MVC problem parameter handover

[Basti1990]

Hello forum

I tries for the first time at the Model View Controller programming.

I create three classes one for the logic, one for the Gui
and one for the controlling.

But i have a problem by the parameter handover in the logic class.

The application crashed after click button.

My test programm.

Header:

#ifndef LOGIC_H
#define LOGIC_H
 
#include <QDebug>
#include "gui.h"
 
class Gui;
 
class logic
{
 
    Gui *testgui;
 
public:
    logic(Gui *myGui);
 
    void writeTEST();
};
 
#endif // LOGIC_H

#ifndef LOGIC_H
#define LOGIC_H

#include <QDebug>
#include "gui.h"

class Gui;

class logic
{

    Gui *testgui;

public:
    logic(Gui *myGui);

    void writeTEST();
};

#endif // LOGIC_H

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CPP:

#include "logic.h"
 
 
logic::logic(Gui *myGui)
{
    testgui = myGui;
}
 
void logic::writeTEST()
{
    testgui->testTE->setText("test"); //application crashed
    //testgui->testTE->setText("test"); //application run if it comment out
}

#include "logic.h"


logic::logic(Gui *myGui)
{
    testgui = myGui;
}

void logic::writeTEST()
{
    testgui->testTE->setText("test"); //application crashed
    //testgui->testTE->setText("test"); //application run if it comment out
}

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Since the proplem is unmistakable by the function call exist.
I don't to see the wood for the trees.


I hope anybody can help me.

I do apologize for my bad english

best regards

Basti1990