Qt progra crashing when using ui->

emeriska

Hi, so I'm setting up this program with Qt Designer, but for one part I need to be able to control (add and delete) button from the program so I use a QList and I code the widget myself without Qt Designer.

The thing is when in my code I use ui-> to refer to a widget created with Qt Designer my program crash. Everytime. In every cases. I mean I tried doing basic setGeometry for some widget and as soon as I use ui->ExampleWidget->whateverFunction(); the program crashes on startup with the famous "Stopped responding error"

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

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

void MainWindow::addEmp()
{
listEmp.append(new QPushButton("Text Here"));
thislayout = new QGridLayout;
thislayout->addWidget(listEmp.back(), 0, 0);

ui->empWidget->setLayout(thislayout);        //runs fine if I remove this line

}

MainWindow::~MainWindow()
{
delete ui;
delete listEmp[0];
}
@

@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtWidgets>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
void addEmp();
~MainWindow();

private:
Ui::MainWindow *ui;

QList<QPushButton*> listEmp;
QGridLayout *thislayout;

};

#endif // MAINWINDOW_H
@

Thanks a lot guys!

SGaist

Hi and welcome to devnet,

@
{
addEmploye();
ui->setupUi(this);
}@

The problem is that you are calling addEmploye first. Doing so, ui has not been initialized yet so none of its widgets exists. ui->setupUi(this) must be called first.