cJSON使用方法
作者：互联网
1 #include <iostream>
2 #include "cJSON.h"
3
4 using namespace std;
5
6 //1.一个简单的JSON键值对构建
7 void Create_Simple_JSON(void)
8 {
9 cJSON *root;
10 root = cJSON_CreateObject();//创建一个json对象
11 cJSON_AddItemToObject(root, "CSDN", cJSON_CreateString("https://blog.csdn.net/whik1194"));
12 cJSON_AddItemToObject(root, "cnblogs", cJSON_CreateString("https://home.cnblogs.com/u/whik/"));
13 cJSON_AddItemToObject(root, "Github", cJSON_CreateString("https://github.com/whik/"));
14 cJSON_AddStringToObject(root, "Blog", "http://www.wangchaochao.top/");
15
16 printf("构建的JSON:\n%s\n", cJSON_Print(root));
17 cJSON_Delete(root);
18 }
19
20 //2.键的值是一个JSON对象
21 void Create_BJTime_JSON(void)
22 {
23
24 cJSON *root;
25 cJSON *result;
26
27 root = cJSON_CreateObject();//创建一个json对象
28
29 result = cJSON_CreateObject();
30 //result构建
31
32 cJSON_AddStringToObject(result, "timestamp", "ok");
33 cJSON_AddStringToObject(result, "datetime_1", "2019-07-21 10:46:57");
34 cJSON_AddStringToObject(result, "datetime_2", "2019年07月21日 10时46分57秒");
35 cJSON_AddStringToObject(result, "week_1", "0");
36 cJSON_AddStringToObject(result, "week_2", "星期日");
37 cJSON_AddStringToObject(result, "week_3", "周日");
38 cJSON_AddStringToObject(result, "week_4", "Sunday");
39
40 cJSON_AddStringToObject(root, "status", "success");
41 cJSON_AddItemToObject(root, "result", result);
42 cJSON_AddStringToObject(root, "Blog", "www.wangchaochao.top");
43
44 printf("构建的JSON:\n%s\n", cJSON_Print(root));
45 cJSON_Delete(root);
46 }
47
48 //3.JSON数组，元素是字符串
49 void Create_Array_Str_JSON(void)
50 {
51 cJSON *root;
52 const char *strings[7]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
53
54 root=cJSON_CreateStringArray(strings,7);
55
56 printf("%s\n",cJSON_Print(root));
57 cJSON_Delete(root);
58 }
59
60 //4.键的值是一个数组，数组包含多个对象元素
61 void Create_Array_JSON(void)
62 {
63 cJSON *root;
64 cJSON *forceast;
65 cJSON *day1, *day2, *day3; //数组
66
67 day1 = cJSON_CreateObject();
68 day2 = cJSON_CreateObject();
69 day3 = cJSON_CreateObject();
70
71 cJSON_AddStringToObject(day1, "date", "2019-07-21"); //日期
72 cJSON_AddStringToObject(day1, "cond_txt", "多云"); //天气状况
73 cJSON_AddStringToObject(day1, "cond_code", "101"); //天气代码
74 cJSON_AddStringToObject(day1, "hum", "23"); //湿度
75 cJSON_AddStringToObject(day1, "tmp_H", "31"); //最高温度
76 cJSON_AddStringToObject(day1, "tmp_L", "25"); //最低温度
77
78 cJSON_AddStringToObject(day2, "date", "2019-07-22");
79 cJSON_AddStringToObject(day2, "cond_txt", "晴");
80 cJSON_AddStringToObject(day2, "cond_code", "100");
81 cJSON_AddStringToObject(day2, "hum", "20");
82 cJSON_AddStringToObject(day2, "tmp_H", "33");
83 cJSON_AddStringToObject(day2, "tmp_L", "26");
84
85 cJSON_AddStringToObject(day3, "date", "2019-07-23");
86 cJSON_AddStringToObject(day3, "cond_txt", "阵雨");
87 cJSON_AddStringToObject(day3, "cond_code", "107");
88 cJSON_AddStringToObject(day3, "hum", "45");
89 cJSON_AddStringToObject(day3, "tmp_H", "32");
90 cJSON_AddStringToObject(day3, "tmp_L", "25");
91
92 forceast = cJSON_CreateArray();
93 //注意顺序，索引依次递增
94 cJSON_AddItemToArray(forceast, day1); //元素0
95 cJSON_AddItemToArray(forceast, day2); //元素1
96 cJSON_AddItemToArray(forceast, day3); //元素2
97
98 root = cJSON_CreateObject(); //创建一个json对象
99
100 cJSON_AddStringToObject(root, "status", "ok");
101 cJSON_AddItemToObject(root, "weather", forceast);
102 cJSON_AddStringToObject(root, "update", "2019-07-21 11:00");
103 cJSON_AddStringToObject(root, "Blog", "www.wangchaochao.top");
104 //等效于:cJSON_AddItemToObject(root, "update", cJSON_CreateString("2019-07-21 11:00");
105
106 printf("构建的JSON:\n%s\n", cJSON_Print(root));
107 cJSON_Delete(root);
108 }
109
110 //5.数组内嵌套了5个数组，每个数组内有5个字符串元素
111 void Create_Array_Nest_JSON(void)
112 {
113 struct oil_stu{
114 char *city; //城市名称
115 char *oil_92_price; //92号汽油价格
116 char *oil_95_price;
117 char *oil_98_price;
118 char *oil_0_price;
119 };
120
121 cJSON *root;
122 cJSON *data; //包含多个数组
123 cJSON *table, *data_bj, *data_sh, *data_js, *data_tj;
124
125 const char *bj_str[5] = {"北京", "6.78", "7.21", "8.19", "6.45"};
126 const char *sh_str[5] = {"上海", "6.74", "7.17", "7.87", "6.39"};
127 const char *js_str[5] = {"江苏", "6.75", "7.18", "8.06", "6.37"};
128 const char *tj_str[5] = {"天津", "6.77", "7.15", "8.07", "6.41"};
129 const char *talbe_str[5] = {"地区", "92号汽油", "95号汽油", "98号汽油", "0号柴油"};
130
131 data_bj = cJSON_CreateStringArray(bj_str, 5); //只包含5个字符串的数组
132 data_sh = cJSON_CreateStringArray(sh_str, 5);
133 data_js = cJSON_CreateStringArray(js_str, 5);
134 data_tj = cJSON_CreateStringArray(tj_str, 5);
135 table = cJSON_CreateStringArray(talbe_str, 5);
136
137 data = cJSON_CreateArray();
138 cJSON_AddItemToArray(data, table);
139 cJSON_AddItemToArray(data, data_bj);
140 cJSON_AddItemToArray(data, data_sh);
141 cJSON_AddItemToArray(data, data_js);
142 cJSON_AddItemToArray(data, data_tj);
143
144 root = cJSON_CreateObject();
145
146 cJSON_AddStringToObject(root, "status", "ok");
147 cJSON_AddStringToObject(root, "msg", "2019-07-21 11:00");
148 cJSON_AddStringToObject(root, "update", "2019-07-21 11:00");
149 cJSON_AddItemToObject(root, "data", data);
150 cJSON_AddStringToObject(root, "About", "wcc");
151 cJSON_AddStringToObject(root, "Blog", "www.wangchaochao.top");
152
153 printf("构建的JSON:\n%s\n", cJSON_Print(root));
154 cJSON_Delete(root);
155 }
156
157 int main() {
158 Create_Simple_JSON();
159 cout << endl << endl;
160 Create_BJTime_JSON();
161 cout << endl << endl;
162 Create_Array_Str_JSON();
163 cout << endl << endl;
164 Create_Array_JSON();
165 cout << endl << endl;
166 Create_Array_Nest_JSON();
167 return 0;
168 }
标签：cJSON,方法,data,AddStringToObject,JSON,result,使用,root 来源： https://www.cnblogs.com/yuhong1103/p/14976264.html