#include <QApplication> undefined reference to vtable

[sylvarant]

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

/***************************************************************************
 *   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;
 
 };

/***************************************************************************
 *   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;

 };

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[jpn]

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.

[sylvarant]

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.

[sunil.thaha]

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

[Tux-Slack]

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

just run:
make distclean
qmake
make