Ask for help: exception at 0x6549960a (QtGuid4.dll)

Hello,

I compiled my Qt application with 4.5.0 rc-1 and had the following exception:

Unhandled exception at 0x6549960a (QtGuid4.dll) in myApp.exe: 0xC0000005: Access violation reading location 0xfeeeff9a.


I didn't have such problem with 4.4.3. I copied the call stack as following. Could anyone help me with this problem and what to do? Is it a bug in 4.5.0 rc-1?

thank you!

Code:

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>	QtGuid4.dll!QMenu::findIdForAction(QAction * act=0x02c5cc78)  Line 3152 + 0x8	C++
 	QtGuid4.dll!QMenuPrivate::activateCausedStack(const QList<QPointer<QWidget> > & causedStack={...}, QAction * action=0x02c5cc78, QAction::ActionEvent action_e=Trigger, bool self=true)  Line 960 + 0x13	C++
 	QtGuid4.dll!QMenuPrivate::activateAction(QAction * action=0x02c5cc78, QAction::ActionEvent action_e=Trigger, bool self=true)  Line 1056	C++
 	QtGuid4.dll!QMenu::mouseReleaseEvent(QMouseEvent * e=0x0012c03c)  Line 2249	C++
 	QtGuid4.dll!QWidget::event(QEvent * event=0x0012c03c)  Line 7512	C++
 	QtGuid4.dll!QMenu::event(QEvent * e=0x0012c03c)  Line 2347	C++
 	QtGuid4.dll!QApplicationPrivate::notify_helper(QObject * receiver=0x02d803b8, QEvent * e=0x0012c03c)  Line 4051 + 0xf	C++
 	QtGuid4.dll!QApplication::notify(QObject * receiver=0x02d803b8, QEvent * e=0x0012c03c)  Line 3753 + 0x2f	C++
 	QtCored4.dll!QCoreApplication::notifyInternal(QObject * receiver=0x02d803b8, QEvent * event=0x0012c03c)  Line 594 + 0x13	C++
 	QtCored4.dll!QCoreApplication::sendSpontaneousEvent(QObject * receiver=0x02d803b8, QEvent * event=0x0012c03c)  Line 211 + 0x38	C++
 	QtGuid4.dll!QApplicationPrivate::sendMouseEvent(QWidget * receiver=0x02d803b8, QMouseEvent * event=0x0012c03c, QWidget * alienWidget=0x00000000, QWidget * nativeWidget=0x02d803b8, QWidget * * buttonDown=0x65b23c80, QPointer<QWidget> & lastMouseReceiver={...})  Line 2913 + 0xe	C++
 	QtGuid4.dll!QETWidget::translateMouseEvent(const tagMSG & msg={...})  Line 3166 + 0x28	C++
 	QtGuid4.dll!QtWndProc(HWND__ * hwnd=0x00050bfa, unsigned int message=514, unsigned int wParam=0, long lParam=6029582)  Line 1669 + 0xc	C++
 	user32.dll!7e418734() 	
 	user32.dll!7e418816() 	
 	user32.dll!7e4189cd() 	
 	ntdll.dll!7c915d27() 	
 	ntdll.dll!7c915d27() 	
 	user32.dll!7e418a10() 	
 	QtCored4.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 746 + 0x17	C++
 	QtGuid4.dll!QGuiEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 1177 + 0x15	C++
 	QtCored4.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 145	C++
 	QtCored4.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...})  Line 195 + 0x2d	C++
 	QtCored4.dll!QCoreApplication::exec()  Line 872 + 0x15	C++
 	QtGuid4.dll!QApplication::exec()  Line 3527	C++
 	myApp.exe!main(int argc=2, char * * argv=0x02aa6d68)  Line 182 + 0x6	C++
 	myApp.exe!WinMain(HINSTANCE__ * instance=0x00400000, HINSTANCE__ * prevInstance=0x00000000, char * __formal=0x00141f07, int cmdShow=1)  Line 133 + 0x12	C++
 	myApp.exe!WinMainCRTStartup()  Line 390 + 0x39	C
 	kernel32.dll!7c817067() 	
 	ntdll.dll!7c915d27()

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It would be better to see the code with marked line where the error appears.

The problem is that I don't know where the error happens in my code. From the track stack, it is from the QtGuid4.dll.

I have no idea where to start ...:(

Hi richardander,

from line 26 in your post

Code:

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myApp.exe!main(int argc=2, char * * argv=0x02aa6d68)  Line 182 + 0x6    C++

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I would guess that you are passing an argument to your programm. First of all I would try to not pass any arguments to the application and see what is happening.

argc => argument count
the number of arguments passed to the application from the command line. the first argument is always the executables name.

Then it would be helpfull if you could show us how you start your application, e.g.

Code:

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myApp.exe firstArgument

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Taurho