QObject, properties

[Archa4]

I want to ask:
i created and object type class name Movie:

#ifndef MOVIE_H
#define MOVIE_H
 
#include <QObject>
 
QT_BEGIN_NAMESPACE
class QLabel;
QT_END_NAMESPACE
 
class Movie : public QObject
{
    Q_OBJECT
public:
    Movie(QObject *parent = 0);
    ~Movie();
public slots:
    QString name()
        {return _name;}
    void setName(QString name_in)
        {_name = name_in;}
 
    QString date()
        {return _date;}
    void setDate(QString date_in)
        {_date = date_in;}
 
    QString about()
        {return _about;}
    void setAbout(QString about_in)
        {_about = about_in;}
 
    QString picture()
        {return _picture;}
    void setPicture(QString picture_in)
        {_picture = picture_in;}
 
private:
    QString _name;
    QString _date;
    QString _about;
    QString _picture;
};
 
#endif // MOVIE_H

#ifndef MOVIE_H
#define MOVIE_H

#include <QObject>

QT_BEGIN_NAMESPACE
class QLabel;
QT_END_NAMESPACE

class Movie : public QObject
{
    Q_OBJECT
public:
    Movie(QObject *parent = 0);
    ~Movie();
public slots:
    QString name()
        {return _name;}
    void setName(QString name_in)
        {_name = name_in;}

    QString date()
        {return _date;}
    void setDate(QString date_in)
        {_date = date_in;}

    QString about()
        {return _about;}
    void setAbout(QString about_in)
        {_about = about_in;}

    QString picture()
        {return _picture;}
    void setPicture(QString picture_in)
        {_picture = picture_in;}

private:
    QString _name;
    QString _date;
    QString _about;
    QString _picture;
};

#endif // MOVIE_H

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In mine main application i Use the following code:

QObject *asd = new Movie;
asd->setName(titleString);

QObject *asd = new Movie;
asd->setName(titleString);

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I get the following error:
'class QObject' has no member named 'setName'

What am I doing wrong?

[agarny]

On line 16, why do you have public slots:? Shouldn't it simply be public?

[FelixB]

What am I doing wrong?

you're calling setName() on a QObject. QObject does not have a member called "setName()"

[Archa4]

I found the problem - when i used
QObject *asd = new Movie;
i should really had to use:
Movie *asd = new Movie;

Now i have another problem:
i try to make QVector<Movie> movie_list, and it works
but when i try something like
movie_list.append(asd);

I get 4 errors and 20 warnings...
What am I doing wrong this time?

Well I solved this also.
I needed to make the QVector like this:
QVector<Movie *>;

[wysota]

QVector requires its content to be copyable which is not true for QObject derivatives. That's why you need to use pointers which can be copied.

[Archa4]

Then I need to ask another thing related to objects:
I need to make few of those and then pass QVector of them to another function. What should I do to prevent information loss? (objects are being created inside a cycle, and after it ends i think the information disappears, or does it)?

[wysota]

All C++principles apply here.

By the way I don't see anything in your code that would justify making it a QObject. Is there a particular reason for it?

[Archa4]

Is there a better way to create something like object?

[wysota]

You can implement a class that is not derived fro QObject. Inheriting QObject makes sense if the class is to benefit from the meta-object system (e.g. it has signals or slots). Your class seems to be a regular data carrier.