QObject::connect: No such slot QWidget::showTimee()

[AQTStudent]

My error:
QObject::connect: No such slot QWidget::showTimee() in ../TUecomotivefinal/digitalclock.cpp:11

digitalclock.h:

#ifndef DIGITALCLOCK_H
#define DIGITALCLOCK_H
#include <QWidget>
class DigitalClock : public QWidget
{
public:
    DigitalClock(QWidget *parent = 0);
public slots:
    void showTimee();
private:
};
#endif // DIGITALCLOCK_H

digitalclock.cpp

#include "digitalclock.h"
#include <QDebug>
#include <QtWidgets>
#include <QObject>
DigitalClock::DigitalClock(QWidget *parent)
    : QWidget(parent)
{
    QTimer *timer2 = new QTimer(this);
    QObject::connect(timer2, SIGNAL(timeout()), this, SLOT(showTimee()));
    timer2->start(10000);
}
void DigitalClock::showTimee(){
        QTime time = QTime::currentTime();
        QString text = time.toString("hh:mm");
        qDebug() << text;
}

I am kind of new to C++ and new to QT.. I'm hoping someone can help. Thanks in advance!

[mcosta]

Hi,

you have to add Q_OBJECT in your class declaration

#ifndef DIGITALCLOCK_H
#define DIGITALCLOCK_H
#include <QWidget>
class DigitalClock : public QWidget
{
    Q_OBJECT

public:
    DigitalClock(QWidget *parent = 0);
public slots:
    void showTimee();
private:
};
#endif // DIGITALCLOCK_H

[AQTStudent]

@mcosta
Nice! This solved it!
Can you explain why I need to set this?
Knowing the solution is one, but understanding is more important ;p

[A Former User]

Hi,
the Q_OBJECT macro is used to tell the MOC (meta object compiler) that a particular class uses Qt's signals and slots mechanism.

[mcosta]

Hi,

you can found more information here and here

[briantranscend]

@mcosta I do have !_Object added to my class declaration and yet the issue persists

[mrjj]

@briantranscend
Hi
if it still persists then go to the build folder and delete all files.
then rebuild

[SGaist]

@briantranscend hi and welcome to devnet,

Did you re-run qmake after adding the Q_OBJECT macro ?

[Pablo J. Rogina]

@briantranscend please take a look at the new syntax for signals & slots
It'll help you catch errors at compile time...