QT Project crashes when attempting signal slot connect()

[SOrton]

Hi,

Im struggling to find why my signal causes my program to completely crash.
I am sending from a dialog to my main wondow (class->class)
reciever header file:

Receiver (slot) function + function that creates the child dialog:

sender header file:

sender cpp file (including connect() func):

Would greatly apreciate if anyone can figure this out.

[JonB]

@SOrton
It's a lot easier for people to reply if you paste your code as text not as screenshots.

In AddDataDialog:

MainWindow *test = new MainWindow;
connect(..., test, ...);

You are creating a brand new MainWindow here, in your dialog. This is conceptually wrong.

If this were to work at all you would need the instance of MainWindow to pass as parameter. But don't try to do the connection from the dialog anyway. Do it from MainWindow. Either export a getter returning ui->btn_Exit or emit a new signal from AddDataDialog for the button being clicked/exiting and connect that. Either way connect() back in MainWindow. You wouldn't need a signal if you show the dialog modally, but maybe that's not your case.

[jsulm]

@SOrton Please post code as text, not pictures!
Where exactly (in which line) does it crash?

Why does AddDataDialog create a new MainWindow instead of using the existing one?

[JonB]

@SOrton
It's a lot easier for people to reply if you paste your code as text not as screenshots.

In AddDataDialog:

MainWindow *test = new MainWindow;
connect(..., test, ...);

You are creating a brand new MainWindow here, in your dialog. This is conceptually wrong.

If this were to work at all you would need the instance of MainWindow to pass as parameter. But don't try to do the connection from the dialog anyway. Do it from MainWindow. Either export a getter returning ui->btn_Exit or emit a new signal from AddDataDialog for the button being clicked/exiting and connect that. Either way connect() back in MainWindow. You wouldn't need a signal if you show the dialog modally, but maybe that's not your case.