JSON实战之savegame(Qt Example)

character.h

#include <QJsonObject>

class Character {
public:
    enum ClassType {
        Warrior, Mage, Archer
    };

    Character();
    Character(const QString &name, int level, ClassType classType);

    QString name() const;
    void setName(const QString &name);

    int level() const;
    void setLevel(int level);

    ClassType classType() const;
    void setClassType(ClassType classType);

    void read(const QJsonObject &json);
    void write(QJsonObject &json) const;

private:
    QString mName;
    int mLevel;
    ClassType mClassType;
};

character.cpp

#include "character.h"


Character::Character() :
    mLevel(0),
    mClassType(Warrior) {
}

Character::Character(const QString &name, int level, Character::ClassType classType) :
    mName(name),
    mLevel(level),
    mClassType(classType)
{
}

QString Character::name() const
{
    return mName;
}

void Character::setName(const QString &name)
{
    mName = name;
}

int Character::level() const
{
    return mLevel;
}

void Character::setLevel(int level)
{
    mLevel = level;
}

Character::ClassType Character::classType() const
{
    return mClassType;
}

void Character::setClassType(Character::ClassType classType)
{
    mClassType = classType;
}

void Character::read(const QJsonObject &json)
{
    mName = json["name"].toString(); mLevel = json["level"].toDouble(); mClassType = ClassType(qRound(json["classType"].toDouble())); } void Character::write(QJsonObject &json) const { json["name"] = mName; json["level"] = mLevel; json["classType"] = mClassType; } 

game.h

#include <QJsonObject>

#include "character.h"
#include "level.h"

class Game {
public:
    Game();

    enum SaveFormat {
        Json, Binary
    };

    const Character &player() const;
    const QList<Level> &levels() const;

    void newGame();
    bool loadGame(SaveFormat saveFormat);
    bool saveGame(SaveFormat saveFormat) const;

    void read(const QJsonObject &json);
    void write(QJsonObject &json) const;
private:
    Character mPlayer;
    QList<Level> mLevels;
};

game.cpp

#include "game.h"

#include <QFile>
#include <QJsonArray>
#include <QJsonDocument>


Game::Game()
{
}

const Character &Game::player() const
{
    return mPlayer;
}

const QList<Level> &Game::levels() const {
    return mLevels;
}

void Game::newGame() {
    mPlayer = Character();
    mPlayer.setName(QStringLiteral("Hero"));
    mPlayer.setClassType(Character::Archer);
    mPlayer.setLevel(15);

    mLevels.clear();

    Level village;
    QList<Character> villageNpcs;
    villageNpcs.append(Character(QStringLiteral("Barry the Blacksmith"), 10, Character::Warrior));
    villageNpcs.append(Character(QStringLiteral("Terry the Trader"), 10, Character::Warrior));
    village.setNpcs(villageNpcs);
    mLevels.append(village);

    Level dungeon;
    QList<Character> dungeonNpcs;
    dungeonNpcs.append(Character(QStringLiteral("Eric the Evil"), 20, Character::Mage));
    dungeonNpcs.append(Character(QStringLiteral("Eric's Sidekick #1"), 5, Character::Warrior));
    dungeonNpcs.append(Character(QStringLiteral("Eric's Sidekick #2"), 5, Character::Warrior));
    dungeon.setNpcs(dungeonNpcs);
    mLevels.append(dungeon);
}

bool Game::loadGame(Game::SaveFormat saveFormat)
{
    QFile loadFile(saveFormat == Json
        ? QStringLiteral("save.json")
        : QStringLiteral("save.dat"));

    if (!loadFile.open(QIODevice::ReadOnly)) {
        qWarning("Couldn't open save file.");
        return false;
    }

    QByteArray saveData = loadFile.readAll();

    QJsonDocument loadDoc(saveFormat == Json
        ? QJsonDocument::fromJson(saveData)
        : QJsonDocument::fromBinaryData(saveData));

    read(loadDoc.object());

    return true;
}

bool Game::saveGame(Game::SaveFormat saveFormat) const
{
    QFile saveFile(saveFormat == Json
        ? QStringLiteral("save.json")
        : QStringLiteral("save.dat"));

    if (!saveFile.open(QIODevice::WriteOnly)) {
        qWarning("Couldn't open save file.");
        return false;
    }

    QJsonObject gameObject;
    write(gameObject);
    QJsonDocument saveDoc(gameObject);
    saveFile.write(saveFormat == Json
        ? saveDoc.toJson()
        : saveDoc.toBinaryData());

    return true;
}

void Game::read(const QJsonObject &json)
{
    mPlayer.read(json["player"].toObject()); mLevels.clear(); QJsonArray levelArray = json["levels"].toArray(); for (int levelIndex = 0; levelIndex < levelArray.size(); ++levelIndex) { QJsonObject levelObject = levelArray[levelIndex].toObject(); Level level; level.read(levelObject); mLevels.append(level); } } void Game::write(QJsonObject &json) const { QJsonObject playerObject; mPlayer.write(playerObject); json["player"] = playerObject; QJsonArray levelArray; foreach (const Level level, mLevels) { QJsonObject levelObject; level.write(levelObject); levelArray.append(levelObject); } json["levels"] = levelArray; } 

level.h

#include <QJsonObject>
#include <QList>

#include "character.h"

class Level {
public:
    Level();

    const QList<Character> &npcs() const;
    void setNpcs(const QList<Character> &npcs);

    void read(const QJsonObject &json);
    void write(QJsonObject &json) const;
private:
    QList<Character> mNpcs;
};

level.cpp

#include "level.h"

#include <QJsonArray>

Level::Level()
{

}

const QList<Character> &Level::npcs() const
{
    return mNpcs;
}

void Level::setNpcs(const QList<Character> &npcs)
{
    mNpcs = npcs;
}

void Level::read(const QJsonObject &json)
{
    mNpcs.clear();
    QJsonArray npcArray = json["npcs"].toArray();
    for (int npcIndex = 0; npcIndex < npcArray.size(); ++npcIndex) {
        QJsonObject npcObject = npcArray[npcIndex].toObject();
        Character npc;
        npc.read(npcObject);
        mNpcs.append(npc);
    }
}

void Level::write(QJsonObject &json) const
{
    QJsonArray npcArray;
    foreach (const Character npc, mNpcs) {
        QJsonObject npcObject;
        npc.write(npcObject);
        npcArray.append(npcObject);
    }
    json["npcs"] = npcArray;
}

main.cpp

#include <QCoreApplication>

#include <QJsonObject>
#include <QJsonDocument>
#include <QDebug>
#include <QJsonArray>

#include "game.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
   Game game;
   game.newGame();
   // Game is played; changes are made...

   if (!game.saveGame(Game::Json))
       return 1;

   if (!game.saveGame(Game::Binary))
       return 1;

   Game fromJsonGame;
   if (!fromJsonGame.loadGame(Game::Json))
       return 1;

   Game fromBinaryGame;
   if (!fromBinaryGame.loadGame(Game::Binary))
       return 1;

    return a.exec();
}