boost::write_json

Annah.Do

Hey, I constructed a property tree that I write into a file using write_xml. Now I would like to write the same propertytree to a json file, but it doesn't work.

I thought I could just use my generated property tree without any alteration.

I think I didnt really understand how the json format works.
when I write something in json all the type information gets lost, right? and also i cannot have any unnamed nodes, right?

I actually don't get anything working with json.
this is an example from the internet:
Its all fine with xml, but it doesnt work with json. Can anybody help me? Maybe it would already help if I had an example that actually compiles...

#include <boost/property_tree/json_parser.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/array.hpp>

boost::property_tree::ptree foo()
{
  boost::property_tree::ptree retval;
  retval.put("moo","12345");
  //retval.put("zoo",12345);
  return retval;
}

boost::property_tree::ptree bar()
{
  boost::property_tree::ptree retval;
  retval.put("mork","hello");
  return retval;
}

int main()
{
  boost::property_tree::ptree pt;
  pt.put_child("foo", foo() );
  pt.put_child("bar", bar() );
  boost::property_tree::write_json("file.json", pt );
  //boost::property_tree::write_xml("file.xml", pt );
  }

Annah.Do schrieb:

Its all fine with xml, but it doesnt work with json. Can anybody help me? Maybe it would already help if I had an example that actually compiles...

Compiles and runs fine with Boost 1.52 on Linux.
Outputs:

{
    "foo":
    {
        "moo": "12345"
    },
    "bar":
    {
        "mork": "hello"
    }
}

Annah.Do

Hm. Ok So I guess my version of Boost is a bit too old.
Thank you.