WSAEventSelect模型

4步走：

1.//1. 事件句柄和套接字句柄表

2.//2. 创建事件对象，并关联到新的套接字上

3.//3. 在所有事件上等待 //对每个事件调用WSAWaitForMultipleEvents函数，以便确定它的状态

4//获取来到的消息，WSAEnumNetworkEvents会自动重置受信事件

上代码：

#include "InitSock.h"
#include <stdio.h>
int main()
{
	CInitSock initSock;
	//1. 事件句柄和套接字句柄表
	WSAEVENT eventArray[WSA_MAXIMUM_WAIT_EVENTS];
	SOCKET socketArray[WSA_MAXIMUM_WAIT_EVENTS];
	int nEventTotal = 0;


	USHORT nPort = 9999;
	SOCKET sListen = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (INVALID_SOCKET == sListen)
	{
		return -1;
	}
	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)
	{
		return -1;
	}
	::listen(sListen, 5);

	//2. 创建事件对象，并关联到新的套接字上
	WSAEVENT event = ::WSACreateEvent();
	::WSAEventSelect(sListen, event, FD_ACCEPT|FD_CLOSE);

	//添加到列表中
	eventArray[nEventTotal] = event;
	socketArray[nEventTotal] = sListen;
	nEventTotal++;

	//处理网络事件
	while (TRUE)
	{
		//3. 在所有事件上等待
		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
			{
				//获取来到的消息，WSAEnumNetworkEvents会自动重置受信事件
				WSANETWORKEVENTS event;
				::WSAEnumNetworkEvents(socketArray[i], eventArray[i], &event);
				if (event.lNetworkEvents & FD_ACCEPT) //接收到连接
				{
					MessageBox(NULL, "fd_accept", "",MB_OK);
					if (event.iErrorCode[FD_ACCEPT_BIT] == 0) //没出错
					{
						if (nEventTotal > WSA_MAXIMUM_WAIT_EVENTS)
						{
							printf("too many connections...");
						}
						SOCKET sNew = ::accept(socketArray[i], NULL, NULL);
						WSAEVENT event = WSACreateEvent();
						::WSAEventSelect(sNew, event, FD_READ|FD_WRITE|FD_CLOSE);

						//添加到列表
						eventArray[nEventTotal] = event;
						socketArray[nEventTotal] = sNew;
						nEventTotal++;
					}
				}
				else if (event.lNetworkEvents & FD_READ)
				{
					if (event.iErrorCode[FD_READ_BIT] == 0)
					{
						char szContent[512]={0};
						int nRecv= ::recv(socketArray[i], szContent, 512, 0);
						if (nRecv > 0)
						{
							szContent[nRecv] = '\0';
							printf("收到数据 ：%s", szContent);
						}
					}
				}
				else if (event.lNetworkEvents & FD_CLOSE)
				{
					if (event.iErrorCode[FD_CLOSE_BIT] == 0)
					{
						::closesocket(socketArray[i]);
						for (int j=i;j<nEventTotal-1;j++)
						{
							socketArray[j] = socketArray[j+1];
							eventArray[j] = eventArray[j+1];
						}
						nEventTotal--;
					}
				}
				else if (event.lNetworkEvents & FD_WRITE)
				{
					char szContent[] = "server writed";
					::send(socketArray[i], szContent, sizeof(szContent), 0);
				}
			}
		}
	}
	return 0;
}