_BIT] == 0){//char szText[256];char szText[1024] = { 0 };//memset(szText, 0, sizeof(szText));int nlen = strlen(szText);int nRecv = ::recv(p->sockArray[i], szText,1024, 0);//AfxMessageBox(nRecv);if (nRecv > 0){szText[nRecv] = '\0';str.Format("%s发来了一条消息:%s\r\n", ::inet_ntoa(addrRemote.sin_addr), szText);p->showText.SetSel(-1);p->showText.ReplaceSel(str);//szText[0] = '\0';// 向客户端发送数据char *sendText = getallprime(1000);if (::send(p->sockArray[i], sendText, strlen(sendText), 0) > 0){p->showText.SetSel(-1);p->showText.ReplaceSel("已发送结果\r\n");}}}}else if (event.lNetworkEvents & FD_CLOSE) // 处理FD_CLOSE通知消息{if (event.iErrorCode[FD_CLOSE_BIT] == 0){::closesocket(p->sockArray[i]);for (int j = i; j < p->nEventTotal - 1; j++){p->eventArray[j] = p->eventArray[j + 1];p->sockArray[j] = p->sockArray[j + 1];}p->nEventTotal--;}p->showText.SetSel(-1);p->showText.ReplaceSel("关闭连接\r\n");}}} }}