How to create a json object from scratch in c++ using picojson.h

Question

Trying to serialize a class I have into a json string. Of course I can just write the strings manually, but I was hoping to utilize a the picojson library.

What I am trying to achieve is, given this class A

class A {
  public:
    int field1;
    string field2;
}

A a;
a.field1 = 1;
a.field2 = "example";

I want to convert this class instance "a" into a picojson object and then call picojson::serialize() to get the json string.

{"field1": 1, "field2": "example"}

Does [this](https://stackoverflow.com/questions/31121378/json-cpp-how-to-initialize-from-string-and-get-string-value) answer your question? — bhristov, Jun 22 '20 at 17:49

john · Accepted Answer · 2020-06-22T18:02:14.977

4

Well completely of the top of my head, and just by looking at the header file, it seems you need something like this

using namespace picojson;

object o;
o["field1"] = value(static_cast<double>(a.field1));
o["field2"] = value(a.field2);
std::cout << value(o);

or (what you actually asked for)

std::string s = value(o).serialize();

edited Jun 22 '20 at 18:02

answered Jun 22 '20 at 17:52

john

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Well I've now tested the above code, and made one small correction (added the static_cast), so you should be good to go. – john Jun 22 '20 at 17:56

How to create a json object from scratch in c++ using picojson.h

1 Answers1