Standard Exit button usage

[prophet23]

Standard Exit button
Hello Qt experts,

I have the application with .ui file specified in Qt Designer. The application starts several processes during execution. Question is about their termination.
I have already manage to close them with the button I created.
However I would like to do it by clicking standard Exit button [X]. How can I use that button to close gracefully all the active processes?

The main function is a standard one:

#include <QApplication>
 
#include "myqtapp.h"
 
 
 int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    myQtApp *dialog = new myQtApp;
 
    dialog->show();
    return app.exec();
}

#include <QApplication>

#include "myqtapp.h"


 int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    myQtApp *dialog = new myQtApp;

    dialog->show();
    return app.exec();
}

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The application is as follows:

myQtApp::myQtApp(QWidget *parent)
{
	setupUi(this); // this sets up GUI
 
	RWS_start(); // this function starts process/processes
 
	connect( _quit, SIGNAL( clicked() ), this, SLOT( quit() ) );	
 
}
 
myQtApp::~myQtApp()
{
 
}
 
void myQtApp::RWS_start(){
 
	 QProcess *process = new QProcess(this);
	 QString Path = "C:\\Robostacker\\RWS\\RobWorkStudio.exe";
	 process->start(Path, QStringList() << "");
 
}

myQtApp::myQtApp(QWidget *parent)
{
	setupUi(this); // this sets up GUI

	RWS_start(); // this function starts process/processes

	connect( _quit, SIGNAL( clicked() ), this, SLOT( quit() ) );	

}
 
myQtApp::~myQtApp()
{
	
}

void myQtApp::RWS_start(){

	 QProcess *process = new QProcess(this);
	 QString Path = "C:\\Robostacker\\RWS\\RobWorkStudio.exe";
	 process->start(Path, QStringList() << "");

}

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It would be interesting to add the Window which ask user if is sure that want to close the application.
The Window should appear after click the standard Exit button [X].
Any tips or even better the examples to solve that best?

[stampede]

QWidget::closeEvent