cppson

cpp json utility.

korean

Setup

just add a 'src/cppson.hpp' file to your project.

Branch

v-1.0 : A zero-dependency version which uses its own parsing system (inefficient, slow, unstable).
jsoncpp-compatible : use jsoncpp to parse json file. recommand to use this version.

Requirement

Visual studio 2013 +

mapping

json	C++
integer	int
real number	float, double
bool	bool
string	std::string
array	std::vector
object	JSON_CLASS

How to use

JSON_CLASS(className) macro that creates a class mapped to json file.
FIELD(type, fieldName) macro that creates a field mapped to json key - value pair. member created by FIELD macro has below methods:

isNull : whether the field has a value or not.
get : return that field's inner value.
operator -> : if that field's inner value type is class or structure, using operator -> to access inner value's member.

field type is compatible with that field's inner value type.

and, call loadFile function(jsonClass.loadFile), automatically mapped json file to that class.

parse vector from json file, use cppson::loadFile function.

See the example below.

Example

#include "cppson.hpp"

JSON_CLASS(Test)
{
public:
	FIELD(int, field1);
	FIELD(int, field2);
	FIELD(std::vector<int>, field3);
};

int main()
{
	Test t;
	
	//call loadFile, json file data mapped to class member variable.
	if(t.loadFile("test.json"))
	{
		printf("%d %d %d\n", t.field1, t.field2); //1 2
		printf("%d\n", t.field3->size()); //0
	}
	else
	{
		printf("parse failed.\n");
	}

	std::vector<int> vi;

	if(cppson::loadFile("test2.json"))
	{
		//1, 2, 3, 4, 5, 10
		for(auto i : vi)
		{
			printf("%d ", i);
		}
	}
	
	return 0;
}

//test.json
{
	"field1" : 1,
	"field2" : 2,
	"field3" : []
}

//test2.json
[
	1, 2, 3, 4, 5, 10
]

jwvg0425 / cppson