Slots in derived classes

[Thomas Nesges]

Hi,

I wanted to add a slot CurTime() to a QLabel which displays the current
datetime, so I created a new class DateTimeLabel, derived from QLabel.
When I start the small application I get the following errormessage:

 QObject::connect: No such slot QLabel::CurTime()

Here's my code:

// Header of DateTimeLabel

#include <qlabel.h>
#include <qdatetime.h>

  class DateTimeLabel : public QLabel {
  // Q_OBJECT
  public:
    DateTimeLabel();
    ~DateTimeLabel();
  public slots:
    void CurTime();
  public:
  QDateTime m_CurTime;
};


// Code of DateTimeLabel

#include "datetimelabel.h"

DateTimeLabel::DateTimeLabel()
{
  CurTime();
}

DateTimeLabel::~DateTimeLabel()
{
}

// Here's the slots implementation
void DateTimeLabel::CurTime()
{
  m_CurTime = QDateTime::currentDateTime();
  this->setText(m_CurTime.toString());
}


// main

#include <qapp.h>
#include <qtimer.h>
#include <qlabel.h>
#include <datetimelabel.h>


int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
	
  DateTimeLabel *Label = new DateTimeLabel();
  Label->setGeometry(100,100,200,20);
  app.setMainWidget(Label);
    	
  QTimer *timer = new QTimer();
  timer->start( 1000, FALSE );

  // Here I try to connect timeout() to CurTime()
  QObject::connect( timer, SIGNAL(timeout()), 
                    Label, SLOT(CurTime()) );
  Label->show();

  return app.exec();
}


Ca somebody point me to what I have missunderstood?
Qt documentation says, that every class that uses slots has to 'mention'
Q_OBEJCT in it's definition. If I try to insert it (uncomment it), I get 
the followings:

/opt/kde/lib/libkdeui.so: warning: multiple common of `QArrayT<char>
type_info node'
datetimelabel.o: warning: previous common is here
/opt/kde/lib/libkdecore.so: warning: multiple common of `QArrayT<char>
type_info node'
datetimelabel.o: warning: previous common is here
/usr/lib/libqt.so: warning: multiple common of `QArrayT<char> type_info
node'
datetimelabel.o: warning: previous common is here
datetimelabel.o: In function `QArrayT<char> type_info function':
/usr/lib/qt/include/qarray.h(.text+0x19): undefined reference to
`DateTimeLabel::QPaintDevice virtual table'
/usr/lib/qt/include/qarray.h(.text+0x20): undefined reference to
`DateTimeLabel virtual table'
datetimelabel.o: In function `DateTimeLabel::~DateTimeLabel(void)':
/home/thomas/KDevelop/qtclock/qtclock/datetimelabel.cpp:26: undefined
reference to `DateTimeLabel::QPaintDevice virtual table'
/home/thomas/KDevelop/qtclock/qtclock/datetimelabel.cpp:26: undefined
reference to `DateTimeLabel virtual table'
collect2: ld returned 1 exit status
make: *** [qtclock] Error 1
*** Fehler ***

What trys KDevelop to tell me?

TIA Thomas
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