CJson的使用

最新推荐文章于 2025-06-11 22:03:35 发布

BillyJue

最新推荐文章于 2025-06-11 22:03:35 发布

阅读量343

点赞数

CC 4.0 BY-SA版权

分类专栏： C++第三方库文章标签： Json

本文链接：https://blog.youkuaiyun.com/qq_16628589/article/details/85713227

C++第三方库专栏收录该内容

14 篇文章

订阅专栏

本文通过一个详细的示例，介绍了如何使用cJSON库创建和解析JSON数据。包括创建复杂的JSON对象，如嵌套的对象和数组，以及如何从字符串中解析JSON数据并访问其属性。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

// cJsonDemo.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "cJSON.h"
#include <windows.h>
/*
"semantic": {
   "slots": {
       "name": "张三"
   }
},
"type": 0;
"operation" : "CALL",
"service" : "telephone",
"text" : "大家好"

"children": [{
"name": "May",
"age": 2
}, {
"name": "Kendy",
"age": 3
}, {
"name": "Mark",
"age": 1
}]

}
*/
cJSON * createJson()
{
   cJSON * root = cJSON_CreateObject();
   cJSON * semtRoot = cJSON_CreateObject();
   cJSON * slotRoot = cJSON_CreateObject();
   cJSON_AddItemToObject(slotRoot, "name", cJSON_CreateString("张三"));
   cJSON_AddItemToObject(semtRoot, "slots", slotRoot);
   //cJSON_AddItemToObject(semtRoot,
   cJSON_AddItemToObject(root, "semantic", semtRoot);
   cJSON_AddItemToObject(root, "operation", cJSON_CreateString("CALL"));
   cJSON_AddItemToObject(root, "type", cJSON_CreateNumber(0));
   cJSON_AddItemToObject(root, "service", cJSON_CreateString("telephone"));
   cJSON_AddItemToObject(root, "text", cJSON_CreateString("大家好"));

   cJSON *childArray = cJSON_CreateArray();

   cJSON *child1 = cJSON_CreateObject();
   cJSON *child2 = cJSON_CreateObject();
   cJSON *child3 = cJSON_CreateObject();

   cJSON_AddItemToObject(child1, "name", cJSON_CreateString("May"));
   cJSON_AddItemToObject(child1, "age", cJSON_CreateNumber(3));
   cJSON_AddItemToObject(child2, "name", cJSON_CreateString("Kendy"));
   cJSON_AddItemToObject(child2, "age", cJSON_CreateNumber(2));
   cJSON_AddItemToObject(child3, "name", cJSON_CreateString("Mark"));
   cJSON_AddItemToObject(child3, "age", cJSON_CreateNumber(1));

   cJSON_AddItemToArray(childArray, child1);
   cJSON_AddItemToArray(childArray, child2);
   cJSON_AddItemToArray(childArray, child3);
   cJSON_AddItemToObject(root, "children", childArray);

//printf("%s\n", cJSON_Print(root));

return root;
}

void parseJson(char * cPtr)
{
   cJSON* root = cJSON_Parse(cPtr);
   cJSON * typeJson = cJSON_GetObjectItem(root, "type");
   int nType = typeJson->valueint;
   cJSON * operJson = cJSON_GetObjectItem(root, "operation");
   char *oper = operJson->valuestring;
   cJSON * serJson = cJSON_GetObjectItem(root, "service");
   cJSON * txtJson = cJSON_GetObjectItem(root, "text");
   cJSON * semJson = cJSON_GetObjectItem(root, "semantic");
   cJSON * slotsJson = cJSON_GetObjectItem(semJson, "slots");
   char *nam = cJSON_GetObjectItem(slotsJson, "name")->valuestring;
   cJSON *childArr = cJSON_GetObjectItem(root, "children");
   int nChildSize = cJSON_GetArraySize(childArr);
   cJSON* temp;
   for (int i = 0; i < nChildSize; i++)
   {
       temp = cJSON_GetArrayItem(childArr, i);
       char *name = cJSON_GetObjectItem(temp, "name")->valuestring;
       int age = cJSON_GetObjectItem(temp, "age")->valueint;
       //printf("%d", age);
   }
}
int _tmain(int argc, _TCHAR* argv[])
{
   cJSON* root = createJson();
   printf("%s\n", cJSON_Print(root));
   parseJson(cJSON_Print(root));
   Sleep(10000);

cJSON_Delete(root);
return 0;
}