About this problem I’ve
been talking about this days, It’s solved, not technologically.
I just updated my osg from
version 1.1 to 1.2 and everything goes well
What I want to know is the
differences between the event handling of version 1.1’s GA and that of version 1.2’s, which fixed my
problem.
Thanks.
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of xiaoshuxing
Sent: Saturday, September 16, 2006
12:49 AM
To: 'osg users'
Subject: RE: [osg-users] qt4osg
exception
I found something about
the “Unhandled exception at virtual address in executable: 0xC0000005:
Access violation reading location virtual address” caused by event handling from the
Microsoft msdn ----
“http://support.microsoft.com/default.aspx?scid=kb;en-us;811193”
I don’t quite
understand the details of OSG’s event handling, so I don’t know
whether there’s a possibility that this situation may happen.
And the osgqt4 example is
downloaded from “ http://www.openscenegraph.org/osgwiki/pmwiki.php/Community/WindowingToolkits
”, this toolkit didn’t use osgProducer, so I don’t know
whether the events in QT window environment will affect the working of
osgGA::EventQueue.
I’ve established the
scenegraph successfully in Microsoft windows environment, and I found
it’s really convenient to use OSG. Now I’m doing some
transplanting job to the QT environment, I just really don’t know
how to solve this problem. So any help will be great appreciated. Thanks in
advance.
From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Robert Osfield
Sent: Saturday, September 16, 2006
12:12 AM
To: osg users
Subject: Re: [osg-users] qt4osg
exception
Hi,
The osgGA::EventQueue is used in osgProducer, and its usage is fully
multi-threaded, and appears pretty robust in this environment. I would be
very suprised is there is an actual problem with ScopedLock too as its used all
over the OSG and has yet to cause any problems.
This is not to say there might not be bugs in these bits of code, but, it'd
suggest the likelyhood is the bug is elsewhere, and the crash you are seeing is
just a sumptom of this. I'm not familiar with the qt4osg code so can't
comment on this.
Robert.
On 9/15/06,
xiaoshuxing <[EMAIL PROTECTED]>
wrote:
Thanks for replaying
But I've checked that, the eventQueue's ptr is 0x01513b28 and have a size of
two.
Btw, when the unhandled exception window pops up, the top of the call stack
is the insert function of the list.
I've searched the osg mailing list archive, and found that someone else have
the similar problem but had no solutions. Somebody said it might be the
scopelock before the insert of the evenqueue that causes this exception. But
I don't quite understand.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:
[EMAIL PROTECTED]] On Behalf Of
[EMAIL PROTECTED]
Sent: Friday, September 15, 2006 11:46 PM
To: osg users
Subject: Re: [osg-users] qt4osg exception
That looks like you have a null pointer somewhere. Looking at the line of
code, I'd imagine getEventQueue() is returning null, so that'd be the
first thing I'd look at.
John Donovan
Sony Computer Entertainment Europe
http://www.scee.com
[EMAIL PROTECTED]
wrote on 15/09/2006 16:52:41:
> Hi, everyone
> I've been working on creating OSG scenegraph on QT window using the
> osgqt4 example for several days.
> Well, I still can not figure out how to solve this exception.
>
> Whenever it runs to the following statement:
>
> getEventQueue()->takeEvents(events);
>
> the Unhandled exception
> "Unhandled exception at 0x003baf39 in
QTWindow.exe: 0xC0000005:
> Access violation reading location 0x00000003." Happens
>
> Could anyone give me some
clue._______________________________________________
> osg-users mailing list
> osg-users@openscenegraph.net
> http://openscenegraph.net/mailman/listinfo/osg-users
> http://www.openscenegraph.org/
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