Why won't my simple Qt code work?

Question

1.00/5 (1 vote)

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Okay, so I'm trying to simply add a custom class of mine as a child of a frame in my main window in Qt:

customctrl.h:

C++

#ifndef CUSTOMCTRL_H
#define CUSTOMCTRL_H

#include <QWidget>

namespace Ui {
class customctrl;
}

class customctrl : public QWidget
{
    Q_OBJECT
    
public:
    explicit customctrl(QWidget *parent = 0);
    ~customctrl();
    
private:
    Ui::customctrl *ui;
};

#endif // CUSTOMCTRL_H

and my main window:

C++

#include "customctrl.h"

//A bunch of code...
{
    customctrl *cc = new customctrl();
    ui->frame->layout()->addWidget(cc);
}

And yet, every time I run this code, my program crashes and I don't know why. Is there something I'm missing? What am I doing wrong? Please help me! Thank you!!!

Posted 20-Jun-13 16:31pm

RadXPictures

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Richard MacCutchan 21-Jun-13 3:34am

Step through the code with the debugger to see exactly what is happening.

RadXPictures 24-Jun-13 15:18pm

When I try debugging I get a "debugger not set up" error. Any idea?

2 solutions

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RadXPictures · Answer 1 · 2013-06-24T09:49:00

Solution 2

Wow... just figured out an unbelievably simple solution. Thanks anyways guys.

C++

customctrl *cc = new customctrl(ui->frame);
cc->show();

Posted 24-Jun-13 9:49am

RadXPictures

Dark Darkling · Answer 2 · 2013-06-21T00:00:00

Solution 1

You need to implement all methods from 'customctrl.h' file in 'customctrl.cpp' file:

customctrl.cpp
========================================

#include "customctrl.h"


customctrl::customctrl(QWidget *parent = 0) : QWidget(parent) 
{
  resize(50, 50);
  setWindowTitle("Qt");
}


customctrl::~customctrl() {;}

=========================================

Posted 21-Jun-13 0:00am

Dark Darkling

Updated 21-Jun-13 0:27am

v2

Comments

RadXPictures 23-Jun-13 22:28pm

Sorry, probably should have posted it, but I already had:

#include "customctrl.h"
#include "ui_customctrl.h"

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

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

It was auto-generated.