(json-c学习1) linux c语言解析json数组（纯代码）
1 #include "json.h"
2 #include
3 #include
4 #include
5
6 #define OR_GROUP "group"
7 #define LOOP_NUMBER "loop_number"
8 #define SENSOR_ADDRESS "sensor_address"
9 #define BODY "body"
10 #define MODULE_ID "module_id"
11
12 char *TestBodyFunction(void)
13 {
14 int len = 0;
15 char *jsonMsgBuf = NULL;
16 char *str = "{\"group\":1, \"loop_number\":1, \"sensor_address\":1, \"body\":[{\"loop_number\":1, \"module_id\":2}, \
17 {\"loop_number\":1, \"module_id\":3}, {\"loop_number\":1, \"module_id\":4}]}";
18 len = strlen(str);
19 printf("len = %d\n", len);
20 printf("str = %s\n", str);
21
22 jsonMsgBuf = (char *)malloc(len+1);
23 memset(jsonMsgBuf, 0, len+1);
24 memcpy(jsonMsgBuf, str, len);
25 return jsonMsgBuf;
26 }
27
28 //struct json_object *TestArrayFunction(void)
29 char *TestArrayFunction(void)
30 {
31 int len = 0;
32 //struct json_object *jsonMsgBuf = NULL;
33 char *jsonMsgBuf = NULL;
34 char *str = "[{\"loop_number\":1, \"sensor_address\":2}, {\"loop_number\":1, \"sensor_address\":3}, {\"loop_number\":1, \"sensor_address\":4}]";
35 len = strlen(str);
36 printf("len = %d\n", len);
37 printf("str = %s\n", str);
38
39 //jsonMsgBuf = (struct json_object*)malloc(len+1);
40 jsonMsgBuf = (char *)malloc(len+1);
41 if (jsonMsgBuf == NULL)
42 {
43 printf("failed to malloc!\n");
44 }
45 memset(jsonMsgBuf, 0, len+1);
46 memcpy(jsonMsgBuf, str, len);
47 return jsonMsgBuf;
48 }
49
50 int ParsingBodyFunction(char *jsonMsgBuf)
51 {
//解析内容格式：
/*
{
"group":1,
"loop_number":1,
"sensor_address":1,
"body":
[
{"loop_number":1, "module_id":1},
{"loop_number":1, "module_id":2},
{"loop_number":1, "module_id":3},
...
]
}
*/
52 int groupId = 0;
53 int ln = 0;
54 int sd = 0;
55 int count = 0;
56 int lnn = 0;
57 int mi = 0;
58 int i = 0;
59 json_object *pstObj = NULL;
60 json_object *array = NULL;
61 json_object *arrayObj = NULL;
62 pstObj = json_tokener_parse(jsonMsgBuf);
63 if (NULL == pstObj)
64 {
65 printf("%s : json_tokener_parse failed.\n", __FUNCTION__);
66 }
67 else
68 {
69 json_object_object_foreach(pstObj, key1, val1)
70 {
71 if (0 == strcmp(key1, OR_GROUP))
72 {
73 groupId = json_object_get_int(val1);
74 printf("groupId = %d\n", groupId);
75 }
76 else if (0 == strcmp(key1, LOOP_NUMBER))
77 {
78 ln = json_object_get_int(val1);
79 printf("ln = %d\n", ln);
80 }
81 else if (0 == strcmp(key1, SENSOR_ADDRESS))
82 {
83 sd = json_object_get_int(val1);
84 printf("sd = %d\n", sd);
85 }
86 else if (0 == strcmp(key1, BODY))
87 {
88 count = json_object_array_length(val1);
89 printf("count = %d\n", count);
90 //array = json_object_get_array(val1);
91 for (i = 0; i < count; i++)
92 {
93 arrayObj = json_object_array_get_idx(val1, i);
94 json_object_object_foreach(arrayObj, key2, val2)
95 {
96 if (0 == strcmp(key2, LOOP_NUMBER))
97 {
98 lnn = json_object_get_int(val2);
99 printf("lnn = %d\n", lnn);
100 }
101 else if (0 == strcmp(key2, MODULE_ID))
102 {
103 mi = json_object_get_int(val2);
104 printf("mi = %d\n", mi);
105 }
106 }
107 }
108 }
109 }
110 }
111 }
112
113 //单个传感器id
114 typedef struct _SinglePointIdStruct
115 {
116 int loopNumber;
117 int sensorAddress;
118 } SinglePointIdStruct;
119
120 //int ParsingArrayFunction(struct json_object *jsonMsgBuf)
121 int ParsingArrayFunction(char *jsonMsgBuf)
122 {
//解析内容格式：
/*
[
{"loop_number": 1, "sensor_address":1},
{"loop_number": 1, "sensor_address":1},
{"loop_number": 2, "sensor_address":1},
{"loop_number": 2, "sensor_address":1},
…
]
*/
123 int i = 0;
124 int count = 0;
125 struct json_object *arrayObj = NULL;
126 json_object *array = NULL;
127
128 // struct array_list *array = json_object_get_array(jsonMsgBuf);
129 //struct json_object *array = jsonMsgBuf;
130 array = json_tokener_parse(jsonMsgBuf);
131 int ln = 0;
132 int sd = 0;
133 SinglePointIdStruct *moduleArray = NULL;
134 if (NULL == array)
135 {
136 printf("%s : json_tokener_parse failed.\n", __FUNCTION__);
137 return -1;
138 }
139 else
140 {
141 count = json_object_array_length(array);
142 printf("array count = %d\n", count);
143 moduleArray = (SinglePointIdStruct*)malloc(count*sizeof(SinglePointIdStruct));
144 if (moduleArray == NULL)
145 {
146 printf("%s malloc failed!\n");
147 return -2;
148 }
149 for (i = 0; i < count; i++)
150 {
151 arrayObj = json_object_array_get_idx(array, i);
152 json_object_object_foreach(arrayObj, key1, val1)
153 {
154 if (0 == strcmp(key1, LOOP_NUMBER))
155 {
156 ln = json_object_get_int(val1);
157 printf("array ln = %d\n", ln);
158 }
159 else if (0 == strcmp(key1, SENSOR_ADDRESS))
160 {
161 sd = json_object_get_int(val1);
162 printf("array sd = %d\n", sd);
163 }
164 //AllSensorInfoArray[ln-1][sd-1].startStopFlag = 1; //表示要启动
165 }
166 }
167 }
168 }
169
170 int main(void)
171 {
172 char *body = TestBodyFunction();
173 ParsingBodyFunction(body);
174 printf("=====================================================\n");
175 //struct json_object *array = TestArrayFunction();
176 char *array = TestArrayFunction();
177 ParsingArrayFunction(array);
178 return 0;
179 }
180
181
需要这些头文件（到json库中去找）：
运行结果：
