Segmentation fault while creating Object for QApplication

[nrabara]

Yes user have rights to access /dev/fb0
Even I can run qt example code of frambuffer(examples/qws/framebuffer.) on board, and Its show me three rectangles on my display.

[wysota]

Do other examples work as well?

[nrabara]

All the example having QApplication object show segmentation fault.

But for QCoreApplication object, i can use QDateTime, QDate etc.. sub classes of QCoreApplication. It's works fine with QCoreApplication.

Is there any other way to test QApplication object, I mean
Can ./configure affect Qt Gui ?? I have tried with full configuration also.

Your suggestion would be great help for me..

[wysota]

Your problem is deployment, not compilation. Could you post a backtrace of an exemplory crash? An strace showing files being opened (and statuses of the calls) would be nice as well.

[nrabara]

Below is my test application code

main.cpp file

#include <QtGui/QApplication>
#include <QLabel>
#include "widget.h"
 
int main(int argc, char *argv[])
{
    printf("Inside main\n");
    unsigned int loop;
    QApplication a(argc, argv);
    printf("argc = %d \n",argc);
    for(loop=0;loop<argc;loop++)
    {
        printf("argv[%d] = %s \n",argc,argv[loop]);
    }
    Widget w;
    w.setFixedSize(200,200);
    w.show();
    return a.exec();
}
 
[B][U]widget.cpp file[/U][/B]
 
#include "widget.h"
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
}
 
Widget::~Widget()
{
 
}
 
[U][B]widget.h file[/B][/U]
 
#ifndef WIDGET_H
#define WIDGET_H
 
#include <QtGui/QWidget>
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    Widget(QWidget *parent = 0);
    ~Widget();
};
 
#endif // WIDGET_H

#include <QtGui/QApplication>
#include <QLabel>
#include "widget.h"

int main(int argc, char *argv[])
{
    printf("Inside main\n");
    unsigned int loop;
    QApplication a(argc, argv);
    printf("argc = %d \n",argc);
    for(loop=0;loop<argc;loop++)
    {
        printf("argv[%d] = %s \n",argc,argv[loop]);
    }
    Widget w;
    w.setFixedSize(200,200);
    w.show();
    return a.exec();
}

[B][U]widget.cpp file[/U][/B]

#include "widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
}

Widget::~Widget()
{

}

[U][B]widget.h file[/B][/U]

#ifndef WIDGET_H
#define WIDGET_H

#include <QtGui/QWidget>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
};

#endif // WIDGET_H

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Back trace of the above code is attached - file : QApplication_backtrace.txt

I have also attached back trace of qt's example code - framebuffer , file : QtFramebuffer_exampleCode.txt

Your suggestion would be a great help for me..

[wysota]

This is an strace. What about a debugger backtrace?

The strace suggests there is a problem with mapping the framebuffer to memory.

[nix]

Can you post result for the following command "fbset --info" too, thx.

[Vis]

Hi,

I am trying something similar on a an embedded system, albeit a different one.

How was this resolved, if at all?

I know that this thread is dated, but anything that can be recalled will be helpful.

Cheers,
--
Vis