SLOT connection problem

[Shodan]

Hi

I d'like to run external *.exe files in my program.

There is one error:
QObject::connect: No such slot QWidget::runCleaner() in ..\Tests\arcMainWindow.cpp:11
But the slot is there.

When I run the programm, the window opens, and of course, nothing happens when the button is pushed.

Here is the code:

---

Tests.pro

QT += widgets

SOURCES += \
    main.cpp \
    arcMainWindow.cpp

HEADERS += \
    arcMainWindow.h

---

arcMainWindow.h

#ifndef MYWINDOW_H
#define MYWINDOW_H

#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QProcess>
#include <QObject>

class arcMainWindow : public QWidget // On hérite de QWidget
{
    public:
    arcMainWindow();

    public slots:
    void runCleaner();

    private:
    QPushButton *m_btn;
};

#endif // MYWINDOW_H

---

main.cpp

#include "arcMainWindow.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    arcMainWindow mainWindow;
    mainWindow.show();

    return app.exec();
}

---

arcMainWindow.cpp

#include "arcMainWindow.h"

arcMainWindow::arcMainWindow() : QWidget()
{
    setFixedSize(300, 150);

    m_btn = new QPushButton("CCleaner", this);
    m_btn->setFont(QFont("Comic Sans MS", 14));
    m_btn->setCursor(Qt::PointingHandCursor);
    m_btn->move(60, 50);
    QObject::connect(m_btn, SIGNAL(clicked()), this, SLOT(runCleaner()));
}

void arcMainWindow::runCleaner()
{
    QProcess *myProcess = new QProcess();
    myProcess->start( "\"C:\\Program Files\\CCleaner\\CCleaner.exe\"" );
}

---

Any ideas??

Thanks in advance =)

[Devopia53]

@Shodan

Hi.

You are missing Q_OBJECT macro in the arcMainWindow.h.
The Q_OBJECT is required to use Signal & Slots.

like this:

class arcMainWindow : public QWidget // On hérite de QWidget
{
    Q_OBJECT

    public:
    arcMainWindow();

[Shodan]

This is it!

At the begining I had the Q_OBJECT macro in the arcMainWindow.h file, but I had a lot of errors.
Certainly because I forgot to run qmake...?

I spent hours on that... :-)

Merci beaucoup

[Shodan]

Well, maybe it is a stupid question, but I try to understand...

My misstake was to forget to add Q_OBJECT macro in the arcMainWindow.h and to run qmake. OK

I cleared the Q_OBJECT macro to get back the "no such SLOT" error.
Then I added QT += core to the .pro file and Q_OBJECT to the .h file and it seems also to work .

What difference does this make?

[Devopia53]

@Shodan

Even if you add Q_OBJECT to the arcMainWindow.h, qmake will not run automatically when you build it.
The qmake will run automatically upon build when the .pro file is modified.

[Shodan]

Okay. Thanks.