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Qt 5.0.2 & 5.1.0 Drag and Drop crash

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  • S Offline
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    SoulSharer
    wrote on 13 Apr 2013, 20:55 last edited by
    #7

    Ok, I've managed to load in .pdb and here is a callstack, now it looks useful:

    Updated callstacks:
    http://i.imgur.com/BAoL8mC.png
    http://i.imgur.com/XIEbyvp.png

    and where it stopped
    http://i.imgur.com/BJdc8SP.png

    • looks like scoped pointer was destroyed or something
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    • S Offline
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      SGaist
      Lifetime Qt Champion
      wrote on 13 Apr 2013, 22:01 last edited by
      #8

      Hi,

      Hope you don't mind me asking that, but would aren't you reinventing the wheel ? Drag and Drop support are already supported in QTableWidget and QListWidget.

      You might better go overloading "QTableWidget::dropMimeData":http://qt-project.org/doc/qt-4.8/qtablewidget.html#dropMimeData and "QListWidget::mimeData":http://qt-project.org/doc/qt-4.8/qlistwidget.html#mimeData

      You would then only have to care about your data.

      Hope it helps

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • S Offline
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        SoulSharer
        wrote on 14 Apr 2013, 06:23 last edited by
        #9

        [quote author="SGaist" date="1365890494"]Hi,

        Hope you don't mind me asking that, but would aren't you reinventing the wheel ? Drag and Drop support are already supported in QTableWidget and QListWidget.

        You might better go overloading "QTableWidget::dropMimeData":http://qt-project.org/doc/qt-4.8/qtablewidget.html#dropMimeData and "QListWidget::mimeData":http://qt-project.org/doc/qt-4.8/qlistwidget.html#mimeData

        You would then only have to care about your data.

        Hope it helps[/quote]

        Didn't know about that, thanks. I might use it for most of the stuff, but I still want to find out what's wrong with current code if possible.

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        • R Offline
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          raven-worx
          Moderators
          wrote on 14 Apr 2013, 09:39 last edited by
          #10

          This code looks good so far ... the problem must be somewhere else.

          --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
          If you have a question please use the forum so others can benefit from the solution in the future

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          • B Offline
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            bodzio131
            wrote on 14 Apr 2013, 09:51 last edited by
            #11

            Do you manage QObject descendants by yourself? Maybe you delete such objects directly (instead of deleteLater) or you use smart pointers with such objects. It could be a real problem if you interfere with Qt objects management model.

            I think you need to narrow your project by cutting whatever you can step by step, or try to use the same drag-drop logic in simpler app. However, I suppose the problem can be far away from part which shows crash :(

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            • S Offline
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              SoulSharer
              wrote on 14 Apr 2013, 10:37 last edited by
              #12

              Thanks for the help.

              [quote author="Bogdan" date="1365933102"]Do you manage QObject descendants by yourself? Maybe you delete such objects directly (instead of deleteLater) or you use smart pointers with such objects. It could be a real problem if you interfere with Qt objects management model.

              I think you need to narrow your project by cutting whatever you can step by step, or try to use the same drag-drop logic in simpler app. However, I suppose the problem can be far away from part which shows crash :([/quote]

              No I don't manage anything related to QObject myself and don't use smart pointers at all. The maximum I do is subclassing existing widgets to reimplement drag and drop actions.

              And yeah I will try to cut it into something testable.

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              • S Offline
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                SoulSharer
                wrote on 16 Apr 2013, 09:00 last edited by
                #13

                For some reason in notifyInternal() receiver is NULL (0) after dropping, which causes all of this. Still trying to recreate this issue.

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                • R Offline
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                  raven-worx
                  Moderators
                  wrote on 16 Apr 2013, 09:04 last edited by
                  #14

                  this means that you probably deleting objects before the drag has finished.
                  Or creating them on the wrong storage location (e.g. stack).

                  --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                  If you have a question please use the forum so others can benefit from the solution in the future

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                  • S Offline
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                    SoulSharer
                    wrote on 16 Apr 2013, 09:17 last edited by
                    #15

                    Thing is I don't allocate on stack or delete them at all, my windows are allocated on heap and are not deleted until main window closes.
                    -Checked it once more, everything alright

                    Could it be because of some broken relationship between QMainWindows or QWidgets?

                    And Dropping does work if I don't do it fast, if I do it fast it gets reciever that is null and so it crashes.

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                    • R Offline
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                      raven-worx
                      Moderators
                      wrote on 16 Apr 2013, 09:56 last edited by
                      #16

                      Hard to tell if you can't show more code...

                      --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                      If you have a question please use the forum so others can benefit from the solution in the future

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                      • S Offline
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                        SoulSharer
                        wrote on 16 Apr 2013, 16:34 last edited by
                        #17

                        Never mind, thanks for help anyway.

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                        • W Offline
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                          wizzhard
                          wrote on 18 Aug 2013, 11:20 last edited by
                          #18

                          Hello,

                          I also experience a crash during drag n drop with the very same callstack after the crash.

                          In my case the crash occurs in a qtreeview when i drag n drop item internally.

                          In fact everything works fine until I double click an item of the view to rename it.

                          1 - I fill the item delegate with the new name
                          2 - Press enter to validate
                          3 - setData of the model is called (but does nothing).
                          4 - I try to drag & drop an item
                          5 - dragEnterEvent is called once.
                          6 - dragMoveEvent is called once
                          7 - program crash in QScopedPointer line134

                          @0 QScopedPointer<QObjectData,QScopedPointerDeleter<QObjectData> >::data qscopedpointer.h 134 0x651f1d4a
                          1 qGetPtrHelper<QScopedPointer<QObjectData,QScopedPointerDeleter<QObjectData> > > qglobal.h 991 0x651df58b
                          2 QObject::d_func qobject.h 119 0x651f0323
                          3 QCoreApplication::notifyInternal qcoreapplication.cpp 764 0x65468230
                          4 QCoreApplication::sendSpontaneousEvent qcoreapplication.h 206 0x65577098
                          5 QWidgetWindow::handleDropEvent qwidgetwindow.cpp 566 0x65d3e759
                          6 QWidgetWindow::event qwidgetwindow.cpp 195 0x65d3d30c
                          7 QApplicationPrivate::notify_helper qapplication.cpp 3398 0x65cc291e
                          8 QApplication::notify qapplication.cpp 2829 0x65cc035a
                          9 QCoreApplication::notifyInternal qcoreapplication.cpp 767 0x65468264
                          10 QCoreApplication::sendEvent qcoreapplication.h 203 0x6546d5e9
                          11 QGuiApplicationPrivate::processDrop qguiapplication.cpp 2228 0x66673045
                          12 QWindowSystemInterface::handleDrop qwindowsysteminterface.cpp 556 0x6665860c
                          13 QWindowsOleDropTarget::Drop qwindowsdrag.cpp 683 0x64eef4dd
                          14 CPrivDragDrop::PrivDragDrop getif.cxx 960 0x770f2b79
                          15 PrivDragDrop getif.cxx 1099 0x770f2d78
                          16 CDropTarget::Drop drag.cpp 2492 0x770ca04d
                          17 CDragOperation::CompleteDrop drag.cpp 1601 0x770c9ede
                          18 DoDragDrop drag.cpp 1964 0x770ca8dd
                          19 QWindowsDrag::drag qwindowsdrag.cpp 802 0x64eef9fa
                          20 QDragManager::drag qdnd.cpp 143 0x666831c8
                          21 QDrag::exec qdrag.cpp 282 0x66681daa
                          22 QAbstractItemView::startDrag qabstractitemview.cpp 3581 0x65faf1a5
                          23 QAbstractItemView::mouseMoveEvent qabstractitemview.cpp 1761 0x65fa9d9b
                          24 QTreeView::mouseMoveEvent qtreeview.cpp 1924 0x65ff6a8b
                          25 QWidget::event qwidget.cpp 7842 0x65d0a0ed
                          26 QFrame::event qframe.cpp 534 0x65e67772
                          27 QAbstractScrollArea::viewportEvent qabstractscrollarea.cpp 1163 0x65f089c4
                          28 QAbstractItemView::viewportEvent qabstractitemview.cpp 1680 0x65fa971b
                          29 QTreeView::viewportEvent qtreeview.cpp 1260 0x65ff3ece
                          30 QAbstractScrollAreaPrivate::viewportEvent qabstractscrollarea_p.h 105 0x65caaf28
                          31 QAbstractScrollAreaFilter::eventFilter qabstractscrollarea_p.h 121 0x65f0a919
                          32 QCoreApplicationPrivate::sendThroughObjectEventFilters qcoreapplication.cpp 863 0x654684f3
                          33 QApplicationPrivate::notify_helper qapplication.cpp 3394 0x65cc2902
                          34 QApplication::notify qapplication.cpp 2962 0x65cc098c
                          35 QCoreApplication::notifyInternal qcoreapplication.cpp 767 0x65468264
                          36 QCoreApplication::sendSpontaneousEvent qcoreapplication.h 206 0x65577098
                          37 QApplicationPrivate::sendMouseEvent qapplication.cpp 2469 0x65cbfab5
                          38 QWidgetWindow::handleMouseEvent qwidgetwindow.cpp 403 0x65d3dd00
                          39 QWidgetWindow::event qwidgetwindow.cpp 155 0x65d3d274
                          40 QApplicationPrivate::notify_helper qapplication.cpp 3398 0x65cc291e
                          41 QApplication::notify qapplication.cpp 2829 0x65cc035a
                          42 QCoreApplication::notifyInternal qcoreapplication.cpp 767 0x65468264
                          43 QCoreApplication::sendSpontaneousEvent qcoreapplication.h 206 0x65577098
                          44 QGuiApplicationPrivate::processMouseEvent qguiapplication.cpp 1417 0x6666ffe4
                          45 QGuiApplicationPrivate::processWindowSystemEvent qguiapplication.cpp 1249 0x6666f852
                          46 QWindowSystemInterface::sendWindowSystemEventsImplementation qwindowsysteminterface.cpp 536 0x66658561
                          47 QWindowSystemInterface::sendWindowSystemEvents qwindowsysteminterface.cpp 516 0x666584e9
                          48 QWindowsGuiEventDispatcher::sendPostedEvents qwindowsguieventdispatcher.cpp 86 0x64ecc014
                          49 qt_internal_proc qeventdispatcher_win.cpp 423 0x654f08d7
                          50 InternalCallWinProc USER32 0x766662fa
                          51 UserCallWinProcCheckWow USER32 0x76666d3a
                          52 DispatchMessageWorker USER32 0x766677c4
                          53 DispatchMessageW USER32 0x7666788a
                          54 QEventDispatcherWin32::processEvents qeventdispatcher_win.cpp 744 0x654f19c3
                          55 QWindowsGuiEventDispatcher::processEvents qwindowsguieventdispatcher.cpp 78 0x64ecbf7e
                          56 QEventLoop::processEvents qeventloop.cpp 137 0x65464ea1
                          57 QEventLoop::exec qeventloop.cpp 212 0x65464ffe
                          58 QCoreApplication::exec qcoreapplication.cpp 1020 0x6546879d
                          59 QGuiApplication::exec qguiapplication.cpp 1184 0x6666f5e8
                          60 QApplication::exec qapplication.cpp 2674 0x65cc0009
                          61 main main.cpp 20 0xbaf6fe
                          62 WinMain qtmain_win.cpp 131 0xc5f5ea
                          63 __tmainCRTStartup crtexe.c 547 0xc5d440
                          64 WinMainCRTStartup crtexe.c 371 0xc5d1cf
                          65 BaseThreadInitThunk kernel32 0x775f33aa
                          66 __RtlUserThreadStart ntdll32 0x77bd9f72
                          67 _RtlUserThreadStart ntdll32 0x77bd9f45 @

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                          • W Offline
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                            wizzhard
                            wrote on 18 Aug 2013, 12:59 last edited by
                            #19

                            I just found something that seems to fix the issue here.

                            http://stackoverflow.com/questions/17373591/qt5-custom-lineedit-widget-qlineedit-subclass-private-variable-crashes-applica

                            I have unchecked acceptDrop on the qtreeview that own the items and it doesn't crash anymore.

                            EDIT : it doesn't works finally, it was the interruption of the debugger that prevented the problem to occur by interrupting the item delegate validation.

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                            • S Offline
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                              SoulSharer
                              wrote on 19 Aug 2013, 16:30 last edited by
                              #20

                              Well, I've updated to 5.1.0, it still crashes. But now it also outputs this:

                              bq. QAccessibleTree::indexFromLogical: invalid index: 1 0 for QTreeWidget(0x4b06408)
                              Cannot creat accessible child interface for object: QTreeWidget(0x4b06408) index: 1
                              QAccessibleTree::indexFromLogical: invalid index: 2 0 for LayersTreeWidget(0x4a69668, name = "treeWidget")
                              Cannot creat accessible child interface for object: LayersTreeWidget(0x4a69668, name = "treeWidget") index: 2
                              QAccessibleTree::indexFromLogical: invalid index: 2 0 for LayersTreeWidget(0x4a69668, name = "treeWidget")
                              Cannot creat accessible child interface for object: LayersTreeWidget(0x4a69668, name = "treeWidget") index: 2
                              First-chance exception at 0x74c2c41f in JOI_Editor.exe: 0x80010001: Вызов был отклонен.
                              QAccessibleTree::indexFromLogical: invalid index: 3 0 for LayersTreeWidget(0x4a69668, name = "treeWidget")
                              Cannot creat accessible child interface for object: LayersTreeWidget(0x4a69668, name = "treeWidget") index: 3
                              First-chance exception at 0x6631232a in JOI_Editor.exe: 0xC0000005: Access violation reading location 0x00000004.
                              Unhandled exception at 0x770815de in JOI_Editor.exe: 0xC0000005: Access violation reading location 0x00000004.
                              The program '[7544] JOI_Editor.exe: Native' has exited with code -1073741819 (0xc0000005).

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                                wizzhard
                                wrote on 20 Aug 2013, 17:41 last edited by
                                #21

                                I have debugged a little in qt's code and there is something weird.

                                Before I rename an item everything works fine and the function QWindowsOleDropTarget::Drop qwindowsdrag.cpp 683 is called only when I release the mouse button over the item I want to do the drop on.
                                After I have renamed an item I start a drag, the dragEnterEvent occurs one time, then dragMoveEvent occurs one time too and the program crashes under QWindowsOleDropTarget::Drop qwindowsdrag.cpp 683 but I never released the button so this drop should not have occured.
                                If , after I renamed an item (so the app should crash the next time I drag an item in the treeview), I open an explorer windows, start to drag an item in it and press escape to cancel the drag then come back to my application and start a drag I don't crash and everything works fine.

                                I am on Windows 7 x64 with Qt 5.1.0 (vs2010)

                                QtCreator designer has a very similar problem, I can't drag widget from the toolbox until I canceled a drag with ESC in an explorer window. If I delete a widget in the designer the pb reappear and I must cancel a drag again in an explorer window.

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                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on 20 Aug 2013, 20:56 last edited by
                                  #22

                                  Hi,

                                  Can you write a little test program showing the problem ? You could then open a "bug report":http://bugreports.qt-project.org/issues/ with it

                                  Interested in AI ? www.idiap.ch
                                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                    smartopworks
                                    wrote on 21 Dec 2013, 08:41 last edited by
                                    #23

                                    The issue still exists in QT 5.2 for Ubuntu and it does not only affect QTreeView but also the QPlainTextEdit affected or others.

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                                      smartopworks
                                      wrote on 21 Dec 2013, 08:43 last edited by
                                      #24

                                      https://bugreports.qt-project.org/browse/QTBUG-33057

                                      I think it should be the same one.

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                                        jrondanv
                                        wrote on 12 Feb 2014, 17:09 last edited by
                                        #25

                                        i have the same problem, in this link explain more about that.
                                        https://bugreports.qt-project.org/browse/QTBUG-33635?focusedCommentId=229983&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-229983

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