Seg Fault

[giusepped]

I have the following code which compiles:

#include "mainwindow.h"
#include <QtGui>
mainWindow::mainWindow(QWidget *parent): QMainWindow(parent)
{
	detailsText  = new QTextEdit();
	listTable    = new QTableView();
	mainSplitter = new QSplitter(Qt::Horizontal,this);
	mainSplitter->addWidget(listTable);
	mainSplitter->addWidget(detailsText);
	setCentralWidget(mainSplitter);
}
 
 
mainWindow::~mainWindow()
{
}

#include "mainwindow.h"
#include <QtGui>
mainWindow::mainWindow(QWidget *parent): QMainWindow(parent)
{
	detailsText  = new QTextEdit();
	listTable    = new QTableView();
	mainSplitter = new QSplitter(Qt::Horizontal,this);
	mainSplitter->addWidget(listTable);
	mainSplitter->addWidget(detailsText);
	setCentralWidget(mainSplitter);
}


mainWindow::~mainWindow()
{
}

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But the execution fires a seg fault. Why?

[aamer4yu]

What exactly is the error message when u get the seg fault ?

[spirit]

looks good, but it'is hard to say what's wrong. provide compilable example.

[Kumosan]

I have the following code which compiles:

#include "mainwindow.h"
#include <QtGui>
mainWindow::mainWindow(QWidget *parent): QMainWindow(parent)
{
	detailsText  = new QTextEdit();
	listTable    = new QTableView();
	mainSplitter = new QSplitter(Qt::Horizontal,this);
	mainSplitter->addWidget(listTable);
	mainSplitter->addWidget(detailsText);
	setCentralWidget(mainSplitter);
}
 
 
mainWindow::~mainWindow()
{
}

#include "mainwindow.h"
#include <QtGui>
mainWindow::mainWindow(QWidget *parent): QMainWindow(parent)
{
	detailsText  = new QTextEdit();
	listTable    = new QTableView();
	mainSplitter = new QSplitter(Qt::Horizontal,this);
	mainSplitter->addWidget(listTable);
	mainSplitter->addWidget(detailsText);
	setCentralWidget(mainSplitter);
}


mainWindow::~mainWindow()
{
}

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But the execution fires a seg fault. Why?

It is very unlikely that the code above segfaults. Of course this is only the .cpp file. Any 'magic' in your .h file? main.cpp? Other files? What you always can try is to distclean and do a cleanbuild. If that does not help. gdb is your friend. Or should be soon.

[giusepped]

This is the header

class QSplitter;
class QTextEdit;
class QTableView;
 
/**
	@author giuseppe <giuseppe@localhost.localdomain>
*/
class mainWindow: public QMainWindow {
	Q_OBJECT
public:
   mainWindow(QWidget *parent = 0);
 
    ~mainWindow();
 
 
 
 
 
 
 
	QSplitter *mainSplitter;
	QTextEdit *detailsText;
	QTableView *listTable;		
};
 
#endif

class QSplitter;
class QTextEdit;
class QTableView;
 
/**
	@author giuseppe <giuseppe@localhost.localdomain>
*/
class mainWindow: public QMainWindow {
	Q_OBJECT
public:
   mainWindow(QWidget *parent = 0);

    ~mainWindow();

 


 
	
	
	QSplitter *mainSplitter;
	QTextEdit *detailsText;
	QTableView *listTable;		
};

#endif

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If I put

QTableView *listTable    = new QTableView

QTableView *listTable    = new QTableView

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no seg faults appear
I don't understand

[Kumosan]

no seg faults appear
I don't understand

Me neither. Should make no difference. In both cases the default constructor should be executed and the same object be created. Can you produce a stacktrace?

[lyuts]

I have the following code which compiles:

#include "mainwindow.h"
#include <QtGui>
mainWindow::mainWindow(QWidget *parent): QMainWindow(parent)
{
	detailsText  = new QTextEdit();
	listTable    = new QTableView();
	mainSplitter = new QSplitter(Qt::Horizontal,this);
	mainSplitter->addWidget(listTable);
	mainSplitter->addWidget(detailsText);
	setCentralWidget(mainSplitter);
}
 
 
mainWindow::~mainWindow()
{
}

#include "mainwindow.h"
#include <QtGui>
mainWindow::mainWindow(QWidget *parent): QMainWindow(parent)
{
	detailsText  = new QTextEdit();
	listTable    = new QTableView();
	mainSplitter = new QSplitter(Qt::Horizontal,this);
	mainSplitter->addWidget(listTable);
	mainSplitter->addWidget(detailsText);
	setCentralWidget(mainSplitter);
}


mainWindow::~mainWindow()
{
}

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But the execution fires a seg fault. Why?

Looks like the seg fault occurs while doing mainSplitter->addWidget(listTable); It would be great to see stacktrace.

[giusepped]

How to do a stacktrace?
g

[Kumosan]

On Linux: gdb -c core <application> and then 'bt'. On Windows....who knows and cares.