My software crashes

[Higgs]

Hi again.
I was writing simple software,which have one big window. 2 Qpushbutton in this window. Parent is main window.
when mouse cursor is approaching one of the button,button is moved at the other randomly got coordinate,and so on.

I get .exe I get all neccessary .DLL files. in folder where exe is placed. Then I create folder: "platforms". There are "qwindows.dll".
Everything seems all right but when I launch .exe file,suddenly it crashes.

Then I created simple program, just big window. Did the same thing and then launched without any crashes.
I think in code I have bug,which causes Segmentation fault.
But I dont have any idea where are my mistake:

.pro

QT += widgets
 
HEADERS += \
    dialog.h
 
SOURCES += \
    dialog.cpp \
    main.cpp

QT += widgets

HEADERS += \
    dialog.h

SOURCES += \
    dialog.cpp \
    main.cpp

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Dialog.h

#ifndef DIALOG_H
#define DIALOG_H
 
#include <QWidget>
#include <QPushButton>
#include <QPoint>
 
class Dialog : public QWidget
{
    Q_OBJECT
public:
    explicit Dialog(QWidget *parent = 0);
 
signals:
    void PositionChanged();
 
public slots:
    void getNewPosition();
 
private:
    QPushButton *button1;
    QPushButton *button2;
    QPoint point1; //button1 position
    QPoint point2; //button2 position
    bool SecondButton;
    bool FirstButton;
 
protected:
    void mouseMoveEvent(QMouseEvent *);
 
};
 
#endif // DIALOG_H

#ifndef DIALOG_H
#define DIALOG_H

#include <QWidget>
#include <QPushButton>
#include <QPoint>

class Dialog : public QWidget
{
    Q_OBJECT
public:
    explicit Dialog(QWidget *parent = 0);

signals:
    void PositionChanged();

public slots:
    void getNewPosition();

private:
    QPushButton *button1;
    QPushButton *button2;
    QPoint point1; //button1 position
    QPoint point2; //button2 position
    bool SecondButton;
    bool FirstButton;

protected:
    void mouseMoveEvent(QMouseEvent *);

};

#endif // DIALOG_H

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Dialog.cpp

#include "dialog.h"
#include <QPushButton>
#include <QWidgetItem>
#include <QPoint>
#include <QKeyEvent>
Dialog::Dialog(QWidget *parent) :
    QWidget(parent)
{
    //main window size
    setFixedSize(650,440);
 
    //button1 related things
    button1 = new QPushButton(this);
    button1->setGeometry(QRect(200,200,75,23));
    button1->setText("one");
 
    //button2 related things
    button2 = new QPushButton(this);
    button2->setGeometry(QRect(300,200,75,23));
    button2->setText("two");
    point1 = button1->pos();
    point2 = button2->pos();
 
    connect(this,SIGNAL(PositionChanged()),this,SLOT(getNewPosition()));
 
    setMouseTracking(true);
    SecondButton = true;
    FirstButton = true;
}
void Dialog::getNewPosition()
{
    point1 = button1->pos();
    point2 = button2->pos();
}
void Dialog::mouseMoveEvent(QMouseEvent *event)
{
    if(FirstButton && (( event->x() > point1.x() - 30 && event->x() < point1.x() + 105 )
            && (event->y() > point1.y() - 30 && event->y() < point1.y() + 54)))
    {
        //get random (x,y) coordinate
        int x = rand() % 550;
        int y = rand() % 400;
        button1->setGeometry(QRect(x,y,75,23));
        emit PositionChanged();
        SecondButton = false;
    }
    else if(SecondButton && ((event->y() > point2.y()-30 && event->y() < point2.y()+54)
            && ( event->x() > point2.x()-30 && event->x() < point2.x() + 105)))
    {
        //get random (x,y) coordinate
        int x = rand() % 550;
        int y = rand() % 400;
        button2->setGeometry(QRect(x,y,75,23));
        emit PositionChanged();
        FirstButton = false;
    }
}

#include "dialog.h"
#include <QPushButton>
#include <QWidgetItem>
#include <QPoint>
#include <QKeyEvent>
Dialog::Dialog(QWidget *parent) :
    QWidget(parent)
{
    //main window size
    setFixedSize(650,440);

    //button1 related things
    button1 = new QPushButton(this);
    button1->setGeometry(QRect(200,200,75,23));
    button1->setText("one");

    //button2 related things
    button2 = new QPushButton(this);
    button2->setGeometry(QRect(300,200,75,23));
    button2->setText("two");
    point1 = button1->pos();
    point2 = button2->pos();

    connect(this,SIGNAL(PositionChanged()),this,SLOT(getNewPosition()));

    setMouseTracking(true);
    SecondButton = true;
    FirstButton = true;
}
void Dialog::getNewPosition()
{
    point1 = button1->pos();
    point2 = button2->pos();
}
void Dialog::mouseMoveEvent(QMouseEvent *event)
{
    if(FirstButton && (( event->x() > point1.x() - 30 && event->x() < point1.x() + 105 )
            && (event->y() > point1.y() - 30 && event->y() < point1.y() + 54)))
    {
        //get random (x,y) coordinate
        int x = rand() % 550;
        int y = rand() % 400;
        button1->setGeometry(QRect(x,y,75,23));
        emit PositionChanged();
        SecondButton = false;
    }
    else if(SecondButton && ((event->y() > point2.y()-30 && event->y() < point2.y()+54)
            && ( event->x() > point2.x()-30 && event->x() < point2.x() + 105)))
    {
        //get random (x,y) coordinate
        int x = rand() % 550;
        int y = rand() % 400;
        button2->setGeometry(QRect(x,y,75,23));
        emit PositionChanged();
        FirstButton = false;
    }
}

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main.cpp

#include <QApplication>
#include "dialog.h"
 
int main(int argc,char *argv[])
{
    QApplication app(argc,argv);
 
 
    Dialog dg;
    dg.show();
 
    return app.exec();
}

#include <QApplication>
#include "dialog.h"

int main(int argc,char *argv[])
{
    QApplication app(argc,argv);


    Dialog dg;
    dg.show();

    return app.exec();
}

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Any Ideas?

P.S sorry for my English. It isn't my native language

[Santosh Reddy]

Everything seems all right but when I launch .exe file,suddenly it crashes.

What is the error shown?

[Higgs]

What is the error shown?

Capture.JPG

Then,when I look at event log:

Capture2.JPG

I'm working on the code and i think problem is this:

button1 = new QPushButton(this);

button1 = new QPushButton(this);

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When I remove "this" parent. Everything works just fine
but without "this" I can't add buttons to mainWindow.

---

Added after 1 21 minutes:

I'have just commented this line:

button1->setText("one");

button1->setText("one");

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and it works! It doesn't crash
But Can't set text on a button

[Lesiok]

For me (Microsoft Visual C++ 2008 32 bit, Qt 4.8.5) all is working without problems. What is your compiler ?

[Higgs]

For me (Microsoft Visual C++ 2008 32 bit, Qt 4.8.5) all is working without problems. What is your compiler ?

Microsoft Visual C++ 2012 32 Bit.
Qt 5.1.1

P.S I take .exe from Release folder.

[Santosh Reddy]

Do you have multiple versions of Qt on your machine?

[Higgs]

Do you have multiple versions of Qt on your machine?

I think no. But At first I had many versions installed on my computer. First 4.x then 5.1 an then also 5.1(uninstaled and then installed again)
now,I have Qt 5.1.1. Seems I haven't other version of Qt.