[solved] Passing QVector between forms

[KeineAhnung]

Hi there,

my program is slowly growing and I start getting into problems manage the user input. To structure the program I started to create new windows for special task. So far I managed to communicate between the windows using signals and slots but now I am looking for a method to have a QVector available in several windows.
I already created a support file with functions I need in several forms:
support.h

#ifndef SUPPORT_H
#define SUPPORT_H
 
#include <QDateTime>
 
namespace support {
 
    int w20();
    int w6();
 
}
#endif // SUPPORT_H

#ifndef SUPPORT_H
#define SUPPORT_H

#include <QDateTime>

namespace support {

    int w20();
    int w6();

}
#endif // SUPPORT_H

To copy to clipboard, switch view to plain text mode 

If I declare the QVector, from a custom class, here, would it be available in all forms that include the support file?

Thanks for looking into this!

[Lesiok]

But what is your problem ? So really asking the question: how to pass a value between two objects or how to make variable global. These are the basics of C++ and have nothing to do with Qt.

[KeineAhnung]

Hi Lesiok,

currently I do not have a problem. I wanted to ask first before I make major changes to my code. I think I want to declare a global variable. Thanks for the hint in the right direction.

[Lesiok]

OK, remember that Qt is nothing like an ordinary C++ library.

[KeineAhnung]

I got it to work by created a new file called global:

#ifndef GLOBAL_H
#define GLOBAL_H
 
#include "card.h"
 
extern QVector<Card> cards;
extern int cardIndex;
 
#endif // GLOBAL_H

#ifndef GLOBAL_H
#define GLOBAL_H

#include "card.h"

extern QVector<Card> cards;
extern int cardIndex;

#endif // GLOBAL_H

To copy to clipboard, switch view to plain text mode 

and the .cpp

#include "global.h"
 
// Global Variables
int cardIndex = 0;
QVector<Card> cards;

#include "global.h"

// Global Variables
int cardIndex = 0;
QVector<Card> cards;

To copy to clipboard, switch view to plain text mode 

Why do I have to declare the QVector again in the cpp file?