[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 ;-)