https://blog.csdn.net/lintax/article/details/51549345
int str_to_cJSON(char *json_string, char *str_val)
{
char * out=NULL;
cJSON *root=cJSON_CreateObject();
if (!root)
{
printf("Error before: [%s]\n",cJSON_GetErrorPtr());
return -1;
}
else
{
cJSON *item=cJSON_CreateString("Brett");
cJSON_AddItemToObject(root,"firstName",item);
out=cJSON_Print(root);
printf("out2:%s\n",out);
cJSON_Delete(root);
if(out!=NULL)
{
free(out);
}
}
return 0;
}