[SOLVED] QLabel and Segmentation fault...

[Lykurg]

Hi,

I have completely rebuild my project but get still a segmentation fault. I don't understand why, because the "setText()" works in the constructor but not in the function? Here is the relevant code:

#include <QWidget>
#include <QtGui>
 
class MyGraphicView : public QWidget
  {
    Q_OBJECT
 
    public:
      MyGraphicView(QWidget *parent = 0);
 
    private:
      void updateImageInformation();
 
      QLabel *info_filesize;
  };
 
 
//////////////////////// CPP-File ////////////////////////
 
#include "MyGraphicView.h"
 
#include <QtGui>
 
MyGraphicView::MyGraphicView(QWidget *parent) :
  QWidget(parent)
  {
    [...]
    info_filesize = new QLabel(this);
    [...]
    info_filesize->setText("KB"); // <- works!!!
  }
 
void MyGraphicView::updateImageInformation()
  {
    info_filesize->setText("----"); // <- SIGSEGV
  }

#include <QWidget>
#include <QtGui>

class MyGraphicView : public QWidget
  {
    Q_OBJECT

    public:
      MyGraphicView(QWidget *parent = 0);

    private:
      void updateImageInformation();

      QLabel *info_filesize;
  };


//////////////////////// CPP-File ////////////////////////

#include "MyGraphicView.h"

#include <QtGui>

MyGraphicView::MyGraphicView(QWidget *parent) :
  QWidget(parent)
  {
    [...]
    info_filesize = new QLabel(this);
    [...]
    info_filesize->setText("KB"); // <- works!!!
  }

void MyGraphicView::updateImageInformation()
  {
    info_filesize->setText("----"); // <- SIGSEGV
  }

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and GDB says:

(gdb) run
Starting program: /home/lykurg/workspace/cpp/workplace/ganesha/ganesha
[Thread debugging using libthread_db enabled]
[New Thread -1224829232 (LWP 9063)]
 
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1224829232 (LWP 9063)]
QLabel::setText (this=0x2f006c, text=@0xbf828400) at widgets/qlabel.h:154
154     widgets/qlabel.h: No such file or directory.
        in widgets/qlabel.h
Current language:  auto; currently c++

(gdb) run
Starting program: /home/lykurg/workspace/cpp/workplace/ganesha/ganesha
[Thread debugging using libthread_db enabled]
[New Thread -1224829232 (LWP 9063)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1224829232 (LWP 9063)]
QLabel::setText (this=0x2f006c, text=@0xbf828400) at widgets/qlabel.h:154
154     widgets/qlabel.h: No such file or directory.
        in widgets/qlabel.h
Current language:  auto; currently c++

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When I comment the "setText()" in updateImageInformation() out, the program starts and executes the constructor-setText without any problems.


Thanks,

Lykurg