The example below searches all attributes of a personality given by its name pers_name for an X.509 DeviceIdentity certificate.

1. bool b_loop_attr = true;
2. gta_enum_handle_t h_enum_attr = GTA_HANDLE_ENUM_FIRST;
4. while (b_loop_attr) {
5. char attr_name[STR_LEN_MAX];
6. char attr_type[STR_LEN_MAX];
7. myio_obufstream_t ostream_attr_name = { 0 };
8. myio_obufstream_t ostream_attr_type = { 0 };
10. myio_open_obufstream(&ostream_attr_name, attr_name,
11. sizeof(attr_name), &errinfo);
12. myio_open_obufstream(&ostream_attr_type, attr_type,
13. sizeof(attr_type), &errinfo);
15. if (gta_personality_attributes_enumerate(h_inst,
16. pers_name,
17. h_enum_attr,
18. (gtaio_ostream_t *)&ostream_attr_name,
19. (gtaio_ostream_t *)&ostream_attr_type,
20. &errinfo)) {
22. /* Get the attribute holding the
23. DeviceIdentity Certificate */
25. if (0 == strncmp(attr_type,
26. "ch.iec.30168.trustlist.certificate.self.x509",
27. STR_LEN_MAX)) {
28. h_ctx = gta_context_open(h_inst,
29. pers_name,
30. "org.opcfoundation.ECC-nistP256",
31. &errinfo);
33. /* get application certificate */
34. char devid_cert[CERT_SIZE_MAX];
35. myio_obufstream_t ostream_devid_cert = { 0 };
37. myio_open_obufstream(&ostream_devid_cert,
38. devid_cert, sizeof(devid_cert), &errinfo);
40. gta_personality_get_attribute(h_ctx,
41. attr_name, (gtaio_ostream_t *)&ostream_devid_cert,
42. &errinfo);
44. /* ... make use of this DeviceIdentity Cerficate
45. (e.g., add it to a list) ... */
47. gta_context_close(h_ctx, &errinfo);
48. }
49. }
50. else {
51. b_loop_attr = false;
52. }
53. myio_close_obufstream(&ostream_attr_name, &errinfo);
54. myio_close_obufstream(&ostream_attr_type, &errinfo);
55. }