本文实现c类型->cjson， cjson->c类型，功能为解析位姿

//#include <stdio.h>
//#include <stdlib.h>
//#include "cJSON.h"

//int main (int argc, const char * argv[]) {

//    //create a data
//   cJSON *root,*pose;
//   root=cJSON_CreateObject();

//   //pose x=1,y=2,yaw=30
//   cJSON_AddItemToObject(root, "Pose", pose=cJSON_CreateObject());
//   cJSON_AddNumberToObject(pose,"x",1);
//   cJSON_AddNumberToObject(pose,"y",2);
//   cJSON_AddNumberToObject(pose,"yaw",30);
//   char *out;
//   out=cJSON_Print(root);	cJSON_Delete(root);	printf("%s\n",out);	free(out);
//   return 0;
//}


#include <stdio.h>
#include <stdlib.h>
#include "cJSON.h"

int main (int argc, const char * argv[]) {

    //create a data
   cJSON *pose;
   pose=cJSON_CreateObject();

   //pose x=1,y=2,yaw=30
   cJSON_AddNumberToObject(pose,"x",1.0);
   cJSON_AddNumberToObject(pose,"y",2.0);
   cJSON_AddNumberToObject(pose,"yaw",30.0);
   char *out;
   out=cJSON_Print(pose);


   //get double using item_x->valuedouble
   cJSON *item_x = cJSON_GetObjectItem(pose,"x"); //获取这个对象成员
   double pose_x=item_x->valuedouble;
   printf("item_x :%lf\n",pose_x);
   cJSON_Delete(pose);	printf("%s\n",out);	free(out);


   //char to cJson using cJSON_Parse
   char * a="{\"firstName\":\"Brett\"}";
   cJSON*root=cJSON_Parse(a);
   cJSON *item_string = cJSON_GetObjectItem(root,"firstName"); //获取这个对象成员
   printf("item_x :%s\n",item_string->valuestring);

   return 0;
}