Winsock Select Learning Code (1)

SelectCli.cpp: Defines the entry point of the console application. #include "stdafx.h" #include <winsock2.h> #include <conio.h> #pragma comment (lib, "ws2_32") #define SOCKET _maxcnt64#define thread_num2//Experiment code with server cannot change the number of connection threads # define Connect_port8773#define connect_addr "127.0.0.1" DWORD WINAPI Socketfunc (lpvoid pm) {Socketsock;char buf[100] = {0};int result;struct sockaddr_in cli_addr;int num = * (int*) PM ; sock = socket (af_inet,sock_stream,0); cli_addr.sin_family = Af_inet;cli_addr.sin_port = Htons (connect_port); cli_ ADDR.SIN_ADDR.S_ADDR = inet_addr (connect_addr); result = CONNECT (sock, (struct sockaddr*) &cli_addr,sizeof (cli_ addr)); if (result = = Socket_error) {printf ("%d thread:connect error\n", num); exit (1);} while (1) {sprintf (buf, "%d thread:%s", num, "Hello world!\n");p rintf (buf); result = Send (sock,buf,100,0); if (result = = Socket_error) {printf ("2,%s\n", "Send ERROR");} Sleep (3000);}  Exit (1); return 0;} int _tmain (int argc, _tchar* argv[]) {int num[socket_maxcnt] = {0}; wsadatawsa_data;//initializes the array to the thread that distinguishes each thread number for (int i = 0; i < socket_maxcnt;i++) {Num[i] = i;} WSAStartup (Winsock_version,&wsa_data); for (int i = 0; i < thread_num;i++) {HANDLE hThread1 = CreateThread (null,0, Socketfunc,&num[i],0,null);} while (1) {Sleep (100000);} return 0;}

SelectSrv.cpp: Defines the entry point of the console application. #include "stdafx.h" #include <winsock2.h> #include <conio.h> #pragma comment (lib, "ws2_32") #define SOCKET _maxcnt64#define connect_port8773#define connect_addr "127.0.0.1" int _tmain (int argc, _tchar* argv[]) {wsadata wsa_data ; Fd_set Read_all; Socketsrv_listen = invalid_socket;struct sockaddr_in srv_addr;int result,ready_cnt;int addr_len = sizeof (SRV_ADDR); Socketrecv_sock[2] = {Invalid_socket,invalid_socket}; WSAStartup (Makeword (2,2), &wsa_data); Srv_listen = socket (af_inet,sock_stream,ipproto_tcp); srv_addr.sin_family = Af_inet;srv_addr.sin_port = Htons (connect_port); srv_addr.sin_addr.s_addr = Inaddr_any;result = Bind (Srv_listen, ( struct sockaddr*) &srv_addr,addr_len), if (result = = Socket_error) {perror ("err");p rintf ("line%d \ n", __line__); return-1;} Listen (Srv_listen,somaxconn); Fd_zero (&read_all); Fd_set (Srv_listen,&read_all); Fd_set read_set;while (1) {read_set = read_all;ready_cnt = Select (0,&read_set, Null,null,null); if (ready_cnt = = SoCket_error) {perror ("err");p rintf ("line%d \ n", __line__); return-1;} if (Fd_isset (srv_listen,&read_set)) {struct sockaddr_in faddr;int addr_len = sizeof (FADDR); static int sock_num = 0;if (Sock_num > 1) {perror ("Connect socket is too much\n");p rintf ("line%d \ n", __line__); return-1;} Recv_sock[sock_num] = Accept (Srv_listen, (struct sockaddr*) &faddr,&addr_len); if (recv_sock[sock_num] = = Invalid_socket) {perror ("err");p rintf ("line%d \ n", __line__); return-1;} Fd_set (recv_sock[sock_num],&read_all); sock_num++;continue;} for (int i = 0; i < 2;i++) {char buf[100] = {0};if (! Fd_isset (Recv_sock[i],&read_set)) {continue;} result = recv (Recv_sock[i],buf,100,null), if (Result! = Socket_error) {printf ("recv thread.%s\n", buf);}} Getch (); return 0;}

Learn the Select notation under Winsock

It would be helpful to be familiar with the original writing of the various libraries that have been encapsulated.