之一 select模型

// select.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <WinSock2.h>
#include <Windows.h>
#include <iostream>
#pragma comment(lib,"ws2_32.lib")

int _tmain(int argc, _TCHAR* argv[])
{
WORD wVersion = MAKEWORD(2,2);
WSADATA wsaData = {0};
if(WSAStartup(wVersion,&wsaData)!=0)
{
printf("Inin WSAStartup Error\r\n");
return -1;
}

SOCKET ListenSocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(ListenSocket==INVALID_SOCKET)
{
WSACleanup();
printf("Create Socket Error\r\n");
return -1;
}
sockaddr_in LocalAddress;
LocalAddress.sin_family = AF_INET;
LocalAddress.sin_port = htons(9627);
LocalAddress.sin_addr.S_un.S_addr = INADDR_ANY;

if(bind(ListenSocket,(sockaddr*)&LocalAddress,sizeof(LocalAddress))==SOCKET_ERROR)
{
closesocket(ListenSocket);
WSACleanup();
printf("Failed bind()\r\n");
return -1;
}
listen(ListenSocket,5);

fd_set fdSocket;
FD_ZERO(&fdSocket);
FD_SET(ListenSocket,&fdSocket);
while(true)
{
fd_set fdRead = fdSocket;
int iPending = select(0,&fdRead,NULL,NULL,NULL);
if(iPending>0)
{
for(int i=0;i<(int)fdSocket.fd_count;i++)
{
if(FD_ISSET(fdSocket.fd_array[i],&fdRead))
{
if(fdSocket.fd_array[i]==ListenSocket) //什么时候不相等，即能跳到下一个else
{
if(fdSocket.fd_count<FD_SETSIZE)
{
sockaddr_in addrRemote;
int nAddrLen = sizeof(addrRemote);
SOCKET sNew = accept(ListenSocket,(sockaddr*)&addrRemote,&nAddrLen);
FD_SET(ListenSocket,&fdSocket);
printf("接收到链接：%s\n",inet_ntoa(addrRemote.sin_addr));
}
else
{
printf("Too much connections!\n");
continue;
}
}
else
{
char szBufferData[0x1000];
int iReturn = recv(fdSocket.fd_array[i],szBufferData,0x1000,0);
if(iReturn > 0)
{
szBufferData[iReturn] = '\0';
printf("接受信息:%s\n", szBufferData);
}
else
{
closesocket(fdSocket.fd_array[i]);
FD_CLR(fdSocket.fd_array[i],&fdSocket);
}
}
}
}
}
}
return 0;
}