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main.cpp#include <QApplication>#include <QIcon>#include "sourceedit.h"int main(int argc, char *argv[]){	QApplication app(argc, argv);	MyWidget *widget = new MyWidget(0);	widget->resize(800,600);	widget->show();	return app.exec();}sourceedit.cpp#include <QTextEdit>#include <QPushButton>#include "sourceedit.h"#include "preferences.h"MyWidget::MyWidget(QWidget *parent)    : QWidget(parent){	button = new QPushButton( "Optionen",this);	connect(button, SIGNAL(clicked()), this, SLOT(showOptions()));	edit = new QTextEdit(this);	edit->setGeometry(10,40,width()-10, height()-10);}QTextEdit *MyWidget::GibZeiger(){	return edit;}void MyWidget::showOptions(){	MyPreferences *prefs = new MyPreferences(0);	prefs->resize(700,400);	prefs->show();  // -> Hier neu  pref->SetzeZeiger( edit )}sourceedit.h#ifndef SOURCEEDIT_H#define SOURCEEDIT_H#include <QWidget>#include <QTextEdit>#include <QPushButton>class MyWidget : public QWidget{	Q_OBJECTpublic:	MyWidget(QWidget *parent = 0);public slots:	void showOptions();	QTextEdit *GibZeiger();private:	QTextEdit *edit;		QPushButton *button;};#endifproference.cpp#include <QPushButton>#include <QTextEdit>#include "preferences.h"#include "sourceedit.h"MyPreferences::MyPreferences(QWidget *parent)    : QWidget(parent){	okButton = new QPushButton("Apply", this);	okButton->move(10,10);	connect(okButton, SIGNAL(clicked()), this, SLOT(applyChanges()));	label = new QLabel(this);	label->setGeometry(10,70,150,30);	edit = 0;}void MyPreferences::applyChanges(){/*	MyWidget mainclass;	QTextEdit* Zeiger = mainclass.GibZeiger();	SetzeZeiger( Zeiger );*/  // -> hier neu	TueWasMitFremdzeiger();}void MyPreferences::SetzeZeiger( QTextEdit* Zeiger ){	edit = Zeiger;}void MyPreferences::TueWasMitFremdzeiger(){	if( edit != 0 )	{		edit->setText("evtl funktioniert es");		edit->selectAll();		edit->setFontPointSize(6);	}}preference.h#ifndef PREFERENCES_H#define PREFERENCES_H#include <QWidget>#include <QPushButton>#include <QLabel>#include "sourceedit.h"class MyPreferences : public QWidget{	Q_OBJECTpublic:	MyPreferences(QWidget *parent = 0);	public slots:	void applyChanges();	void SetzeZeiger( QTextEdit* Zeiger );	void TueWasMitFremdzeiger();private:	QPushButton *okButton;	QLabel *label;	QTextEdit *edit;};#endif