foo.cxx

#include <stdlib.h>
#include <iostream>
#include "picojson.h"

using namespace std;
using namespace picojson;

int main(void) {
	value v;
	const char *text = "{\"val\":\"1\",\"arr\":[1,2,3],\"obj\":{\"foo\":\"bar\", \"bar\":\"baz\"}}";
	string err = parse(v, text, text + strlen(text));
	cout << "root is error? : " << (err.empty()    ? "no"  : "yes") << endl;
	cout << "root is object?: " << (v.is<object>() ? "yes" :  "no") << endl;
	cout << "root is array? : " << (v.is<array>()  ? "yes" :  "no") << endl;

	{
		// get /obj/foo
		object o = v.get<object>()["obj"].get<object>();
		cout << "/obj[\"foo\"] is " << o["foo"].to_str() << endl;

		// each object
		// get /obj/*
		object::iterator it;
		for (it = o.begin(); it != o.end(); it++) {
			cout << "/obj/" << it->first << " is " << it->second.to_str() << endl;
		}
	}

	{
		// get /arr[2]
		array a = v.get<object>()["arr"].get<array>();
		cout << "/arr[1] is " << a[1].get<double>() << endl;

		// each array
		// get /arr/*
		array::iterator it;
		int n = 0;
		for (it = a.begin(); it != a.end(); it++, n++) {
			cout << "/arr[" << n << "] is " << it->to_str() << endl;
		}
	}
	return 0;
}
/*
root is error? : no
root is object?: yes
root is array? : no
/obj["foo"] is bar
/obj/bar is baz
/obj/foo is bar
/arr[1] is 2
/arr[0] is 1.000000
/arr[1] is 2.000000
/arr[2] is 3.000000
*/