B.7基于套接口复用的聊天室系统

//服务器
#pragma comment(lib, "ws2_32.lib")
#include <winsock2.h>
#include <stdio.h>
int main()
{
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2,2),&wsaData)!=0) 
{
   return -1;
}
SOCKET ListenSocket;
ListenSocket = socket(AF_INET,SOCK_STREAM,0);
if (ListenSocket == INVALID_SOCKET) 
{
   printf("Error at socket(): %ld\n", WSAGetLastError());
   WSACleanup();
   return -1;
}
sockaddr_in service;
service.sin_family=AF_INET;
service.sin_port=htons(27015);
service.sin_addr.s_addr=inet_addr("127.0.0.1");
if (bind(ListenSocket,(SOCKADDR*)&service, sizeof(service))==SOCKET_ERROR) 
{
   printf("bind() failed: %ld\n", WSAGetLastError());
   closesocket(ListenSocket);
   WSACleanup();
   return -1;
}

if (listen(ListenSocket,5)==SOCKET_ERROR) 
{
   printf("listen() failed: %ld\n",WSAGetLastError());
   closesocket(ListenSocket);
   WSACleanup();
   return -1;
}
SOCKET client[FD_SETSIZE-1];   
for(int i=0;i<FD_SETSIZE;i++)   
{
   client[i] =INVALID_SOCKET; 
}
fd_set rset,allset;
FD_ZERO(&allset);   
FD_SET(ListenSocket,&allset);  
#define MSG_MAX_SIZE 1024
char buf[FD_SETSIZE-1][MSG_MAX_SIZE];  
for(;;) 
{   
rset=allset; 
int ret=select(0,&rset,NULL,NULL,NULL);
if (ret == SOCKET_ERROR) 
{   
printf("select() failed: %ld\n",WSAGetLastError());
break;
}   
     if (ret==0) 
{
continue;
}