版本：json-c-0.9.tar.gz
参考：http://blog.csdn.net/mengyafei43/article/details/38494139
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 encodeJson();
8 void decodeJson();
9
10 int main(int argc, char **argv)
11 {
12 int ret = 0;
13
14 encodeJson();
15
16 decodeJson();
17
18 return ret;
19 }
20
21 static char *json_type_to_name(int json_type)
22 {
23 char json_type_name[128];
24
25 memset(json_type_name, 0x00, sizeof(json_type_name));
26 switch(json_type)
27 {
28 case json_type_null:
29 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_null");
30 break;
31
32 case json_type_boolean:
33 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_boolean");
34 break;
35
36 case json_type_double:
37 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_double");
38 break;
39
40 case json_type_int:
41 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_int");
42 break;
43
44 case json_type_object:
45 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_object");
46 break;
47
48 case json_type_array:
49 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_array");
50 break;
51
52 case json_type_string:
53 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_string");
54 break;
55 }
56
57 return json_type_name;
58 }
59
60 static void getFieldValue(struct json_object *child_obj, const char *field)
61 {
62 struct json_object *obj = json_object_object_get(child_obj, field);
63
64 enum json_type obj_type = json_object_get_type(obj);
65 //printf("%s json_type is %s\n", field, json_type_to_name(obj_type));
66
67 if (obj_type == json_type_int)
68 {
69 printf("%s=%d\n", field, json_object_get_int(obj));
70 }
71 else if (obj_type == json_type_string)
72 {
73 printf("%s=%s\n", field, json_object_get_string(obj));
74 }
75 }
76
77 void decodeJson()
78 {
79 const char *json_string = "{ \n\
80 \"userinfo\": [ \n\
81 { \"pin\": \"10000\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 }, \n\
82 { \"pin\": \"10001\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 }, \n\
83 { \"pin\": \"10002\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 }, \n\
84 { \"pin\": \"10003\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 }, \n\
85 { \"pin\": \"10004\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 }, \n\
86 { \"pin\": \"10005\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 }, \n\
87 { \"pin\": \"10006\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 }, \n\
88 { \"pin\": \"10007\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 }, \n\
89 { \"pin\": \"10008\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 }, \n\
90 { \"pin\": \"10009\", \"cardno\": \"123456789\", \"password\": \"123456\", \"name\": \"paul\", \"Privilege\": 14, \"flag\": 1 } \n\
91 ] }";
92
93 int ret = 0;
94 int i = 0;
95 struct json_object *root_obj = NULL;
96 struct json_object *arry_obj = NULL;
97 struct json_object *child_obj = NULL;
98 struct lh_entry *entry = NULL;
99 char *key = NULL;
100
101 root_obj = json_tokener_parse(json_string);
102 entry = json_object_get_object(root_obj)->head;
103 if (entry)
104 {
105 key = (char *)entry->k;
106 arry_obj = (struct json_object *)entry->v;
107
108 if (json_type_array != json_object_get_type(arry_obj)
109 && json_type_object != json_object_get_type(arry_obj))
110 {
111 return -1;
112 }
113
114 printf("key = %s\n", key);
115 printf("array_obj = %s\n", json_object_to_json_string(arry_obj));
116
117 if (json_type_array == json_object_get_type(arry_obj))
118 {
119 for(i = 0; i < json_object_array_length(arry_obj); i++)
120 {
121 child_obj = json_object_array_get_idx(arry_obj, i);
122 //printf("child_obj = %s\n", json_object_to_json_string(child_obj));
123
124 getFieldValue(child_obj, "pin");
125 getFieldValue(child_obj, "cardno");
126 getFieldValue(child_obj, "password");
127 getFieldValue(child_obj, "name");
128 getFieldValue(child_obj, "Privilege");
129 getFieldValue(child_obj, "flag");
130 printf("\n");
131 }
132 }
133 else if (json_type_object == json_object_get_type(arry_obj))
134 {
135
136 }
137 }
138
139 }
140
141 void encodeJson()
142 {
143 int i = 0;
144 struct json_object *root_obj = NULL;
145 struct json_object *child_obj = NULL;
146 struct json_object *array_obj = NULL;
147 char *tmpStr = NULL;
148
149 root_obj = json_object_new_object();
150 array_obj = json_object_new_array();
151
152 for(i = 0; i < 10; i++)
153 {
154 child_obj = json_object_new_object();
155
156 json_object_object_add(child_obj, "pin", json_object_new_string("10000"));
157 json_object_object_add(child_obj, "cardno", json_object_new_string("123456789"));
158 json_object_object_add(child_obj, "password", json_object_new_string("123456"));
159 json_object_object_add(child_obj, "name", json_object_new_string("paul"));
160 json_object_object_add(child_obj, "Privilege", json_object_new_int(14));
161 json_object_object_add(child_obj, "flag", json_object_new_int(1));
162
163 json_object_array_add(array_obj, child_obj);
164 child_obj = NULL;
165 }
166
167 json_object_object_add(root_obj, "userinfo", array_obj);
168
169 tmpStr = json_object_to_json_string(root_obj);
170 printf("%s\n", tmpStr);
171 }
运行结果：
时间： 2024-10-01 07:51:45