QToolbar: Trying to reset value of QSpinBox in QToolbar via QToolbutton results crash

[myta212]

Hi Janoschka,
The problem is your definition : QSpinBox *lostSpinBox
in the constructor mainwindow.

Please edit your code like this :
MainWindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    lostSpinBox = new QSpinBox(ui->mainToolBar);
    lostSpinBox->setMaximum(10000);
    ui->mainToolBar->addWidget(lostSpinBox);
    lostSpinBox->setValue(0); // here it works
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_actionLostReset_triggered()
{
    if (ui->actionLostReset->isChecked())
    {
        lostSpinBox->setValue(10); // here it crashes
    }
}

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    lostSpinBox = new QSpinBox(ui->mainToolBar);
    lostSpinBox->setMaximum(10000);
    ui->mainToolBar->addWidget(lostSpinBox);
    lostSpinBox->setValue(0); // here it works
}

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

void MainWindow::on_actionLostReset_triggered()
{
    if (ui->actionLostReset->isChecked())
    {
        lostSpinBox->setValue(10); // here it crashes
    }
}

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MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QSpinBox>
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private:
    Ui::MainWindow *ui;
    QSpinBox *lostSpinBox;
 
public slots:
    void on_actionLostReset_triggered();
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QSpinBox>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
    
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    
private:
    Ui::MainWindow *ui;
    QSpinBox *lostSpinBox;

public slots:
    void on_actionLostReset_triggered();
};

#endif // MAINWINDOW_H

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Best regards,

Toto

[Janoschka]

Hi Toto!
Thank you very, very much!!!!

I was so dumb and blind, because after your posting I realised I made the correct things in mainwindow.h, but I made some kind of redefinition in mainwindow.c.

Sometimes it's better to have someone to look at the code....

Have a nice day