拷备.c和.h文件到指定的目录中

  #include <stdio.h>
  #include <unistd.h>
  #include <stdlib.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <string.h>
 #include "cJSON.h"                                                                                                                  
  
 int main(int argc, char *argv[])                                                         
  {
             
      // 创建对象
     cJSON* obj = cJSON_CreateObject();
      // 创建子对象
     cJSON* subObj = cJSON_CreateObject();
      // 添加key-value
    cJSON_AddItemToObject(subObj,"factory",cJSON_CreateString("一汽大众"));
    cJSON_AddItemToObject(subObj,"last",cJSON_CreateNumber(31));
     cJSON_AddItemToObject(subObj,"price",cJSON_CreateNumber(83));
     cJSON_AddItemToObject(subObj,"sell",cJSON_CreateNumber(49));
     cJSON_AddItemToObject(subObj,"sum",cJSON_CreateNumber(80));
      // 创建数组
     cJSON* array = cJSON_CreateArray();
     cJSON_AddItemToArray(array,cJSON_CreateNumber(123));
     cJSON_AddItemToArray(array,cJSON_CreateNumber(1));
     cJSON_AddItemToArray(array,cJSON_CreateString("hello,world"));
      // 创建对象
     cJSON* childObj = cJSON_CreateObject();
     cJSON_AddItemToObject(childObj,"梅塞奔驰",cJSON_CreateString("心所向，持以恒"));
      cJSON_AddItemToArray(array,childObj);
      cJSON_AddItemToObject(subObj,"othre",array);
  
      // obj中添加key - value
      cJSON_AddItemToObject(obj,"奔驰",subObj);
  
      // 数据格式化
      char* data = cJSON_Print(obj);
      FILE* fp = fopen("car.json","w");
      fwrite(data,sizeof(char),strlen(data)+1,fp);
      fclose(fp);
      
          return 0;
  }

gcc *.c -o app -lm -I./include

{
        "奔驰": {
                "factory":      "一汽大众",
                "last": 31,
                "price": 83,
                "sell": 49,
                "sum":  80,
                "othre":        [123, 1, "hello,world", {
                                "梅塞奔驰":     "心所向，持以恒"
                        }]
        }
}

cJSON解析json文件