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picojsonを使ってoF環境設定ファイルを読み書き

Last updated at Posted at 2013-12-02

ofxXmlSettingが使いにくかったので、picojson使ってみました。

config.json
{
	"LV":3,
	"HP":1,
	"MP":1,
	"sleepy":false,
	"hungry":true,
	"status":"カレー食べたい"
}

こんな感じのjsonファイルを用意して、

testApp.cpp

//testapp.cpp

# include "ofUtils.h"
# include <fstream>
# include "picojson.h"

void setup() {
	// load from bin/data/config.json
	std::string path = ofToDataPath("config.json");
	std::ifstream file;
	file.open(path.c_str());

	if(file.fail()) {
		std::cout << "Failed to open file : " << path << std::endl;
		return;
	}

	// to std::string
	std::istreambuf_iterator<char> first(file);
	std::istreambuf_iterator<char> last;
	std::string json_str(first, last);

	// parse json
	picojson::value json;
	std::string err;
	picojson::parse(json, json_str.begin(), json_str.end(), &err);

	picojson::object &o = json.get<picojson::object>();

	int lv = (int) o["LV"].get<double>();
	bool hungry = o["hungry"].get<bool>();
	std::string status = o["status"].get<std::string>();
}


こんな感じ。落ち着いたらクラスにまとめたい。ofxPicojsonに。

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