Qt5.5中类反射试验

网络上下载的类：

#ifndef OBJECTFACTORY_H

#define OBJECTFACTORY_H

class ObjectFactory

{

public:

  template<typename T>

  static void registerClass()

  {

    constructors().insert( T::staticMetaObject.className(), &constructorHelper<T> );

  }

  static QObject* createObject( const QByteArray& className, QObject* parent = NULL )

  {

    Constructor constructor = constructors().value( className );

    if ( constructor == NULL )

      return NULL;

    return (*constructor)( parent );

  }

private:

  typedef QObject* (*Constructor)( QObject* parent );

  template<typename T>

  static QObject* constructorHelper( QObject* parent )

  {

    return new T( parent );

  }

  static QHash<QByteArray, Constructor>& constructors()

  {

    static QHash<QByteArray, Constructor> instance;

    return instance;

  }

};

#endif // OBJECTFACTORY_H

自己建立的测试类：

#ifndef CDXOBJECT_H

#define CDXOBJECT_H

#include <QObject>

#include "QString"

class CdxObject : public QObject

{

    Q_OBJECT

public:

    QString m_sName;

public:

    explicit CdxObject(QObject *parent = 0);

signals:

public slots:

};

class CdxDrawObject : public CdxObject

{

    Q_OBJECT

public:

    explicit CdxDrawObject(QObject* parent);

signals:

public slots:

};

class CdxNetworkObject : public CdxObject

{

    Q_OBJECT

public:

    explicit CdxNetworkObject(QObject* parent);

signals:

public slots:

};

#endif // CDXOBJECT_H

//cdxobject.cpp

#include "cdxobject.h"

CdxObject::CdxObject(QObject *parent) : QObject(parent)

{

    m_sName="root object";

}

CdxDrawObject::CdxDrawObject(QObject* parent)

{

    m_sName="draw object";

}

CdxNetworkObject::CdxNetworkObject(QObject* parent)

{

    m_sName="network object";

}

//调用测试

#include "cdxobject.h"

#include "objectfactory.h"

void MainWindow::on_pushButton_clicked()

{

    ObjectFactory::registerClass<CdxObject>();

    ObjectFactory::registerClass<CdxDrawObject>();

    ObjectFactory::registerClass<CdxNetworkObject>();

    //CdxObject* object = (CdxObject*)ObjectFactory::createObject( "CdxObject" );

    //CdxObject* object = (CdxObject*)ObjectFactory::createObject( "CdxDrawObject" );

    CdxObject* object = (CdxObject*)ObjectFactory::createObject( "CdxNetworkObject" );

    ui->lineEdit->setText(object->m_sName);

}