c++ - Qt Update QPixmapItem in QGraphicsScene -

i want have image in main window buttons laid out on top of image. using view, scene , pixmap item when try change pixmap item in slot function, crash.

here example of have:

mainwindow::mainwindow(qwidget *parent) : qmainwindow(parent), ui(new ui::mainwindow) {     ui->setupui(this);      //scene, view, pixitem , button private variables in header     qgraphicsscene *scene = new qgraphicsscene(this);     qgraphicsview *view = new qgraphicsview(scene);     qgraphicspixmapitem *pixitem = new qgraphicspixmapitem;      pixitem->setpixmap(qpixmap(":/img/this.png"));     scene->additem(pixitem);      qpushbutton *button = new qpushbutton(view);     this->connect(button,signal(clicked()),this,slot(slot()));      this->setcentralwidget(view); }  void mainwindow:slot() {     pixitem->setpixmap(qpixmap(":/img/that.png")); } 

possible duplicate solution did not work me: qt update pixmap of qgraphicspixmapitem

you have shadowed member variable pixitem because using

qgraphicspixmapitem *pixitem = new qgraphicspixmapitem; 

the pixitem added scene reference local variable, not member variable. change

pixitem = new qgraphicspixmapitem;