Problems with Q_OBJECT and subclassing

Hi all, using Qt 3.3.4 free X11 on Fedora Core 4 Linux (i386).

Trying to create a custom widget like so:

Class declaration as follows

Code:

---

// declaration (CGLFrame.h)
#ifndef CGLFRAME_H
#define CGLFRAME_H
 
#include "GLee.h"
#include <qgl.h>
#include <qframe.h>
#include <qpaintdevice.h>
#include <qapplication.h>
#include <qevent.h>
#include <qmessagebox.h>
#include <qstring.h>
#include <qfileinfo.h>
#include <qtimer.h>
 
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
 
class CGLFrame : public QFrame
{	
	Q_OBJECT
 
public:	
	CGLFrame(QWidget * parent = 0, const char * name = 0);		
	virtual ~CGLFrame();
	virtual void InitGLScene();
	virtual void ResizeGLScene();
	virtual void RenderGLScene(int pick);
	virtual void KillGLScene();
	virtual void InitGLSL();
	virtual void CheckGLError();
 
private:
	//	enum PickMode { PickNone, PickWidget };
	int m_iPickMode;
	QGLContext * m_cContext;
	QTimer	timerGL;
	char * readShaderFile(const char * filename);
	virtual void mousePressEvent(QMouseEvent * event);
	virtual void mouseReleaseEvent(QMouseEvent * event);
	virtual void mouseMoveEvent(QMouseEvent * event);
	virtual void resizeEvent(QResizeEvent * event);
	virtual void paintEvent(QPaintEvent * event);
	virtual void showEvent(QShowEvent * event);
	virtual void info(const char * title, const char * msg, ...);
 
public slots:
	void timerGLFire();	
};
#endif

---

and class implementation as follows:

Code:

---

#include "CGLFrame.h"
 
CGLFrame::CGLFrame(QWidget * parent, const char * name)
				: QFrame(parent, name),
				m_iPickMode(0),
				m_cContext(0)
{
	QGLFormat format;
	m_cContext = new QGLContext(format, (QPaintDevice *)this);
	m_cContext->create();
 
	InitGLScene();
}
 
void CGLFrame::CheckGLError()
{
	int err;
	if ((err = glGetError()) != GL_NO_ERROR) 
	{
		QString s = QString((char *)gluErrorString(err));
		info("GL error!", "%s\n", s.data());
	}	
}
 
void CGLFrame::info(const char * title, const char * msg, ...)
{
	... format message
	QMessageBox::information(0, title, text);
}
 
void CGLFrame::InitGLScene()
{
	m_cContext->makeCurrent();
 
	//	initialize GLSL
	InitGLSL();
 
	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	glClearDepth(1.0f);
	ResizeGLScene();
 
	connect(&timerGL, SIGNAL(timeout()), this, SLOT(timerGLFire()));
	timerGL.start(0, FALSE);	
}
 
void CGLFrame::InitGLSL()
{
    ... init GLSL
}
 
char * CGLFrame::readShaderFile(const char * filename)
{
    ... read shader file
}
 
void CGLFrame::ResizeGLScene()
{
	m_cContext->makeCurrent();
	glViewport(0, 0, width(), height()); 
 
	glMatrixMode(GL_PROJECTION); 
	glLoadIdentity(); 
 
	glOrtho(-10.0, 10.0, 0.0, 10.0, -10.0, 10.0); 
 
	glMatrixMode(GL_MODELVIEW); 
	glLoadIdentity();		
 
}
 
void CGLFrame::RenderGLScene(int pick)
{
	m_cContext->makeCurrent();
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glFlush();
 
	if(m_cContext->format().doubleBuffer())
		m_cContext->swapBuffers();
}
 
void CGLFrame::KillGLScene()
{
	timerGL.stop();
	delete m_cContext;
	return;
}
 
 
void CGLFrame::mousePressEvent(QMouseEvent * event)
{
	int mx = event->x();
	int my = event->y();
}
 
void CGLFrame::mouseReleaseEvent(QMouseEvent * event)
{
	int mx = event->x();
	int my = event->y();
}
 
void CGLFrame::mouseMoveEvent(QMouseEvent * event)
{
	int mx = event->x();
	int my = event->y();
}
 
void CGLFrame::resizeEvent(QResizeEvent * event)
{
	ResizeGLScene();
}
 
void CGLFrame::paintEvent(QPaintEvent * event)
{
}
 
void CGLFrame::timerGLFire()
{
	RenderGLScene(m_iPickMode);
}
 
void CGLFrame::showEvent(QShowEvent * event)
{
 
}
 
CGLFrame::~CGLFrame()
{
	KillGLScene();
}

---

and in my ui.h:

Code:

---

#include "CGLFrame.h"
 
CGLFrame * cGLFrame2DLUT = 0;
 
void CFormControls::init()
{
    cGLFrame2DLUT = new CGLFrame( tab2DLUT, "cGLFrame2DLUT" );
    cGLFrame2DLUT->setGeometry( QRect( 20, 20, 256, 256 ) );
}

---

When I compile, here's my problem:

g++ -c -pipe -Wall -W -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -DQT_NO_DEBUG -DQT_SHARED -DQT_THREAD_SUPPORT -I/usr/lib/qt-3.3/mkspecs/default -I. -I/usr/lib/qt-3.3/include -I/usr/X11R6/include -I/usr/X11R6/include -I.ui/ -I. -I.moc/ -o .obj/CGLFrame.o CGLFrame.cpp
/usr/lib/qt-3.3/include/qnamespace.h:835: error: expected identifier before numeric constant
/usr/lib/qt-3.3/include/qnamespace.h:835: error: expected unqualified-id before numeric constant
/usr/lib/qt-3.3/include/qevent.h:61: error: expected identifier before numeric constant
/usr/lib/qt-3.3/include/qevent.h:61: error: expected `}' before numeric constant
/usr/lib/qt-3.3/include/qevent.h:61: error: expected unqualified-id before numeric constant
/usr/lib/qt-3.3/include/qevent.h:142: error: expected `)' before ‘type’
/usr/lib/qt-3.3/include/qevent.h:143: error: declaration of ‘~QEvent’ as non-member
/usr/lib/qt-3.3/include/qevent.h:144: error: ‘Type’ does not name a type
/usr/lib/qt-3.3/include/qevent.h:145: error: non-member function ‘bool spontaneous()’ cannot have cv-qualifier
/usr/lib/qt-3.3/include/qevent.h: In function ‘bool spontaneous()’:
/usr/lib/qt-3.3/include/qevent.h:145: error: ‘spont’ was not declared in this scope
/usr/lib/qt-3.3/include/qevent.h: At global scope:
/usr/lib/qt-3.3/include/qevent.h:146: error: expected unqualified-id before ‘protected’
/usr/lib/qt-3.3/include/qevent.h:148: error: expected unqualified-id before ‘private’
/usr/lib/qt-3.3/include/qevent.h:150: error: invalid function declaration
/usr/lib/qt-3.3/include/qevent.h:153: error: ‘friend’ can only be specified inside a class
/usr/lib/qt-3.3/include/qevent.h:154: error: ‘friend’ can only be specified inside a class
/usr/lib/qt-3.3/include/qevent.h:155: error: ‘friend’ can only be specified inside a class
/usr/lib/qt-3.3/include/qevent.h:156: error: ‘friend’ can only be specified inside a class
/usr/lib/qt-3.3/include/qevent.h:157: error: expected declaration before ‘}’ token
make: *** [.obj/CGLFrame.o] Error 1

Now, why the heck is my custom widget even affecting qnamespace.h & qevent.h? Why do my errors stop happening when I take the Q_OBJECT macro out of the class declaration? I'd just leave it out, but I need to have a slot for my timer!

Any ideas? Many thanks in advance! :)

I don't know Qt 3 but it looks like you are missing the header with the Q_OBJECT definition. The (internal?) header qobjectdefs.h is not included by any of your includes.

Try moving this:

Code:

---

#include "GLee.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>

---

to .cpp file (place it after #include "CGLFrame.h").

Hi Codepoet, no change, I think <qobjectdefs.h> is included somewhere further up the chain anyhow.

Hi Jacek, that did the trick! Thanks so much!