Slot problems with QT, linker error

Question

Was wanting to ask about a linker error I keep getting. I installed QT and am using it on Visual Studio 2005. Basically whenever i try and declare a slot I get this linker error message.

Error 1 error LNK2019: unresolved external symbol "public: int __thiscall ipodGuiLoaderQT::hello(void)" (?hello@ipodGuiLoaderQT@@QAEHXZ) referenced in function "public: virtual int __thiscall ipodGuiLoaderQT::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@ipodGuiLoaderQT@@UAEHW4Call@QMetaObject@@HPAPAX@Z) moc_ipodguiloaderqt.obj

This usually suggests that I haven't included the correct header file. But I should have. Here's my code so far.

#ifndef IPODGUILOADERQT_H
#define IPODGUILOADERQT_H

#include <QtGui/QMainWindow>
#include <QtGui/QAction>
#include <QObject>
#include "ui_ipodguiloaderqt.h"


class ipodGuiLoaderQT : public QMainWindow
{
    Q_OBJECT

public:
    ipodGuiLoaderQT(QWidget *parent = 0, Qt::WFlags flags = 0);
    ~ipodGuiLoaderQT();

private:
    Ui::ipodGuiLoaderQTClass ui;

    QAction* blah;

    public slots:
        int hello();


};

#endif // IPODGUILOADERQT_H

Any help would be appreciated.

It's a linker error, so it's not a header problem. Did you implement that slot somewhere? (Make sure you try a clean build too.) — Mat, Nov 04 '11 at 14:42
yeah supreme stupidity! Sorry for wasting time! Forgot to implement it in cpp. — Bushes, Nov 04 '11 at 14:53

score 1 · Accepted Answer · answered Nov 04 '11 at 14:42

Error 1 error LNK2019: unresolved external symbol "public: int __thiscall ipodGuiLoaderQT::hello(void)"

The linker is clearly saying you that it couldn't find which is the definition of ipodGuiLoaderQT::hello(void). What you have as a part of the class ipodGuiLoaderQT is just the declaration and check whether you have provided it's implementation (i.e., definition) in the corresponding source file and compiled it too.

Slot problems with QT, linker error

1 Answers1