QGraphicsView crash... how to debug ?

[pl01]

Hi,

I use the QGraphicsView in my application... and something it crash but I have no idea of the reason.

I only have a stack trace, so if someone has an idea to help me to debug this kind of bug ! If the bug come from my code !!

Any suggestion is welcome

Thx

KernelBase.dll!75f9b727() 	
 	[Frames below may be incorrect and/or missing, no symbols loaded for KernelBase.dll]	
 	KernelBase.dll!75f9b727() 	
 	msvcr90d.dll!free(void * pUserData=0x0042c3a8)  Line 49 + 0xb bytes	C++
 	08520af8()	
>	pureStudio.exe!pureStudio::pgEditor::QNodesView::mouseMoveEvent(QMouseEvent * e=0x0042cf48)  Line 131	C++
 	QtGuid4.dll!QWidget::event(QEvent * event=0x0042cf48)  Line 8186	C++
 	QtGuid4.dll!QFrame::event(QEvent * e=0x0042cf48)  Line 557 + 0xc bytes	C++
 	QtGuid4.dll!QAbstractScrollArea::viewportEvent(QEvent * e=0x0042cf48)  Line 1043 + 0xc bytes	C++
 	QtGuid4.dll!QGraphicsView::viewportEvent(QEvent * event=0x0042cf48)  Line 2865	C++
 	QtGuid4.dll!QAbstractScrollAreaPrivate::viewportEvent(QEvent * event=0x0042cf48)  Line 100 + 0x28 bytes	C++
 	QtGuid4.dll!QAbstractScrollAreaFilter::eventFilter(QObject * o=0x00727370, QEvent * e=0x0042cf48)  Line 116 + 0x29 bytes	C++
 	QtCored4.dll!QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject * receiver=0x00727370, QEvent * event=0x0042cf48)  Line 847 + 0x15 bytes	C++
 	QtGuid4.dll!QApplicationPrivate::notify_helper(QObject * receiver=0x00727370, QEvent * e=0x0042cf48)  Line 4441 + 0x11 bytes	C++
 	QtGuid4.dll!QApplication::notify(QObject * receiver=0x00727370, QEvent * e=0x0042cf48)  Line 4006 + 0x2f bytes	C++
 	QtCored4.dll!QCoreApplication::notifyInternal(QObject * receiver=0x00727370, QEvent * event=0x0042cf48)  Line 732 + 0x15 bytes	C++
 	QtCored4.dll!QCoreApplication::sendSpontaneousEvent(QObject * receiver=0x00727370, QEvent * event=0x0042cf48)  Line 218 + 0x38 bytes	C++
 	QtGuid4.dll!QApplicationPrivate::sendMouseEvent(QWidget * receiver=0x00727370, QMouseEvent * event=0x0042cf48, QWidget * alienWidget=0x00727370, QWidget * nativeWidget=0x006f5920, QWidget * * buttonDown=0x65d27b8c, QPointer<QWidget> & lastMouseReceiver={...}, bool spontaneous=true)  Line 3103 + 0xe bytes	C++
 	QtGuid4.dll!QETWidget::translateMouseEvent(const tagMSG & msg={...})  Line 3321 + 0x2a bytes	C++
 	QtGuid4.dll!QtWndProc(HWND__ * hwnd=0x00010eea, unsigned int message=512, unsigned int wParam=1, long lParam=10879919)  Line 1659 + 0xc bytes	C++
 	user32.dll!76b36238() 	
 	user32.dll!76b368ea() 	
 	user32.dll!76b36899() 	
 	user32.dll!76b36941() 	
 	user32.dll!76b37d31() 	
 	user32.dll!76b37dfa() 	
 	QtCored4.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 807	C++
 	QtGuid4.dll!QGuiEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 1170 + 0x15 bytes	C++
 	QtCored4.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 150	C++
 	QtCored4.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 201 + 0x2d bytes	C++
 	QtCored4.dll!QCoreApplication::exec()  Line 1009 + 0x15 bytes	C++
 	QtGuid4.dll!QApplication::exec()  Line 3720	C++
 	pureStudio.exe!main(int argc=3, char * * argv=0x002a7358)  Line 72 + 0x6 bytes	C++
 	pureStudio.exe!WinMain(HINSTANCE__ * instance=0x00b80000, HINSTANCE__ * prevInstance=0x00000000, char * __formal=0x007b8291, int cmdShow=1)  Line 131 + 0x12 bytes	C++
 	pureStudio.exe!__tmainCRTStartup()  Line 574 + 0x35 bytes	C
 	pureStudio.exe!WinMainCRTStartup()  Line 399	C
 	kernel32.dll!76333677() 	
 	ntdll.dll!776f9d72() 	
 	ntdll.dll!776f9d45()

KernelBase.dll!75f9b727() 	
 	[Frames below may be incorrect and/or missing, no symbols loaded for KernelBase.dll]	
 	KernelBase.dll!75f9b727() 	
 	msvcr90d.dll!free(void * pUserData=0x0042c3a8)  Line 49 + 0xb bytes	C++
 	08520af8()	
>	pureStudio.exe!pureStudio::pgEditor::QNodesView::mouseMoveEvent(QMouseEvent * e=0x0042cf48)  Line 131	C++
 	QtGuid4.dll!QWidget::event(QEvent * event=0x0042cf48)  Line 8186	C++
 	QtGuid4.dll!QFrame::event(QEvent * e=0x0042cf48)  Line 557 + 0xc bytes	C++
 	QtGuid4.dll!QAbstractScrollArea::viewportEvent(QEvent * e=0x0042cf48)  Line 1043 + 0xc bytes	C++
 	QtGuid4.dll!QGraphicsView::viewportEvent(QEvent * event=0x0042cf48)  Line 2865	C++
 	QtGuid4.dll!QAbstractScrollAreaPrivate::viewportEvent(QEvent * event=0x0042cf48)  Line 100 + 0x28 bytes	C++
 	QtGuid4.dll!QAbstractScrollAreaFilter::eventFilter(QObject * o=0x00727370, QEvent * e=0x0042cf48)  Line 116 + 0x29 bytes	C++
 	QtCored4.dll!QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject * receiver=0x00727370, QEvent * event=0x0042cf48)  Line 847 + 0x15 bytes	C++
 	QtGuid4.dll!QApplicationPrivate::notify_helper(QObject * receiver=0x00727370, QEvent * e=0x0042cf48)  Line 4441 + 0x11 bytes	C++
 	QtGuid4.dll!QApplication::notify(QObject * receiver=0x00727370, QEvent * e=0x0042cf48)  Line 4006 + 0x2f bytes	C++
 	QtCored4.dll!QCoreApplication::notifyInternal(QObject * receiver=0x00727370, QEvent * event=0x0042cf48)  Line 732 + 0x15 bytes	C++
 	QtCored4.dll!QCoreApplication::sendSpontaneousEvent(QObject * receiver=0x00727370, QEvent * event=0x0042cf48)  Line 218 + 0x38 bytes	C++
 	QtGuid4.dll!QApplicationPrivate::sendMouseEvent(QWidget * receiver=0x00727370, QMouseEvent * event=0x0042cf48, QWidget * alienWidget=0x00727370, QWidget * nativeWidget=0x006f5920, QWidget * * buttonDown=0x65d27b8c, QPointer<QWidget> & lastMouseReceiver={...}, bool spontaneous=true)  Line 3103 + 0xe bytes	C++
 	QtGuid4.dll!QETWidget::translateMouseEvent(const tagMSG & msg={...})  Line 3321 + 0x2a bytes	C++
 	QtGuid4.dll!QtWndProc(HWND__ * hwnd=0x00010eea, unsigned int message=512, unsigned int wParam=1, long lParam=10879919)  Line 1659 + 0xc bytes	C++
 	user32.dll!76b36238() 	
 	user32.dll!76b368ea() 	
 	user32.dll!76b36899() 	
 	user32.dll!76b36941() 	
 	user32.dll!76b37d31() 	
 	user32.dll!76b37dfa() 	
 	QtCored4.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 807	C++
 	QtGuid4.dll!QGuiEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 1170 + 0x15 bytes	C++
 	QtCored4.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 150	C++
 	QtCored4.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 201 + 0x2d bytes	C++
 	QtCored4.dll!QCoreApplication::exec()  Line 1009 + 0x15 bytes	C++
 	QtGuid4.dll!QApplication::exec()  Line 3720	C++
 	pureStudio.exe!main(int argc=3, char * * argv=0x002a7358)  Line 72 + 0x6 bytes	C++
 	pureStudio.exe!WinMain(HINSTANCE__ * instance=0x00b80000, HINSTANCE__ * prevInstance=0x00000000, char * __formal=0x007b8291, int cmdShow=1)  Line 131 + 0x12 bytes	C++
 	pureStudio.exe!__tmainCRTStartup()  Line 574 + 0x35 bytes	C
 	pureStudio.exe!WinMainCRTStartup()  Line 399	C
 	kernel32.dll!76333677() 	
 	ntdll.dll!776f9d72() 	
 	ntdll.dll!776f9d45()

To copy to clipboard, switch view to plain text mode 

[high_flyer]

Run the application in a debugger, you will then be able to see exactly on which line it is crashing.

[pl01]

It is in the debugger !!! :-P The problem is that it show me some QT code I don't understand... and not sure why and when it do this crash !

[high_flyer]

The post the code where it crashes with few lines before the crashing line it self.