Saving Values from a Dialog to MainWindow - "cannot call member function w/o an objec

[Lykurg]

Hi that is basic OOP!
In Dialog:n_btnSend_clicked() you create a *new* instance of MainWindow which has no connect with the instance of MainWindow from which you execute the dialog. Again define getter functions in the dialog, and after the dialog is finished use them to alter the MainWindow. Have a second look at my example.

[mbergmann-sh]

didn't see you had already pointed to that failure. I'll give it a thought and try to rewrite that crap after overlooking your example. Thanks a lot!

[wysota]

I don't know what your dialog is supposed to be used and what its relation to MainWindow is but if what Lykurg suggested is somehow not an option for you (although it is the best solution possible), another solution would be to pass a pointer to MainWindow to the dialog. However, again, from OOP perspective, it is better to query a value from the dialog and set it on the main window from outside of the dialog.

[mbergmann-sh]

I'm writing on a small alarm watch app consisting of a main window showing times and allowing to start a predefined alarm time, and some user dialogs fpr setting up different alarm tunes (as mp3) and entering events to be shown on wake time. This so far is what I'm working on. Since I need to store the values of those Dialogs in the main window, I thought it as a good idea soing this in the MainWindow class private vars. I wanted to have them central, because of the need of writing them into a presets file and because they are njeeded by the main window in order to do its job. The example code above, however, is a simplified rewrite mirroring my problem - not the app I'm working on. Since I'm relatively new to C++ I expect more quirks and quarks to come there...

I worked myself through a German book titled "C++ in 21 Tagen", also through "The independant Qt tutorial" and the Blanchette Book on Qt, and I have some knowledge in C from my Amiga times.
Nevertheless, i see there's more needed to fully understand C++'ing with Qt. Some concepts still confuse me, since I'm still thinking in more procedural terms. Once after a while I hope it'll change to more OOP thinking, but I have to get used to it. Guess there's more practice to be done...
I'll start giving it a try with both possibilities in some test projects: handing a pointer to MainWindow and using getter functions. The last was what I thought I did, but obviously they are needed in the Dialog - and I implemented them in MainWindow.

Thanks a lot for all your hints! This seems to be a very friendly forum.