WSAEventSelect模型

 

 

//The WSACreateEvent function creates a new event object.
WSAEVENT WSACreateEvent(void);

//The WSAEventSelect function specifies an event object to be associated with the specified set of FD_XXX network events.
int WSAEventSelect(
  __in          SOCKET s,
  __in          WSAEVENT hEventObject,
  __in          long lNetworkEvents
);

//The WSAWaitForMultipleEvents function returns when one or all of the specified event objects are in the signaled state, when the time-out interval expires, or when an I/O completion routine has executed.
DWORD WSAWaitForMultipleEvents(
  __in          DWORD cEvents,
  __in          const WSAEVENT* lphEvents,
  __in          BOOL fWaitAll,
  __in          DWORD dwTimeout,
  __in          BOOL fAlertable
);

//The WSAEnumNetworkEvents function discovers occurrences of network events for the indicated socket, clear internal network event records, and reset event objects (optional).
int WSAEnumNetworkEvents(
  __in          SOCKET s,
  __in          WSAEVENT hEventObject,
  __out         LPWSANETWORKEVENTS lpNetworkEvents
);

 

 

 

//////////////////////////////////////////////////
// WSAEventSelect文件

#include "WSAInit.h"
#include <stdio.h>
#include <iostream>
#include <windows.h>

// 初始化Winsock库
CWSAInit theSock;

int main()
{
    // 事件句柄和套节字句柄表
    WSAEVENT    eventArray[WSA_MAXIMUM_WAIT_EVENTS];
    SOCKET        sockArray[WSA_MAXIMUM_WAIT_EVENTS];
    int nEventTotal = 0;

    USHORT nPort = 4567;    // 此服务器监听的端口号

    // 创建监听套节字
    SOCKET sListen = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);    
    sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(nPort);
    sin.sin_addr.S_un.S_addr = INADDR_ANY;
    if(::bind(sListen, (sockaddr*)&sin, sizeof(sin)) == SOCKET_ERROR)
    {
        printf(" Failed bind() \n");
        return -1;
    }
    ::listen(sListen, 5);

    // 创建事件对象，并关联到新的套节字
    WSAEVENT event = ::WSACreateEvent();
    ::WSAEventSelect(sListen, event, FD_ACCEPT|FD_CLOSE);
    // 添加到表中
    eventArray[nEventTotal] = event;
    sockArray[nEventTotal] = sListen;    
    nEventTotal++;

    // 处理网络事件
    while(TRUE)
    {
        // 在所有事件对象上等待
        int nIndex = ::WSAWaitForMultipleEvents(nEventTotal, 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<nEventTotal; i++)
        {
            nIndex = ::WSAWaitForMultipleEvents(1, &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(sockArray[i], eventArray[i], &event);
                if(event.lNetworkEvents & FD_ACCEPT)                // 处理FD_ACCEPT通知消息
                {
                    if(event.iErrorCode[FD_ACCEPT_BIT] == 0)
                    {
                        if(nEventTotal > WSA_MAXIMUM_WAIT_EVENTS)
                        {
                            printf(" Too many connections! \n");
                            continue;
                        }
                        SOCKET sNew = ::accept(sockArray[i], NULL, NULL);
                        WSAEVENT event = ::WSACreateEvent();
                        ::WSAEventSelect(sNew, event, FD_READ|FD_CLOSE|FD_WRITE);
                        // 添加到表中
                        eventArray[nEventTotal] = event;
                        sockArray[nEventTotal] = sNew;    
                        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];
                        int nRecv = ::recv(sockArray[i], szText, 256, 0);
                        if(nRecv > 0)                
                        {
                            szText[nRecv] = 0;
                            printf("接收到数据：%s \n", szText);
                        }
                    }
                }
                else if(event.lNetworkEvents & FD_CLOSE)        // 处理FD_CLOSE通知消息
                {
                    if(event.iErrorCode[FD_CLOSE_BIT] == 0)
                    {
                        ::closesocket(sockArray[i]);
                        for(int j=i; j<nEventTotal-1; j++)
                        {
                            eventArray[j] = eventArray[j+1];
                            sockArray[j] = sockArray[j+1];    
                        }
                        nEventTotal--;
                        i--;
                    }
                }
                else if(event.lNetworkEvents & FD_WRITE)        // 处理FD_WRITE通知消息
                {
                }
            }
        }
    }
    return 0;
}