Question

I’ve read the FAQ and several other websites about this, but I can’t seem to find the proper solution. I’m quite sure you’ve heard the question before, and I’d like to ask for specific help as to how I should solve this, if possible.

The specific error is:
error: undefined reference to `vtable for FGui’
It always points to the constructor in fgui.cpp, but I don’t see anything that could be wrong with it.

FGui is a class inherited from a class named “FFoo”, which is inherited from QMainWindow.
Relevant code:

(In ffoo.h:)

class Ffoo : public QMainWindow
{
Q_OBJECT
public:
    Ffoo();
    ~Ffoo();
    (...)
};

(In ffoo.cpp:)

Ffoo::Ffoo()
{
    textEdit = 0;
    tcpSock = 0;
    setupConnectBox();
}

Ffoo::~Ffoo()
{}

The FGui files are still very plain, since I only started making the class recently.

(fgui.h:)

class FGui : public Ffoo
{
    Q_OBJECT
public:
    FGui();
    ~FGui();
};

(fgui.cpp:)

FGui::FGui() : Ffoo()
{}

FGui::~FGui()
{}

If anybody can tell me what to do to solve this, I would be very grateful. Thanks in advance. 🙂

Answer 1

You need to moc your FGui and Ffoo classes.