<![CDATA[Creating a cubeview object (qt3d) in mainWindow.cpp file]]>@#include <QApplication>
#include<mainwindow.h>
#include <iostream>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow mainWin;
mainWin.resize(800, 600);
mainWin.show();
return app.exec();
}
@
And my MainWindow .cpp file
@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "cubeview.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
CubeView view;
}

MainWindow::~MainWindow()
{
delete ui;
}@

But, I get a runtime error when i try to to create a cubeview class object in my mainwindow.cpp file

Cubeview is a graphics class which creates(one that comes with qt3d) cube on scree. This object works perfectly when created in the main.cpp file. What is the problem here?

]]>https://forum.qt.io/topic/49373/creating-a-cubeview-object-qt3d-in-mainwindow-cpp-fileRSS for NodeMon, 16 Mar 2026 17:56:50 GMTThu, 18 Dec 2014 10:48:33 GMT60<![CDATA[Reply to Creating a cubeview object (qt3d) in mainWindow.cpp file on Wed, 24 Dec 2014 08:42:12 GMT]]>I found an answer. We cannot create the object in a loop of a slot.

@

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
view=0;
//create the icons for all the UI push button and resize the buttons
ui->pushButton->setIcon(QIcon(":/pattern4.jpg"));
ui->pushButton->resize(buttonsize);
}

void MainWindow::on_pushButton_clicked()
{
//if this is the first button to be clicked on the UI
if(view==NULL)
{
view=new CubeView(ui->centralwidget);
view->begin(4);
view->resize(800, 600);
view->show();
}
//for all later clicks
else if(view!=NULL)
{
std::cout<<"A window is already open"<<std::endl;
view->close();//close the already open window
view->begin(4);//begin graphics & haptics loop
view->resize(800, 600);
view->show();
}
}

MainWindow::~MainWindow()
{
delete ui;
if(view!=NULL){
std::cout<<"view object deleted"<<std::endl;
delete view;}
;
}
@

]]>https://forum.qt.io/post/255377https://forum.qt.io/post/255377Wed, 24 Dec 2014 08:42:12 GMT