Undefined reference to `vtable for TestTimer'

[MONTIN]

Hi all,

I try a QTimer in a console application with qtcreator
and it does not compile ! I get this message "undefined reference to `vtable for TestTimer'"
Here is my code:

@#include <QCoreApplication>
#include <QTimer>
#include <Qdebug> // pourquoi ??

#include <stdio.h> // Pour printf

//**************************************************
class TestTimer : public QObject
{
Q_OBJECT //Macro qui sert à ddeclarer et connecter les signals et slots
// à mettre toujours meme si c'est superflu

public:
TestTimer(void) ;
~TestTimer(void);

public:
    int Seconde;
    QTimer *Timer;


public slots:
    void EveilTimer(void);

};

void TestTimer::EveilTimer(void)
{
Seconde++;
printf("Seconde=%d\n",Seconde);
}

TestTimer::TestTimer(void)
{
Timer = new QTimer(this);
connect (Timer,SIGNAL( timeout() ),this, SLOT( TestTimer::EveilTimer() ) );
Timer->start(1000);
}

TestTimer::~TestTimer(void)
{
Timer->stop();
delete Timer ;
}
//****************************************************
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

TestTimer MonTimer;

return a.exec();

}

and my project
QT += core
QT -= gui
TARGET = TestTimer
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp

Thanks for your help

Montin

[MONTIN]

Here is the code with the good syntax. I'm sorry
.

@#include <QCoreApplication>
#include <QTimer>
#include <Qdebug> // pourquoi ??

#include <stdio.h> // Pour printf

//**************************************************
class TestTimer : public QObject
{
Q_OBJECT //Macro qui sert à declarer et connecter les signals et slots
// à mettre toujours meme si c'est superflu

public:
TestTimer(void) ;
~TestTimer(void);

public:
    int Seconde;
    QTimer *Timer;


public slots:
    void EveilTimer(void);

};

void TestTimer::EveilTimer(void)
{
Seconde++;
printf("Seconde=%d\n",Seconde);
}

TestTimer::TestTimer(void)
{
Seconde = 0;
Timer = new QTimer(this);
connect (Timer,SIGNAL( timeout() ),this, SLOT( TestTimer::EveilTimer() ) );
Timer->start(1000);
}

TestTimer::~TestTimer(void)
{
Timer->stop();
delete Timer ;
}
//****************************************************
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

TestTimer MonTimer;

return a.exec();

}
@

[sierdzio]

You probably forgot to include the header in your main file:
@
#include "testtimer.h"
@

Also, QObjects require the implementation to be in a separate file .cpp file (well, sort of. If you want to avoid problems, better stick to it :)).

[SGaist]

Hi,

To add to sierdzio, if you add/remove Q_OBJECT you need to run qmake again before building

[MONTIN]

It works if i have three files
-TestTimer.h with the definition of the class
_TestTimer.cpp with the code of the function in the class

• main.cpp to invoqke the functions

But i did not change anything else.

Who can explain ??
Thanks

[MONTIN]

Here is the code with the good syntax. I'm sorry
.

@#include <QCoreApplication>
#include <QTimer>
#include <Qdebug> // pourquoi ??

#include <stdio.h> // Pour printf

//**************************************************
class TestTimer : public QObject
{
Q_OBJECT //Macro qui sert à declarer et connecter les signals et slots
// à mettre toujours meme si c'est superflu

public:
TestTimer(void) ;
~TestTimer(void);

public:
    int Seconde;
    QTimer *Timer;


public slots:
    void EveilTimer(void);

};

void TestTimer::EveilTimer(void)
{
Seconde++;
printf("Seconde=%d\n",Seconde);
}

TestTimer::TestTimer(void)
{
Seconde = 0;
Timer = new QTimer(this);
connect (Timer,SIGNAL( timeout() ),this, SLOT( TestTimer::EveilTimer() ) );
Timer->start(1000);
}

TestTimer::~TestTimer(void)
{
Timer->stop();
delete Timer ;
}
//****************************************************
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

TestTimer MonTimer;

return a.exec();

}
@

[MONTIN]

Here is the code with the good syntax. I'm sorry
.

@#include <QCoreApplication>
#include <QTimer>
#include <Qdebug> // pourquoi ??

#include <stdio.h> // Pour printf

//**************************************************
class TestTimer : public QObject
{
Q_OBJECT //Macro qui sert à declarer et connecter les signals et slots
// à mettre toujours meme si c'est superflu

public:
TestTimer(void) ;
~TestTimer(void);

public:
    int Seconde;
    QTimer *Timer;


public slots:
    void EveilTimer(void);

};

void TestTimer::EveilTimer(void)
{
Seconde++;
printf("Seconde=%d\n",Seconde);
}

TestTimer::TestTimer(void)
{
Seconde = 0;
Timer = new QTimer(this);
connect (Timer,SIGNAL( timeout() ),this, SLOT( TestTimer::EveilTimer() ) );
Timer->start(1000);
}

TestTimer::~TestTimer(void)
{
Timer->stop();
delete Timer ;
}
//****************************************************
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

TestTimer MonTimer;

return a.exec();

}
@

[MONTIN]

OK and thanks a lot. I did not knew that QOject required to be in a separated file and that running qmake first is better.

My problem seems to be solved.

[sierdzio]

Building of Qt applications includes not only invoking the compiler, but also several code generation tools (moc, uic, rcc). Those expect your code to follow certain conventions.

[MONTIN]

Thanks you two.
I will not forget ! I have copied and stuck your answers as a comment in my code !! Now I am sure I will find others mistakes to do !!

[SGaist]

Better avoid them, you'll have more time to code :)

Happy coding !