//main.cpp file

#include <QApplication>
#include <QMainWindow>
#include "mywindow.h"
int main(int argc, char **argv)
{
	QApplication app(argc, argv);

	MyWindow *window = new MyWindow();    
    
        window->setWindowTitle(QString::fromUtf8("Handling QKeyEvent"));
        window->resize(336, 227);
	
	window->show();
	return app.exec();
}

//mywindow.h File

#ifndef MYWINDOW_H
#define MYWINDOW_H
#include<QMainWindow>
#include<QMessageBox>
#include<QKeyEvent>

class MyWindow: public QMainWindow
{
  Q_OBJECT
  
  public:    
	MyWindow()
	{};
	~ MyWindow(){};
   public :    
	void keyPressEvent(QKeyEvent* e)
	{
	      QMessageBox* box = new QMessageBox();
	      box->setWindowTitle(QString("Hello"));
	      box->setText(QString("You Pressed: ")+ e->text());
	      box->show();
	};
};
#endif