JSON-C库的使用（2）Json对象的遍历

示例代码：

  1 #include <stdio.h>
  2 #include <string.h>
  3 #include <stdlib.h>
  4 #include <unistd.h>
  5 #include "json.h"
  6
  7 void parseJsonString(struct json_object *obj);
  8
  9 int main(int argc, char **argv)
 10 {
 11     const char *json_string = "{\n\
 12         \"errNum\": 0,\n\
 13         \"errMsg\": \"success\",\n\
 14         \"shanghai\": {\n\
 15             \"name\": \"szzs\",\n\
 16             \"curdot\": 2323.554,\n\
 17             \"curprice\": -5.897,\n\
 18             \"rate\": 0.25,\n\
 19             \"dealnumber\": 11586,\n\
 20             \"turnover\": 98322,\n\
 21         },\n 22         \"shengzhen\": {\n\
 23             \"name\": \"scz\",\n\
 24             \"curdot\": 2323.554,\n\
 25             \"curprice\": -5.897,\n\
 26             \"rate\": 0.25,\n\
 27             \"dealnumber\": 11586,\n\
 28             \"turnover\": 98322,\n\
 29         },\n 30     }";
 31     int ret = 0;
 32     struct json_object *obj = NULL;
 33
 34     printf("%s\n", json_string);
 35     obj = json_tokener_parse(json_string);
 36
 37     parseJsonString(obj);
 38
 39     if (is_error(obj))
 40     {
 41         printf("json_tokener_parse error: %s\n", json_tokener_errors[-(unsigned long )obj]);
 42         return -1;
 43     }
 44
 45     if (obj)
 46     {
 47         json_object_put(obj);
 48         obj = NULL;
 49     }
 50
 51     return 0;
 52 }
 53
 54
 55 void parseJsonString(struct json_object *obj)
 56 {
 57     char *key = NULL;
 58     struct lh_entry *entry = NULL;
 59     struct json_object* val = NULL;
 60
 61     entry = json_object_get_object(obj)->head;
 62
 63     while (entry)
 64     {
 65         key = (char *)entry->k;
 66         val = (struct json_object *)entry->v;
 67
 68         printf("key: %s\n", key);
 69         switch (json_object_get_type(val))
 70         {
 71             case json_type_null:
 72                 printf("json type: json_type_null\n");
 73                 printf("val: %s\n\n", json_object_get_string(val));
 74                 break;
 75
 76             case json_type_boolean:
 77                 printf("json type: json_type_boolean\n");
 78                 printf("val: %d\n\n", json_object_get_boolean(val));
 79                 break;
 80
 81             case json_type_double:
 82                 printf("json type: json_type_double\n");
 83                 printf("val: %f\n\n", json_object_get_double(val));
 84                 break;
 85
 86             case json_type_int:
 87                 printf("json type: json_type_int\n");
 88                 printf("val: %d\n\n", json_object_get_int(val));
 89                 break;
 90
 91             case json_type_object:
 92                 printf("json type: json_type_object\n");
 93                 printf("val: %s\n\n", json_object_get_string(val));
 94                 parseJsonString(val);
 95                 break;
 96
 97             case json_type_array:
 98                 printf("json type: json_type_array\n");
 99                 printf("val: %s\n\n", json_object_get_string(val));
100                 break;
101
102             case json_type_string:
103                 printf("json type: json_type_string\n");
104                 printf("val: %s\n\n", json_object_get_string(val));
105                 break;
106
107         }
108
109         entry = entry->next;
110         if (NULL == entry)
111         {
112             printf("there is an end\n");
113         }
114     }
115 }