Mac OS X socket 2 [a simple example]

Mac OS X socket 2 [a simple example]

Xcode-> new Workspace

Xcode-> new project: C: [add to:?]

Server:

Code

//// Main. C // S2 // server // created by DMD on 4/7/14. # include <stdio. h> # include <sys/types. h> # include <sys/socket. h> # include <netinet/in. h> # include <ARPA/inet. h> # include <unistd. h> # include <string. h> # include <stdlib. h> # include <fcntl. h> # include <sys/SHM. h> # define myport 12345 # define queue 20 # define buffer_size 1024 // severint main (INT argc, const char * argv []) {printf ("\ nserver: \ n "); // defines sockfd in T server_sockfd = socket (af_inet, sock_stream, 0); If (-1 = server_sockfd) {printf ("initialize socket fail! \ R \ n "); Return-1;} printf (" initialize socket OK! \ R \ n "); // defines sockaddr_in struct sockaddr_in server_sockaddr; outputs = af_inet; outputs = htons (myport); outputs = htonl (inaddr_any); // bind, if (BIND (server_sockfd, (struct sockaddr *) & server_sockaddr, sizeof (server_sockaddr) =-1) {perror ("bind "); exit (1);} printf ("bind OK! \ R \ n "); // listen, 0 is returned for success, and-1 If (Listen (server_sockfd, queue) =-1) is returned for error) {perror ("listen"); exit (1);} printf ("Starting Listen ...... \ r \ n "); printf (" (please run client and input something) \ r \ n "); // client socket char buffer [buffer_size]; char send_client_buffer [buffer_size]; struct sockaddr_in client_addr; socklen_t length = sizeof, (struct so Ckaddr *) & client_addr, & length); If (conn <0) {perror ("Accept connect failed"); exit (1 );} printf ("START accept data from client... \ r \ n "); While (1) {memset (buffer, 0, sizeof (buffer); memset (send_client_buffer, 0, sizeof (send_client_buffer )); // start to accept the message from the server int Len = Recv (Conn, buffer, sizeof (buffer), 0); // printf ("client said, \ "% s \" \ n ", buffer); printf (" client said: % s ", buffer); // If you enter" exit ", the server will jump out of the while, That is, no longer accept data from the client, and disable the server if (strcmp (buffer, "Exit \ n") = 0) {break;} else if (strcmp (buffer, "100 \ n") = 0) {sprintf (send_client_buffer, "Hello, this is One handred: % s", buffer);} else if (strcmp (buffer, "30 \ n") = 0) {sprintf (send_client_buffer, "Hello, this is thirty: % s", buffer);} else {sprintf (send_client_buffer, "server repeat you said that is: % s", buffer); // output information to the screen // fputs (send_client_buffer, stdou T);} // send the string buffer to the conn of the client. Send (Conn, send_client_buffer, strlen (send_client_buffer), 0); memset (buffer, 0, sizeof (buffer); memset (send_client_buffer, 0, sizeof (send_client_buffer ));} // close the connection close (conn); close (server_sockfd); Return 0;} // end

Xcode-> new project: C:

Client:

Code

//// Main. C // C2 // client // created by DMD on 4/7/14. # include <sys/types. h> # include <sys/socket. h> # include <stdio. h> # include <netinet/in. h> # include <ARPA/inet. h> # include <unistd. h> # include <string. h> # include <stdlib. h> # include <fcntl. h> # include <sys/SHM. h> # define myport 12345 # define buffer_size 1024 // Add a parameter to the main function to obtain an unknown character during the first input. // Int main (INT argc, const char * argv []) int main () {printf ("\ nclient: \ n "); /// define sockfd int sock_cli = socket (af_inet, sock_stream, 0); If (-1 = sock_cli) {printf ("initialize socket fail! \ R \ n "); Return-1;} // printf (" initialize socket OK! \ R \ n "); // defines sockaddr_in struct sockaddr_in servaddr; memset (& servaddr, 0, sizeof (servaddr); servaddr. sin_family = af_inet; servaddr. sin_port = htons (myport); // server port servaddr. sin_addr.s_addr = inet_addr ("127.0.0.1"); // server IP // connect to the server, 0 is returned for success, and-1 is returned for error if (connect (sock_cli, (struct sockaddr *) & servaddr, sizeof (servaddr) <0) {perror ("Connect"); exit (1) ;}printf ("Success connect Server IP: % d, Port: % D! \ R \ n ", servaddr. sin_addr.s_addr, servaddr. sin_port); printf ("please type something to server: \ r \ n"); char sendbuf [buffer_size]; char recvbuf [buffer_size]; memset (sendbuf, 0, sizeof (sendbuf); memset (recvbuf, 0, sizeof (recvbuf); // client: Enter the string to sendbuf and press enter to end while (fgets (sendbuf, sizeof (sendbuf), stdin )! = NULL) {// send data to the server side send (sock_cli, sendbuf, strlen (sendbuf), 0); // send // If the input is exit, exit if (strcmp (sendbuf, "Exit \ n") = 0) {break;} // receives the feedback from the server. Recv (sock_cli, recvbuf, sizeof (recvbuf), 0); // receive // output information to the screen // fputs (recvbuf, stdout); printf ("% s", recvbuf ); memset (sendbuf, 0, sizeof (sendbuf); memset (recvbuf, 0, sizeof (recvbuf);} Close (sock_cli); Return 0 ;}

Test:

Step1.run Server

Step2.run Client

In client type:

100 enter

30 enter

Hello

Success!

Schematic diagram: communication between the server and the client

End

By DMD