[SOLVED] Inheriting virtual slots and use the new QT5 connect flavour

jensen82

Hi!

If i create a class from a base class with virtual slots, the slots never get called with the new connect-flavour.
If i use the old connect-syntax, the slot gets called. What could be the problem?

@
class BaseClass: public QObject
{
public slots:

virtual void Slot1() = 0;
virtual void Slot2() = 0;

};

class DerivedClass: public BaseClass
{

public slots:

void Slot1();
void Slot2();

};
@

Why doesn't it work with the new connect-syntax but does with the old syntax?

Thank you very much!

dheerendra

I have tried just now as well.Hope you are taking about the following new syntax It works fine.
QObject::connect(&button,&QPushButton::clicked,&dobj,&DerivedClass::vslot2);

I tried on Windows.

jensen82

Hm...did you declare it as a pure virtual in the baseclass? Doesn't work here. Maybe the problem is that i connect to a slot of a class in dll-library.

dheerendra

It is same class as yours. I have added one more slot in base class. Dll also should not cause any issue.

@class BaseClass : public QObject
{
Q_OBJECT
public:
explicit BaseClass(QObject *parent = 0);

signals:

public slots:
void vslot0();
virtual void vslot1() =0;
virtual void vslot2() =0;
};

class DerivedClass : public BaseClass
{
Q_OBJECT
public:
explicit DerivedClass();

signals:

public slots:
void vslot1();
void vslot2();
};@

jensen82

I have my base in dll1 and my derivec in dll2. If i send the signal that connects with the slot of base-class, the slot in derived is never called.

Did you try it with dlls?

dheerendra

I have not tried with dlls. Did you create plugin or is it plain dll ? Hope you have exported the functions in dll with extern "C" to avoid any name mangling issues.

jensen82

Hi! I'm exporting the class. Is it required to export the DerivedClass? Or is it required to export the class and every method/function?

Thank you for your help.

jensen82

Works. Did a complete rebuild. Take care of Q_DECL_EXPORT ;-)