qt - QDatastream operator>> 用于 QList<Class*>

所以我为自定义类重载了 QDatastream 的 >> 和 中。这是一些示例代码。QDataStream & operator <<(QDataStream &dataStream, const Faction &rhs){ return rhs.write(dataStream);}QDataStream & operator >>(QDataStream &dataStream, Faction &rhs){ return rhs.read(dataStream);}QDataStream & operator <<(QDataStream &dataStream, const Faction *rhs){ return rhs->write(dataStream);}QDataStream & operator >>(QDataStream &dataStream, Faction *rhs){ rhs = new Faction(); return rhs->read(dataStream);}QDataStream & Faction::read(QDataStream &dataStream){ QString tag; dataStream >> tag; QString classTag = QString(typeid(this).name()); getTypeName(&classTag); if (tag == classTag + "Start") { while (tag != classTag + "End") { if (tag == "name") { dataStream >> name; // The name of the faction. } else if (tag == "buildings") { dataStream >> buildings; // The buildings of the Faction. } else if (tag == "units") { dataStream >> units; // The units of the Faction. } else if (tag == "upgrades") { dataStream >> upgrades; // The upgrades of the Faction. } else if (tag == "startBuildings") { dataStream >> startBuildings; // The list of buildings when starting a game. } else if (tag == "startUnits") { dataStream >> startUnits; // The list of units when starting a game. } else if (tag == "startUpgrades") { dataStream >> startUpgrades; // The list of upgrades when starting a game. } // Reading the next tag. dataStream >> tag; } } return dataStream;}QDataStream & Faction::write(QDataStream &dataStream) const{ QString classTag = QString(typeid(this).name()); getTypeName(&classTag); dataStream << QString(classTag + "Start"); dataStream << QString("name"); dataStream << name; // The name of the faction. dataStream << QString("buildings"); dataStream << buildings; // The buildings of the Faction. dataStream << QString("units"); dataStream << units; // The units of the Faction. dataStream << QString("upgrades"); dataStream << upgrades; // The upgrades of the Faction. dataStream << QString("startBuildings"); dataStream << startBuildings; // The list of buildings when starting a game. dataStream << QString("startUnits"); dataStream << startUnits; // The list of units when starting a game. dataStream << QString("startUpgrades"); dataStream << startUpgrades; // The list of upgrades when starting a game. dataStream << QString(classTag + "End"); return dataStream;}派系.h #ifndef FACTION_H #define FACTION_H #include <JECUtils.h> #include <Unit.h> #include <UnitBase.h> class Faction { public: explicit Faction(); explicit Faction(const QString& name); Faction(const Faction& faction); Faction& operator=(const Faction& rhs); bool operator==(const Faction& rhs) const; bool operator!=(const Faction& rhs) const; friend QDataStream &operator<<(QDataStream &dataStream, const Faction& rhs); friend QDataStream &operator>>(QDataStream &dataStream, Faction& rhs); friend QDataStream &operator<<(QDataStream &dataStream, const Faction* rhs); friend QDataStream &operator>>(QDataStream &dataStream, Faction* rhs); void addBuilding(UnitBase* building); void addUnit(UnitBase* unit); void addUpgrade(UnitBase* upgrade); const QString& getName() const; const UnitBase* getBuilding(const int& index) const; const QList<UnitBase*>& getBuildings() const; const UnitBase* getUnit(const int& index) const; const QList<UnitBase*>& getUnits() const; const UnitBase* getUpgrade(const int& index) const; const QList<UnitBase*>& getUpgrades() const; const QList<QList<Unit*> >* getStartUnits() const; const QList<QList<Unit*> >* getStartBuildings() const; const QList<QList<Unit*> >* getStartUpgrades() const; void initialize(const QStringList& globalActions); void removeAllBuilding(); void removeAllUnit(); void removeAllUpgrade(); void removeBuilding(const int& index); void removeUnit(const int& index); void removeUpgrade(const int& index); void setStartUp(const QStringList& names, const QList<int>& quantities); protected: QDataStream& read(QDataStream &dataStream); QDataStream& write(QDataStream &dataStream) const; private: QString name; // The name of the faction. QList<UnitBase*> buildings; // The buildings of the Faction. QList<UnitBase*> units; // The units of the Faction. QList<UnitBase*> upgrades; // The upgrades of the Faction. QList<QList<Unit*> > startBuildings; // The list of buildings when starting a game. QList<QList<Unit*> > startUnits; // The list of units when starting a game. QList<QList<Unit*> > startUpgrades; // The list of upgrades when starting a game.};#endif // FACTION_H所以在这个特定的例子中，我有一个 QList。当代码dataStream >> factions运行时，应该读入 Faction* 的整个 QList。但是我得到了垃圾。QDataStream & operator >>(QDataStream &dataStream, Faction *rhs){ rhs = new Faction(); return rhs->read(dataStream); <---- rhs will return good data.}rhs 包含从文件中读入的正确数据。但是，在读取了整个 QList 之后，QList 中存在垃圾值。谁能帮我吗？ 最佳答案 运算符 >> 需要一个引用作为其第二个参数，您也可以引用指针:QDataStream & operator >>(QDataStream &dataStream, Faction *&rhs){ rhs = new Faction(); return rhs->read(dataStream);}关于qt - QDatastream operator>> 用于 QList<Class*>，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/7381843/