I have a question about my programm.
After compiling it, i only see a few moment a graphical interface and then the programm will closed.
I tryed to copy some synthax from working example code but it seems that i have somewhere do a mistake...
I thinkt it´s not a hard problem, but for hel i´m really grateful.
Here a snippet of my code:

//main.h , in my case it will open the NeuLoad case:

#include <QApplication>
#include "Hauptmenu.h"
#include "Funktionen.h"

int main(int argc, char *argv[] )
{
	QApplication app(argc,argv);
	Funktionen funktionen;	
	if(funktionen.FolderCheck()==true)
	{
		Hauptmenu window;
		window.show();
	}
	
	else
	{
		NeuLoad window2;
		window2.show();
	}
	
	return app.exec();
}

//NeuLoad.h

#ifndef NEULOAD_H
#define NEULOAD_H
#include <QtGui>
#include <QDialog>
#include <QMessageBox>
#include "ui_NeuLoad.h"

class NeuLoad : public QDialog, private Ui::NeuLoad
{
	Q_OBJECT
	
	public:
		NeuLoad();
		~NeuLoad() {}
	protected slots:
		void openHauptmenu();
		void openFreischaltcode();
	
		
	
};
#endif // NEULOAD_H

and the NeuLoad.cpp:

//NeuLoad.cpp

#include "NeuLoad.h"
#include "Hauptmenu.h"
#include "Freischaltcode.h"

NeuLoad::NeuLoad()
{
		
	setupUi(this);	

//Bereich für Signal Slot Verbindungen:
connect(neu, SIGNAL(clicked()),	
		this, SLOT(openHauptmenu()));			//Button neu ruft Hauptmenü auf
			
connect(best, SIGNAL(clicked()),	
		this, SLOT(openFreischaltcode()));		//Button best ruft Freischaltcodemenü auf
}
	
void NeuLoad::openHauptmenu()
{
	
	Hauptmenu *HaMenu = new Hauptmenu();
	HaMenu->show();
}
	
void NeuLoad::openFreischaltcode()
{
	Freischaltcode *FrMenu = new Freischaltcode();
	FrMenu->show();
}

Thank you for your help.

greetings
Allerknappe

[Edit: fixed markup ~~ @Wieland]