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();}