Using .json files

We can use the JSON format like the XML format for saving/loading game-related data. JSON is a simpler format than XML. It takes less space to represent the same data than the XML file format. Further, today, it is used as the value of Web API. Cocos2d-x has a JSON parse library called RapidJSON. In this recipe, we will explain how to use RapidJSON.

Getting ready

RapidJSON is usually included in Cocos2d-x. However, you need to include the header files as follows:

#include "json/rapidjson.h"
#include "json/document.h"

How to do it...

Firstly, we will parse a JSON string as follows:

std::string str = "{\"hello\" : \"word\"}";

You can parse JSON by using rapidjson::Document as follows:

rapidjson::Document d;
d.Parse<0>(str.c_str());
if (d.HasParseError()) { 
    CCLOG("GetParseError %s\n",d.GetParseError()); 
} else if (d.IsObject() && d.HasMember("hello")) { 
    CCLOG("%s\n", d["hello"].GetString()); 
}

How it works...

You can parse JSON by using the Document::Parse...