Winsock 网络编程 Socket模型之WSAEventSelect模型

前言：

讲一下套接字模式和套接字I/O模型的区别。先说明一下，只针对Winsock

套接字模式：阻塞套接字和非阻塞套接字。或是叫同步套接字和异步套接字。

套接字模型：描述如何对套接字的I/O行为进行管理

Winsock提供的I/O模式一共有五种：

Select模型，WSAAsyncSelect模型，WSAEventSelect模型，Overlapped模型（重叠IO），Completion模型（完成IO）

三、WSAEventSelect模型

创建监听用Socket     // 载入socket DLL     WSADATA   wdata;     if (WSAStartup(MAKEWORD(2, 2), &wdata) != 0) {                     // 失败     }     // 创建监听m_ListenSocket     m_ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);      if (INVALID_SOCKET == m_ListenSocket) {         // 失败     }     // 启动受信线程     m_ThreadId = 0;      m_Thread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)ReceiveThread, NULL, 0, &m_ThreadId );

受信线程 void ReceiveThread() {     //**************************************************     // 创建Event对象     //**************************************************     // 处理结果     BOOL bResult = TRUE;     // Event对象数     DWORD eventTotal = 0;     // Event对象数组     WSAEVENT eventArray[WSA_MAXIMUM_WAIT_EVENTS];     // socket数组     SOCKET socketArray[WSA_MAXIMUM_WAIT_EVENTS];     // 把监听socket放入socket数组的首位置     socketArray[eventTotal] = m_ListenSocket;     // 创建监听socket用的Event对象、放入Event对象数组的首位置     if ((eventArray[eventTotal] = ::WSACreateEvent()) == WSA_INVALID_EVENT) {              // 失败         bResult = FALSE;     }     if (bResult) {         // 监听用event对象和监听socket绑定：绑定接受，关闭事件         if (SOCKET_ERROR == ::WSAEventSelect(m_ListenSocket,                                             eventArray[eventTotal],                                             FD_ACCEPT|FD_CLOSE) ) {                      // 失败             bResult = FALSE;         } else {             // Event对象数＋１             eventTotal++;         }     }     //**************************************************     // 监听socket绑定     //**************************************************     if (bResult) {         // 绑定         sockaddr_in ser_addr;         ser_addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");            ser_addr.sin_family=AF_INET;            ser_addr.sin_port=htons(50000);          if (SOCKET_ERROR == bind(m_ListenSocket, (LPSOCKADDR)&ser_addr, sizeof(ser_addr))) {             // 失败             bResult = FALSE;         }     }     if (bResult) {                  // 监听开始         if (SOCKET_ERROR == listen(m_ListenSocket, 5)) {             // 失败              bResult = FALSE;         }     }     //**************************************************     // 等待和处理网络事件     //**************************************************     if (bResult) {              DWORD signaledIndex = 0;         SOCKET signaledSocket = INVALID_SOCKET;         WSAEVENT signaledEvent = WSA_INVALID_EVENT;         //**************************************************         // 等待网络事件         //**************************************************         while(TRUE) {            //等待event对象被激发             signaledIndex = ::WSAWaitForMultipleEvents(eventTotal,                                                         eventArray,                                                         FALSE,                                                         INFINITE,                                                         FALSE);             if (WSA_WAIT_FAILED == signaledIndex) {                              // 失败                 break;             }             // 根据被激发的event对象的索引值，取得对应的socket以及event对象             signaledSocket = socketArray[signaledIndex - WSA_WAIT_EVENT_0];             signaledEvent = eventArray[signaledIndex - WSA_WAIT_EVENT_0];             // 枚举网络中、在被激活的socket上、发生的网络事件             WSANETWORKEVENTS netEvents;             if (SOCKET_ERROR == ::WSAEnumNetworkEvents(signaledSocket, signaledEvent, &netEvents)){                                              // 失败                 break;             }             //******************************************************             // FD_ACCEPT事件：网络中有客户端的连接请求             //******************************************************             if (netEvents.lNetworkEvents & FD_ACCEPT) {                              // 网络错误                 if (netEvents.iErrorCode[FD_ACCEPT_BIT] != 0) {                                          // 失败                     break;                 }                 sockaddr_in cli_addr;                 int addrlen = sizeof(cli_addr);                 // 连接                 if ((m_ClientSocket1 = accept(signaledSocket, (sockaddr *)&cli_addr, &addrlen))                     == INVALID_SOCKET) {                                      // 失败                     break;                 }                 // accept函数执行后，也会激活监听用socket的event对象，重置监听用socket的event对象                 WSAResetEvent(signaledEvent);                 // 判断是否超过最大可管理的socket数64                 if (eventTotal > WSA_MAXIMUM_WAIT_EVENTS) {                     // 如果超过64个，关闭该连接，不再接收连接要求                     closesocket(m_ClientSocket1);                     break;                 }                   // 把通信用socket放入socket数组                 socketArray[eventTotal] = m_ClientSocket1;                 // 为该通信用socket，创建event对象，并放入event对象管理数组                 if ((eventArray[eventTotal] = ::WSACreateEvent()) == WSA_INVALID_EVENT) {                     // 失败                                             // 关闭该连接                     closesocket(socketArray[eventTotal]);                     break;                 }                 // event对象邦定：绑定读取，关闭事件                 if (SOCKET_ERROR == ::WSAEventSelect(socketArray[eventTotal],                                                     eventArray[eventTotal],                                                     FD_READ|FD_CLOSE) ) {                                      // 失败                                             // 关闭连接和event对象                     closesocket(socketArray[eventTotal]);                     WSACloseEvent(eventArray[eventTotal]);                     break;                 }                                  // Event对象数＋１                 eventTotal++;             }             //**************************************************             // FD_READ事件：网络中有可读入数据             //**************************************************             if (netEvents.lNetworkEvents & FD_READ) {                 // 网络错误                 if (netEvents.iErrorCode[FD_READ_BIT] != 0) {                                          // 失败                     break;                 }                 char recved[50];                 ZeroMemory(recved, 50);                 int recvedLen = 50;                 char info[50];                 ZeroMemory(info, 50);                 // 接收数据                 recvedLen = recv(signaledSocket, recved, recvedLen, 0);                 if (recvedLen == SOCKET_ERROR || recvedLen == 0) {                     // 失败                     break;                 }             }             //**************************************************             // FD_CLOSE事件：断开连接             //**************************************************             if (netEvents.lNetworkEvents & FD_CLOSE) {                   // 网络错误                 if (netEvents.iErrorCode[FD_CLOSE_BIT] != 0) {                                          // 失败                     break;                 }                // 关闭连接                 closesocket(signaledSocket);                 WSACloseEvent(signaledEvent);                // 把socket和event对象从管理数组中删除                 for (DWORD i = signaledIndex - WSA_WAIT_EVENT_0; i < eventTotal - 1; i++) {                     socketArray[i] = socketArray[i + 1];                     eventArray[i] = eventArray[i + 1];                 }                 // Event对象数-1                 eventTotal--;             }         }     } }