#include <QApplication> undefined reference to vtable

Hi all, I've just started using qt and I've run into the problem of constantly getting
undefined reference to 'vtable for window'
Witch is strange cause I was able to run some of the tutorial examples but this one just wont work.
I'm using Kdevelop 3.5 on ubuntu 7.04 and using qt4
window.h

Code:

---

/***************************************************************************
 *   Copyright (C) 2007 by adriaan,,,   *
 *   adriaan@Tornado   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
 
#pragma once
 
#include <QApplication>
#include <QtGui>
#include <QWidget>
#include <QComboBox>
#include <QLineEdit>
#include <QtGui>
#include <QGridLayout>
#include <QGroupBox>
#include <QPushButton>
#include <QLabel>
 
 
class window : public QWidget
{
 
 public:
 
	window(QWidget * parent = NULL);
 
	~window();
 
 private:
 
	QLineEdit * nameline;
 
	QLineEdit * typeline;
 
	QLineEdit * answerline;
 
 };

---

window.cpp

Code:

---

/***************************************************************************
 *   Copyright (C) 2007 by adriaan,,,   *
 *   adriaan@Tornado   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
 
 
#include "window.h"
 
window::window(QWidget * var) : QWidget(var)
{
 
	/*=================================================
	*	Settings					 *
	=================================================*/	
 
	setWindowTitle("Variable Definer Version 0.1");
 
	/*=================================================
	*	Name					 *
	=================================================*/			
 
	QGroupBox * namegroup = new QGroupBox("Name");
 
	QLabel * namelabel = new QLabel("Enter variable name:");
 
	nameline = new QLineEdit();
 
	nameline->setFocus();
 
	QGridLayout * namelayout = new QGridLayout;
 
	namelayout->addWidget(namelabel, 0, 0);
 
	namelayout->addWidget(nameline, 1, 0,1,2);
 
	namegroup->setLayout(namelayout);
 
	/*=================================================
	*	Type					  *
	=================================================*/	
 
	QGroupBox * typegroup = new QGroupBox("Type");
 
	QLabel * typeLabel = new QLabel("Enter variable type");
 
	typeline = new QLineEdit(); 
 
	QGridLayout * typelayout = new QGridLayout();
 
	typelayout->addWidget(typeLabel, 0, 0);
 
	typelayout->addWidget(typeline, 1,0,1,2);
 
	typegroup->setLayout(typelayout);
 
	/*=================================================
	*	Specifiers					 *
	=================================================*/
 
	QGroupBox * specgroup = new QGroupBox("Specifiers");
 
	QLabel * speclabel = new QLabel("Choose the right defenition");
 
	QPushButton * array = new QPushButton("Array (of)"); 
 
	QPushButton * pointer = new QPushButton("Pointer (to)");
 
	QPushButton * function = new QPushButton("Function");
 
	QGridLayout * speclay = new QGridLayout(); 
 
	speclay->addWidget(speclabel,0,0);
 
	speclay->addWidget(array,1,0); 
 
	speclay->addWidget(pointer,1,1);
 
	speclay->addWidget(function,1,2); 
 
	specgroup->setLayout(speclay);
 
	/*=================================================
	*	Answer					 *
	=================================================*/
 
	QGroupBox * answergroup = new QGroupBox("Defenition");
 
	QLabel * answerlabel = new QLabel("The correct defenition:");
 
	answerline = new QLineEdit();
 
	QGridLayout * anslay= new QGridLayout();  
 
	anslay->addWidget(answerlabel,0,0); 
 
	anslay->addWidget(answerline,1,0,1,2); 
 
	answergroup->setLayout(anslay);
 
	/*=================================================
	*	Global Layout				 *
	=================================================*/
 
	QGridLayout * layout = new QGridLayout();
 
	layout->addWidget(namegroup, 0, 0);
 
	layout->addWidget(typegroup, 1, 0);
 
	layout->addWidget(specgroup, 2, 0);
 
	layout->addWidget(answergroup,3, 0);
 
	setLayout(layout);
 
}

---

main.cpp

Code:

---

/***************************************************************************
 *   Copyright (C) 2007 by adriaan,,,   *
 *   adriaan@Tornado   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
 
 
#include <QApplication>
 
#include "window.h"
 
int main(int argc, char *argv[])
{
 
      	QApplication application (argc, argv);
 
	window * newwindow = new window();
 
	newwindow->show();
 
	return (application.exec());
 
}

---

Maybe it's just a copy-paste problem but I don't see a function body for ~window(). ;)

Oh damn, I did forget a destructor.
all this trouble for something this simple :p
thanx for pointing it out

I' ve encountered this problem once again while trying to create a signal and slot
and yes all functions are stated in window.cpp

window.h

Code:

---

/***************************************************************************
 *   Copyright (C) 2007 by adriaan,,,   *
 *   adriaan@Tornado   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
 
#pragma once
 
#include <QApplication>
#include <QtGui>
#include <QWidget>
#include <QObject>
#include <QComboBox>
#include <QLineEdit>
#include <QtGui>
#include <QGridLayout>
#include <QGroupBox>
#include <QPushButton>
#include <QLabel>
 
 
class window : public QWidget
{
 
	Q_OBJECT
 
 public:
 
	window(QWidget * parent = NULL);
 
	~window();
 
 
 public slots:
 
	void select(int choice);
 
 
 signals:
 
	void createanswer(int al);
 
 
 private:
 
	QLineEdit * nameline;
 
	QLineEdit * typeline;
 
	QLineEdit * answerline;
 
 };

---

Make sure window.h is listed in .pro file and then try re-running qmake. In general, you should always re-run qmake after adding Q_OBJECT macro so that required make rules for moc get generated.

It seems to be in there but no moc files are created when compiling and thats probably the problem but I have no idea of how to fix this.
It's probably something Kdevelop related.

if no moc files are created then, run a qmake. ( just a jpn had mentioned )

You need to rebuild your app from scratch.
I mean, recompile, not delete your work and start over :)

just run:
make distclean
qmake
make