服務端使用select模型處理多客戶端

//包頭

struct dataheader

;//包體

struct login:public dataheader

char username[32];

char password[32];

};struct loginresult :public dataheader

int result;

};struct logout :public dataheader

char username[32];

};struct logoutresult :public dataheader

int result;

};std::vector g_client;

int process_solve(socket _csock)

;//5.接收客戶端新資料

int nlen = recv(_csock, szrecv, sizeof(dataheader), 0);

dataheader header = (dataheader)szrecv;

if (nlen <= 0)

switch (header->cmd)
case cmd_logout:
break;
default:
;           send(_csock, (char *)&header.cmd, sizeof(header), 0);
}    break;
}

//2.繫結

sockaddr_in _sin = {}; //建立網路位址

_sin.sin_family = af_inet;

_sin.sin_port = htons(4567); //host to network short

_sin.sin_addr.s_un.s_addr = inet_addr("127.0.0.1"); // ip位址

if (bind(_sock, (sockaddr *)&_sin, sizeof(_sin)) == socket_error)

else

//3.監聽網路埠

if (listen(_sock, 5) == socket_error)//第二個引數為最大等待多少人可以同時連線

else

while (1)

/*select(

_in_ int nfds,

_inout_opt_ fd_set far * readfds,

_inout_opt_ fd_set far * writefds,

_inout_opt_ fd_set far * exceptfds,

_in_opt_ const struct timeval far * timeout

);*/

//nfds是乙個整數值，是指fd_set集合所有的描述符（select裡的第乙個引數）的範圍（而不是數量）

//既是所有檔案描述符最大值+1

int ret = select(_sock + 1, &fd_read, &fd_write, &fd_exp, null);

if (ret < 0)

if (fd_isset(_sock, &fd_read))

;int naddrlen = sizeof(sockaddr_in);

socket _csock = invalid_socket;

_csock = accept(_sock, (sockaddr *)&clientaddr, &naddrlen);

if (_csock == invalid_socket)

g_client.push_back(_csock);

printf("新客戶端加入：socket=%d,ip = %s\n", (int)_csock, inet_ntoa(clientaddr.sin_addr));//inet_ntoa(clientaddr.sin_addr)將接收到的ip位址轉化為字串

}for (int n = 0; n < fd_read.fd_count; n++)}}

}for (int n = g_client.size(); n >= 0; n--)

//8.關閉自身的socket

closesocket(_sock);

//winsocket關閉

wsacleanup();

system("pause");

return 0;

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