[Signals & Slots] Custom class' signal not detected

[Mr_Cloud]

Hello All,

I've looked into how to write a class with QObject's inheritance so I can use signals as I need feedback from said class. The trouble is, I'm not sure if I defined the signal correctly, as it differs from the Signals & Slots example.

My code is as follows:

class worker : public QObject{
    Q_OBJECT
    public:
	worker();
 
	void execute (bool isExecuting){
		if (isExecuting==true){
			//do stuff
			emit scanUpdate(); //differs from the example's ValueChanged(int newValue)
		}
		else return;
	}
 
    signals:
	void scanUpdate();
}
 
class mainClass : public QMainWindow, Ui::MainWindow
{
	Q_OBJECT
 
public:
	mainClass() : QMainWindow()
	{
		setupUi(this);
		lib=new worker;
		connect(lib,SIGNAL(scanUpdate()),this,SLOT(pbScanUpdate()));
 
		while(1){ lib->execute(true); }
 
	}
worker *lib;
public slots:
void pbScanUpdate(){
	//do stuff which can only occur after lib->execute has been called
}
}

class worker : public QObject{
    Q_OBJECT
    public:
	worker();

	void execute (bool isExecuting){
		if (isExecuting==true){
			//do stuff
			emit scanUpdate(); //differs from the example's ValueChanged(int newValue)
		}
		else return;
	}

    signals:
	void scanUpdate();
}

class mainClass : public QMainWindow, Ui::MainWindow
{
	Q_OBJECT
	
public:
	mainClass() : QMainWindow()
	{
		setupUi(this);
		lib=new worker;
		connect(lib,SIGNAL(scanUpdate()),this,SLOT(pbScanUpdate()));

		while(1){ lib->execute(true); }

	}
worker *lib;
public slots:
void pbScanUpdate(){
	//do stuff which can only occur after lib->execute has been called
}
}

To copy to clipboard, switch view to plain text mode 

This compiles ok with the Q_OBJECT declarations, but I never see pbScanUpdate() running. What could I be missing?


Thanks in advance,
Mr_Cloud