Undefined reference to vtable error

nanoandrew4

I was building a program as I usually do, but for some reason, I can't get beyond this error. Here is my code:
http://pastebin.com/YfKc0McZ - Player.h
http://pastebin.com/Ucm0uByn - Player.cpp

Any ideas on why this happens?

mrjj

ahh, add Q_OBJECT to your object ?

like
class MainWindow : public QMainWindow
{
Q_OBJECT
..

then clean and rebuild all.

nanoandrew4

@mrjj Thanks for the quick answer! I don't recall needing that, but when I add it, the whole thing gets worse with it complaining about protected classes and such.
EDIT: In my previous game, it was exactly like that and there was no problem

SGaist

Hi,

When adding/removing Q_OBJECT you need to re-run qmake before building, or do a full clean build.

nanoandrew4

@SGaist I have been trying that several times now, clean all, run qmake and build, but it still outputs the same thing. Thanks for the suggestion tho!

hskoglund

Hi, you get the vtable error because you're declaring keyPressEvent in your Player class, and that method is from QWidget. So either you also inherit from QWidget or move that method to some other class that also inherits from QWidget...

SGaist

To add to @hskoglund you have QGraphicsObject if you need QObject features

nanoandrew4

@hskoglund By inhereting from QWidget I get the same error 3 times. Also, my last project inherited from QGraphicsPixmapItem and had no problem when the code was like this. Any ideas why?

mrjj

sorry my bad, I read it as QWidget.
Not sure you need Q_OBJECT for QGraphicsRectItem

nanoandrew4

Deleted the project, ran it on the laptop and everything seems fine now... I will look into it to see what the issue was, maybe there is something missing somewhere