Unhandled exception when trying to retrieve the value from the JSON ptree using Boost C++

I am getting the below error when reading the value from the JSON ptree using Boost C++

Unhandled exception at 0x7682B502 in JSONSampleApp.exe: Microsoft C++ exception : 
boost::wrapexcept<boost::property_tree::ptree_bad_path> at memory location 0x00DFEB38.

Below is the program, Could someone please help me what i am missing here.

#include <string>
#include <iostream>
#include <boost/property_tree/json_parser.hpp>
#include <boost/property_tree/ptree.hpp>
#include <boost/foreach.hpp>

using namespace std;

using boost::property_tree::ptree;

int main()
{
    const char* f_strSetting = "{\"Student\": {\"Name\":\"John\",\"Course\":\"C++\"}}";

    boost::property_tree::ptree pt1;
    std::istringstream l_issJson(f_strSetting);
    boost::property_tree::read_json(l_issJson, pt1);

    BOOST_FOREACH(boost::property_tree::ptree::value_type & v, pt1.get_child("Student"))
    {
        std::string l_strColor;
        std::string l_strPattern;
        l_strColor = v.second.get <std::string>("Name");
        l_strPattern = v.second.get <std::string>("Course");
    }
    return 0;
}

Solution

There is a shape mismatch between your code and your data:

The data is a plain nested dictionary: Student.name is "John".
The code expects to see an array under the Student key, so it tries to fetch Student.0.name, Student.1.name, ... for every subitem of Student.

Either fix the code:

// Drop the BOOST_FOREACH
auto & l_Student = pt1.get_child("Student");
l_strColor = l_Student.get<std::string>("Name");

or fix the data:

// Note the extra []
const char * f_strSetting = R"({"Student": [{"Name":"John","Course":"C++"}]})";