need help SigSegv fault with normal + calculation

[JonnyQB]

hi there;
i need help to figure out my problem
everytime i try to debugg it there is a sigsegv fault
here are my classes:

#include "munition.h"
#include "gegner.h"
#include "mainwindow.h"
#include "game.h"
#include "punkte.h"
#include "QTimer"
#include "QDebug"
#include "QGraphicsScene"
extern MainWindow * mainwindow;
Munition::Munition()
{
//rect zeichnen
setRect(0,0,2,10);

//connect
QTimer *timer =new QTimer();
connect(timer,SIGNAL(timeout()),this,SLOT(move()));
timer->start(40);

}

void Munition::move()
{

//Punkte * punkte;
//muni kollidiert
QList<QGraphicsItem *> colliding_items=collidingItems();
for(int i=0,n=colliding_items.size();i<n;i++)
{
    if(typeid (*(colliding_items[i]))==typeid(Gegner))
    {

        punkten->punkten();//here i go to the other class
        //mainwindow->punkte->punkten();
        //both removen
        scene()->removeItem(colliding_items[i]);
        scene()->removeItem(this);
        //delete both
        delete colliding_items[i];
        delete this;
        return;
    }

}

//move muni up
setPos(x(),y()-10);

if(pos().y()<0)
{
    scene()->removeItem(this);
    delete this;

}

}

#include "punkte.h"
#include "QFont"
using namespace std;
Punkte::Punkte(QGraphicsItem *parent): QGraphicsTextItem(parent)
{
punkte=0;
plus=250;

setPlainText(QString("punkte:")+QString::number(punkte));
setDefaultTextColor(Qt::red);
setFont(QFont("times",16));

}

void Punkte::punkten()
{

punkte=plus+punkte;//here the SEGSEGV Fault happends 
setPlainText(QString("punkte:")+QString::number(punkte));
return;

}

int Punkte::getPunkte()
{
return punkte;
}

[J.Hilk]

@JonnyQB said in [need help SigSegv fault with normal + calculation]

that‘s most likely an incorrect jump into your source file, happens.

I‘m way more concerned about the delete this; inside a Slot of a Qobject based clas!!!
don‘t do that, rather call deleteLater()

[JonnyQB]

@J-Hilk
ok i will try this

[JonnyQB]

now i tried it with global but there is the same problem

[mrjj]

Hi
Are you sure that punkten-> is a valid pointer ?
You do not seem to assign to it before calling it.

QList<QGraphicsItem *> colliding_items=collidingItems();
for(int i=0,n=colliding_items.size();i<n;i++)
{
    if(typeid (*(colliding_items[i]))==typeid(Gegner))
    {

        punkten->punkten();// where do u set punkten to anything valid ?

[JonnyQB]

im my header file

class Munition : public QObject,public QGraphicsRectItem
{
Q_OBJECT
public:
Punkte * punkten;
Munition();
public slots:
void move();

};

#endif // MUNITION_H

[mrjj]

@JonnyQB
Hi
That is a dangling pointer.
It will point to random memory.
So if you do not assign it anywhere, that is the reason you crash.

Like
punkten = new Punkte();

[JonnyQB]

@mrjj
as what schould i declare it
punkten=new Punkte(); got the c++ requiers a type specifier...

[mrjj]

@JonnyQB
Hi
You declare it like
Punkte * punkten;

Then some place else you must do
punkten = new Punkte(); ( not in .h)
Often the constructor is a good place.