Simple C ++ socket programming-based on TCP/IP protocol)

Server: # include <winsock2.h> # include <stdio. h> # pragma comment (Lib, "ws2_32.lib") void main () {// create a socket: Word myversionrequest; wsadata; myversionrequest = makeword (); int err; err = wsastartup (myversionrequest, & wsadata); If (! Err) {printf ("opened socket \ n");} else {// further bind the socket printf ("the nested word is not opened! "); Return;} socket sersocket = socket (af_inet, sock_stream, 0); // creates an identifiable socket // The parameter sockaddr_in ADDR to be bound; ADDR. sin_family = af_inet; ADDR. sin_addr.s_un.s_addr = htonl (inaddr_any); // ip address ADDR. sin_port = htons (6000); // bind port (sersocket, (sockaddr *) & ADDR, sizeof (sockaddr); // The listen (sersocket, 5) is bound ); // The second parameter indicates the maximum number of connections that can be received /////////////////////////// //////////////////////////////////////// //// // start listening /////// //////////////////////////////////////// /// // Sockaddr_in clientsocket; int Len = sizeof (sockaddr); While (1) {socket serconn = accept (sersocket, (sockaddr *) & clientsocket, & Len ); // if it is not accept but conection .. It will continuously listen to Char sendbuf [100]; sprintf (sendbuf, "Welcome % s to Bejing", inet_ntoa (clientsocket. sin_addr); // find the corresponding IP address and print this line to send (serconn, sendbuf, strlen (sendbuf) + 100); char receivebuf []; // receive Recv (serconn, receivebuf, strlen (receivebuf) +); printf ("% s \ n", receivebuf); closesocket (serconn ); // close wsacleanup (); // actions to release resources} client: # include <winsock2.h> # include <stdio. h> # pragma comment (Lib, "ws2_32.lib") VO Id main () {int err; Word versionrequired; wsadata; versionrequired = makeword (1, 1); err = wsastartup (versionrequired, & wsadata ); // If (! Err) {printf ("the nested character of the client has been opened! \ N ");} else {printf (" An error occurred while opening the nested words on the client! \ N "); return; // end} socket clientsocket = socket (af_inet, sock_stream, 0); sockaddr_in clientsock_in; success = inet_addr (" 127.0.0.1 "); success = af_inet; clientsock_in.sin_port = htons (6000); // BIND (clientsocket, (sockaddr *) & clientsock_in, strlen (sockaddr); // pay attention to the third parameter // listen (clientsocket, 5); Connect (clientsocket, (sockaddr *) & clientsock_in, sizeof (sockaddr); // start to connect char receivebuf [100]; Recv (clientsocket, receivebuf ); printf ("% s \ n", receivebuf); send (clientsocket, "Hello, this is client", strlen ("Hello, this is client") + 1, 0 ); closesocket (clientsocket); wsacleanup ();}