USR IOT USR-TCP232-302 - Page 51

USR-TCP232-302 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
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14. char recvbuf[RECV_BUF_SIZE] = {0};
15. char sendbuf[SEND_BUF_SIZE] = {0};
16. int recvlen = 0;
17. int retlen = 0;
18. int sendlen = 0;
19. int leftlen = 0;
20. char *ptr = NULL;
21. struct sockaddr_in ser_addr;
22. memset(&ser_addr, 0, sizeof(ser_addr));
23. ser_addr.sin_family = AF_INET;
24. inet_aton("127.0.0.1", (struct in_addr *)&ser_addr.sin_addr);
25. ser_addr.sin_port = htons(SERVER_PORT);
26. sock_fd = socket(AF_INET, SOCK_STREAM, 0);
27. if(sock_fd < 0)
28. {
29. syslog(LOG_ERR, "%s:%d, create socket failed", __FILE__, __LINE__);
30. exit(1);
31. }
32. if(connect(sock_fd, (struct sockaddr *)&ser_addr, sizeof(ser_addr)) < 0)
33. {
34. syslog(LOG_ERR, "%s:%d, connect socket failed", __FILE__, __LINE__);
35. exit(1);
36. }
37. //receive data
38. recvlen = 0;
39. retlen = 0;
40. ptr = recvbuf;
41. leftlen = RECV_BUF_SIZE -1;
42. //do
43. {
44. retlen = recv(sock_fd, ptr, leftlen, 0) ;
45. if(retlen < 0)
46. {
47. if(errno == EINTR)
48. retlen = 0;
49. else
50. exit(1);
51. }
52. recvlen += retlen;
53. leftlen -= retlen;
54. ptr += retlen;
55. }
56. //while(recvlen && leftlen);
57. printf("receive data is : %s", recvbuf);
58. sprintf(sendbuf, "hello server/n");