讀寫的文件，有普通的json格式的文件，還有數組形式的json格式的文件。
讀普通的文件使用：
guoyanzhang@debian:~/test$ cat test.json
{"group":1,"test":2}
讀數組形式的文件使用：
guoyanzhang@debian:~/test$ cat test1.json
[{"group":1,"test":2},{"group":2,"test":3},{"group":12,"test":13},{"group":12,"test":13}]
代碼如下：
普通文件：
444 void TestReadJsonFile_object(void)
445 {
446 char *file = "./test.json";
447 json_object *pstObj = NULL;
448 json_object *sonPstObj = NULL;
449 pstObj = json_object_from_file(file);
450
451 int group = 0;
452 int test = 0;
453 if (NULL == pstObj)
454 {
455 printf("%s : json_tokener_parse failed.\n", __FUNCTION__);
456 return;
457 }
458 else
459 {
460 //if (json_object_get_type(pstObj) != json_type_array)
461 if (json_object_get_type(pstObj) != json_type_object)
462 {
463 json_object_put(pstObj);
464 printf("an error json string!\n");
465 return;
466 }
467 printf("%p\n", pstObj);
468 json_object_object_foreach(pstObj, key1, val1)
469 {
470 if (0 == strcmp(key1, "group"))
471 {
472 group = json_object_get_int(val1);
473 printf("group = %d\n", group);
474 }
475 if (0 == strcmp(key1, "test"))
476 {
477 test = json_object_get_int(val1);
478 printf("test = %d\n", test);
479 }
480 }
481 json_object_put(pstObj);
482 }
483
484 }
數組文件：
486 void TestReadJsonFile_array(void)
487 {
488 char *file = "./test1.json";
489 json_object *pstObj = NULL;
490 json_object *sonPstObj = NULL;
491 pstObj = json_object_from_file(file);
492
493 int group = 0;
494 int test = 0;
495 if (NULL == pstObj)
496 {
497 printf("%s : json_tokener_parse failed.\n", __FUNCTION__);
498 return;
499 }
500 else
501 {
502 json_object *pValue = NULL;
503
504 json_object *pObj = json_object_new_object();
505 pValue = json_object_new_int(12);
506 json_object_object_add(pObj, "group", pValue);
507 pValue = json_object_new_int(13);
508 json_object_object_add(pObj, "test", pValue);
509
510 json_object_array_add(pstObj, pObj); //將對象加入數組
511
512
513 json_object_to_file(file, pstObj);
514 #if 1
515 if (json_object_get_type(pstObj) != json_type_array)
516 //if (json_object_get_type(pstObj) != json_type_object)
517 {
518 json_object_put(pstObj);
519 printf("an error json string!\n");
520 return;
521 }
522 //printf("%p\n", pstObj);
523 int count = json_object_array_length(pstObj);
524 printf("count = %d\n", count);
525 int i = 0;
526 struct json_object *arrayObj = NULL;
527 for (;i < count; i++)
528 {
529 arrayObj = json_object_array_get_idx(pstObj, i);
530 json_object_object_foreach(arrayObj, key1, val1)
531 {
532 if (0 == strcmp(key1, "group"))
533 {
534 group = json_object_get_int(val1);
535 printf("group = %d\n", group);
536 }
537 if (0 == strcmp(key1, "test"))
538 {
539 test = json_object_get_int(val1);
540 printf("test = %d\n", test);
541 }
542 }
543
544 }
545 #endif
546 json_object_put(pstObj);
547 }
代碼運行結果：
-----------------------------------------------------
0x5567961aacd0
group = 1
test = 2
-----------------------------------------------------
count = 4
group = 1
test = 2
group = 2
test = 3
group = 12
test = 13
group = 12
test = 13