[SOLVED] Getting Object name/type using moc

Paawan

Hi All,

Need some help in using meta functionality in Qt. I am probably going wrong in many places.

I have a Film Class. I have also derived (not sure if this is correct terminology) two more classes under Film, Educational and Entertainment which are sub-classes.

I have a FilmMap class which is sub-class of QMap<QSting, Film*>.

I have now written a third class FilmMapWriter which has write XML file of the FilmMap.

@
foreach (QString i, map1.keys()) {

   QVariant name = map1[i]->QObject->objectName();
    
   qDebug() << name.toString();
    qDebug()<< " In the FilmMapWriter class";

}

@

In the above code I am trying to get the type of the object. If it is Film, Entertainment or Educational.

But I am getting errors. Where am I going wrong?

Thanks

Paawan

I have changed the code to the following:

@
foreach (QString i, map1.keys()) {

   QString name = map1[i]->metaObject()->className();


   qDebug() << name;


    qDebug()<< " In the FilmMapWriter class";

}

@

Now it is working. But the problem now is that it is showing all classes as Film.

Not any of the sub-classes. Entertainment or Educational.

How do I get capture that information.

Thanks

jeremy_k

Do the subclasses also have Q_OBJECT macros?

Paawan

Hi,

I did not. Added it and now it work.

Thanks a lot for your time and assistance.

Paawan

Hi,

I now have another issue.

In the Film class I have declared 5 variables.

In the sub-classes I have declared 2 more variables in each sub-class.

For example in Film class I have declared a QString m_Director.

I can access that by the following statement:

@
map1[i]->m_Director

@

Now I have declared QString m_Subject in the sub-class Educational.

But when I use "->" I am not getting m_Subject option.

How do I get it?

Thanks again.

jeremy_k

It sounds like a general C++ inheritance tutorial such as http://www.cplusplus.com/doc/tutorial/inheritance/ will be a lot more useful than answers to individual questions.

For this particular question, the problem might be an access specifier issue, or using a pointer to the base type instead of the derived one. Without seeing the source, it's hard to tell.

Paawan

Managed to do it. Used the qobject_cast operator and I am getting the results.

Thanks for your time. Appreciated.