link error LNK2001 with Q_OBJECT

[mioan]

Hi, have a windows screensaver that I am converting to use QT.
I made it use QSettings for the ini settings.

I want to use QTimer and it sais I must include Q_OBJECT in the class definition for the slots to work with the timer.
When I put Q_OBJECT, I get this link error:
error LNK2001: unresolved external symbol "public: virtual struct QMetaObject


Which lib do I need to include?

I am developing the windows screensaver with visual studio 2005
Here is my linker settings:

/OUT:"c:\windows\SYSTEM32\STARMSG.SCR" /INCREMENTAL:NO /NOLOGO /MANIFEST /MANIFESTFILE:"c:\windows\temp\STARMSG.SCR.intermed iate.manifest" /NODEFAULTLIB:"LIBCD" /DEF:".\StarMsg.def" /PDB:".\..\Release/STARMSG.pdb" /SUBSYSTEM:WINDOWS /MACHINE:X86 /ERRORREPORT:PROMPT Qt3Support4.lib QtGui4.lib QtCore4.lib winmm.lib scrnsave.lib WSOCK32.lib Comctl32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib

Thanks for any ideas.
Mike

[lyuts]

Show us this code.

While code is missing, the first guess is that you should run qmake after adding Q_OBJECT.

[auba]

I guess this is a VStudio project... ? Has the (generated) moc_-file been added to the source files?

[mioan]

Dear lyuts and auba,
thank you for your replies.

yes, I have written this screensaver in visual studio and I want to gradually transfer it to QT.

1) I could not find any moc_*.* files that I could include in the source.
(Except of lost of files in the qt folders)
Which one should I include in the source files?

2) The source is this one:

////////////////////////////////////////////////////
// TmioanScreenSaveAppl.h
 
#pragma once
 
#include "TmioanApplication.h"
#include <QTimer.h>
#include <QObject.h>
 
 
class TmioanScreenSaveAppl: public TmioanApplication, QObject
{
	// Q_OBJECT
	// With Q_OBJECT the linker gives an error
	// Without Q_OBJECT the timer does not work
 
	// All classes that contain signals or slots must mention Q_OBJECT at the top of their declaration. 
	// They must also derive (directly or indirectly) from QObject.
 
 
private:
	QTimer *timer;
 
public:
	TmioanScreenSaveAppl(char *aCompanyName, char *aProductName);
	virtual ~TmioanScreenSaveAppl(void);
 
	void Startup(void);
	void Shutdown(void);
 
public slots:
	void Advance(void);
 
	void ConfigDialog(void);
};
 
 
////////////////////////////////////////////////////
// TmioanScreenSaveAppl.cpp
 
#include "TmioanScreenSaveAppl.h"
#include "LogFileClass.h"
 
 
TmioanScreenSaveAppl::TmioanScreenSaveAppl(char *aCompanyName, char *aProductName)
{
	 timer = new QTimer();
	 connect(timer, SIGNAL(timeout()), this, SLOT(Advance()));
}
 
 
TmioanScreenSaveAppl::~TmioanScreenSaveAppl(void)
{
	delete timer;
}
 
 
void TmioanScreenSaveAppl::Startup(void)
{
	timer->start(50); // millisecond
	LogFile.add(lm_INFOLN,"TmioanScreenSaveAppl","Startup()");
}
 
 
void TmioanScreenSaveAppl::Shutdown(void)
{
	timer->stop();
}
 
void TmioanScreenSaveAppl::Advance(void)
{
	LogFile.add(lm_INFOLN,"TmioanScreenSaveAppl","Advance()");
}
 
 
 
 
void TmioanScreenSaveAppl::ConfigDialog(void)
{
 
}

////////////////////////////////////////////////////
// TmioanScreenSaveAppl.h

#pragma once

#include "TmioanApplication.h"
#include <QTimer.h>
#include <QObject.h>


class TmioanScreenSaveAppl: public TmioanApplication, QObject
{
	// Q_OBJECT
	// With Q_OBJECT the linker gives an error
	// Without Q_OBJECT the timer does not work

	// All classes that contain signals or slots must mention Q_OBJECT at the top of their declaration. 
	// They must also derive (directly or indirectly) from QObject.
	

private:
	QTimer *timer;

public:
	TmioanScreenSaveAppl(char *aCompanyName, char *aProductName);
	virtual ~TmioanScreenSaveAppl(void);

	void Startup(void);
	void Shutdown(void);
	
public slots:
	void Advance(void);

	void ConfigDialog(void);
};


////////////////////////////////////////////////////
// TmioanScreenSaveAppl.cpp

#include "TmioanScreenSaveAppl.h"
#include "LogFileClass.h"


TmioanScreenSaveAppl::TmioanScreenSaveAppl(char *aCompanyName, char *aProductName)
{
	 timer = new QTimer();
	 connect(timer, SIGNAL(timeout()), this, SLOT(Advance()));
}


TmioanScreenSaveAppl::~TmioanScreenSaveAppl(void)
{
	delete timer;
}


void TmioanScreenSaveAppl::Startup(void)
{
	timer->start(50); // millisecond
	LogFile.add(lm_INFOLN,"TmioanScreenSaveAppl","Startup()");
}


void TmioanScreenSaveAppl::Shutdown(void)
{
	timer->stop();
}

void TmioanScreenSaveAppl::Advance(void)
{
	LogFile.add(lm_INFOLN,"TmioanScreenSaveAppl","Advance()");
}




void TmioanScreenSaveAppl::ConfigDialog(void)
{

}

To copy to clipboard, switch view to plain text mode