C++解析json数据解析失败，求dalao赐教

Question

#include"books/jsoncpp-master/dist/json/json.h"
#include
#include
int main()
{
using namespace std;
ifstream is("rD:\jisuanjizuoye\dev\test233.json",ifstream::in);
Json::Reader reader;
Json::Value root;

//从字符串中读取数据
if(reader.parse(is,root))
{
/*int id = root["id"].asInt();
float x = root["x"].asFloat();
float y = root["y"].asFloat();*/
float length = root["length"].asFloat();
cout<< reader.parse(is,root);
}
cout<< reader.parse(is,root);
}

Answer 1

https://blog.csdn.net/liangchunjiang/article/details/80899212