Call a class from a different source file

Konstantinos

void classone::classtwo(void) in the abc.cpp file

in def.cpp file, I want to connect the myaction with the classtwo.

connect(myaction,SIGNAL(triggered())...

What exactly I have to write?

thanks in advance.

VRonin

http://www.learncpp.com/cpp-tutorial/19-header-files/

Konstantinos

In def.cpp file there is one line:

#include "abc.h"

and the classtwo is a public slot.

If I write:

connect(myaction,SIGNAL(triggered()),this,SLOT(classtwo(void)));

It says: Object::connect: No such slot ...::classtwo(void) in ..def.cpp

I want it to search not in def.cpp but in abc.cpp

This is what I am asking. What I have to change.

VRonin

what type is myaction and what type is *this?

Konstantinos

QAction* myaction

But I think I have to find a way to call a function in another source file. Something I have to put instead of this.

For example

connect(myaction,SIGNAL(triggered()),void classone::classtwo(void),SLOT(classtwo(void)));

it does not work.

VRonin

you need a pointer to an instance of classone. can you post the full content of abc.h, def.cpp and wherever you are calling connect from?

Konstantinos

It is difficult to post all the code. But can you tell me more details about a pointer to an instance of classone? I think I have to do something like this.

VRonin

http://doc.qt.io/qt-4.8/signalsandslots.html#a-small-example

Konstantinos

Thanks. This is what I am talking about. In abc.h:

public slots:

void classtwo(void)

How can I call this public slot, not from abc.cpp, but from another .cpp file, for example from def.cpp?

mrjj

To connect, you need two live objects.
So you need to create one. (at least )
somewhere in def.cpp

OtherClass * oc= new OtherClass(this);

then
connect(this (the def class), (def)signal, oc , theslot (in OtherClass ) )

and check you have
Q_OBJECT
in the OtherClass

Konstantinos

Thank you mrjj. This was exactly what I did want.