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Thread: What's wrong??

  1. #1
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    Question What's wrong??

    I have a Segmentation-fault problem in my program but i don't understand the why(perhaps is a Qt bug!!)

    This is my debug:
    Qt Code:
    1. Program received signal SIGSEGV, Segmentation fault.
    2. [Switching to Thread -1226594624 (LWP 7388)]
    3. QGraphicsItem::setPos (this=0xffece9d8, pos=@0xbf9c2f60)
    4. at graphicsview/qgraphicsitem.cpp:2053
    5. 2053 graphicsview/qgraphicsitem.cpp: No such file or directory.
    6. in graphicsview/qgraphicsitem.cpp
    7. (gdb) bt
    8. #0 QGraphicsItem::setPos (this=0xffece9d8, pos=@0xbf9c2f60)
    9. at graphicsview/qgraphicsitem.cpp:2053
    10. #1 0x08096f11 in MarginDialog::on_spinBox_3_valueChanged ()
    11. #2 0x080a3dfb in MarginDialog::qt_metacall ()
    12. #3 0xb7312131 in QMetaObject::activate (sender=0x8294fb8,
    13. from_signal_index=<value optimized out>, to_signal_index=34,
    14. argv=<value optimized out>) at kernel/qobject.cpp:3001
    15. #4 0xb73127c2 in QMetaObject::activate (sender=0x8294fb8, m=0xb7f2d04c,
    16. local_signal_index=0, argv=0xbf9c305c) at kernel/qobject.cpp:3071
    17. #5 0xb7d2c623 in QSpinBox::valueChanged (this=0x8294fb8, _t1=10)
    18. at .moc/release-shared/moc_qspinbox.cpp:132
    19. #6 0xb7b36519 in QSpinBoxPrivate::emitSignals (this=0x8295088,
    20. ep=EmitIfChanged, old=@0xbf9c30e8) at widgets/qspinbox.cpp:951
    21. #7 0xb7a8aa0c in QAbstractSpinBoxPrivate::setValue (this=0x8295088,
    22. val=@0xbf9c3140, ep=EmitIfChanged, doUpdate=true)
    23. at widgets/qabstractspinbox.cpp:1645
    24. #8 0xb7b34b4e in QSpinBox::setValue (this=0x8294fb8, value=10)
    25. at widgets/qspinbox.cpp:255
    26. #9 0x08096e9e in MarginDialog::resetSpinBox ()
    27. #10 0x08076f7a in XmlGenerator::parseFile ()
    28. #11 0x0805ecf7 in MainWindow::on_actionOpen_triggered ()
    29. #12 0x080a2f5d in MainWindow::qt_metacall ()
    30. #13 0xb7312131 in QMetaObject::activate (sender=0x813c3b0,
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    I don't see any 0x0 value.............................

  2. #2
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    Default Re: What's wrong??

    What happens in on_spinBox_3_valueChanged()? Do you access some graphics item through a pointer? If yes, are you sure that this pointer is initialized?

  3. #3
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    Default Re: What's wrong??

    Quote Originally Posted by jacek View Post
    What happens in on_spinBox_3_valueChanged()? Do you access some graphics item through a pointer? If yes, are you sure that this pointer is initialized?
    yes, i find the problem(in on_spinBox_3_valueChanged() i used an unnitializer pointer.....)

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