C ++ socket programming example

Server:

1. # Include "stdafx. H"
2. # Include <winsock2.h>
4. # Pragma comment (Lib, "ws2_32.lib ")
6. # Define port_number 11234
7. # Define max_buf_size 1024
8. Int _ tmain (INT argc, _ tchar * argv [])
9. {
10. Wsadata;
11. Word dwsockversion = makeword (2, 2 );
12. If (0! = Wsastartup (dwsockversion, & wsadata) // negotiate the version number
13. {
14. Printf ("arrange version failure ");
15. Return-1;
16. }
18. Socket nsocket;
19. Nsocket = socket (af_inet, sock_stream, ipproto_tcp); // create a TCP socket
20. If (invalid_socket = nsocket)
21. {
22. Printf ("invalid socket ");
23. Wsacleanup ();
24. Return-1;
25. }
27. Sockaddr_in SA;
28. SA. sin_family = af_inet;
29. SA. sin_addr.s_addr = inet_addr ("127.0.0.1 ");
30. SA. sin_port = htons (port_number); // select a port number.
32. If (BIND (nsocket, (sockaddr *) & SA, sizeof (SA) <0) // bind
33. {
34. Closesocket (nsocket );
35. Return-1;
36. }
37. Listen (nsocket, 2 );
39. Sockaddr_in addr_client;
40. Int naddrlen = sizeof (addr_client );
41. While (true)
42. {
43. // Socket nsock = accept (nsocket, (sockaddr *) & addr_client, & naddrlen );
44. Socket nsock = accept (nsocket, null, null );
45. If (invalid_socket = nsock)
46. {
47. Printf ("failure to accept ");
48. Continue;
49. }
51. Char TMP [max_buf_size] = {0 };
52. Char Buf [max_buf_size] = {0 };
53. Strcpy (TMP, "this is server ");
54. Send (nsock, TMP, (INT) strlen (TMP), 0 );
55. Int nrecv = Recv (nsock, Buf, max_buf_size, 0 );
56. If (nrecv> 0)
57. {
58. Printf ("% s/n", Buf );
59. }
60. Closesocket (nsock );
62. Return 0;
63. }
65. }

 

Client:

1. # Include "stdafx. H"
2. # Include <winsock2.h>
4. # Pragma comment (Lib, "ws2_32.lib ")
6. # Define max_buf_size 1024
7. # Define port_number 11234
8. Int _ tmain (INT argc, _ tchar * argv [])
9. {
11. Wsadata;
12. Word dwsockversion = makeword (2, 2 );
13. If (0! = Wsastartup (dwsockversion, & wsadata) // negotiate the version number
14. {
15. Printf ("arrange version failure ");
16. Return-1;
17. }
19. Socket nsocket;
20. Nsocket = socket (af_inet, sock_stream, ipproto_tcp); // create a TCP socket
21. If (invalid_socket = nsocket)
22. {
23. Printf ("invalid socket ");
24. Wsacleanup ();
25. Return-1;
26. }
28. Sockaddr_in SA;
29. SA. sin_family = af_inet;
30. SA. sin_addr.s_addr = inet_addr ("127.0.0.1 ");
31. SA. sin_port = htons (port_number );
32. If (0! = Connect (nsocket, (const sockaddr *) & SA, sizeof (SA )))
33. Return-1;
35. Char Buf [max_buf_size] = {0 };
36. Char TMP [max_buf_size] = {0 };
37. Strcpy (TMP, "this is client! ");
38. Int nrecv = 0;
39. Nrecv = Recv (nsocket, Buf, max_buf_size, 0 );
40. If (nrecv> 0)
41. {
42. Printf ("% s/n", Buf );
43. Send (nsocket, TMP, (INT) strlen (TMP), 0 );
44. }
46. Closesocket (nsocket );
47. Wsacleanup ();
49. Return 0;
50. }