Hi Andreas,
> Hi Antonio,
>
> > Hello,
> >
> >
> >>Hi,
> >>
> >>I'm trying to make my application "crash save". As
> >>you might know, the loader sometimes crashes when
> >>loading corrupt files or it sometimes just happens
> >>with obj or 3ds files. So I tried to wrap all the
> >>loader stuff in try catch statements, but they
> >>didn't help either. As I'm not a try-catch guru,
> >>I don't really know what's happening. Some reading
> >>on google suggests me that it might also depend on
> >>how the lib/app was compiled. Has anybody here a
> >>deeper insight about the issue? I just would like
> >>to avoid those hard crashes..... (BTW, I'm talking
> >>about windows...).
> >
> >
> > I tried to debug the application and here's what
> > I found:
> >
> > The loader crashes in osgsimplescenemanager.cpp
> > in the method "readProgress(void * OSG_CHECK_ARG(data))"
> >
> > The funny thing is that there's somehow a race condition,
> > if I set a breakpoint and step through the method it does
> > not crash, if I don't set a breakpoint it does! Also disabling
> > the setReadProgressCB in my application resolves the problem.
> >
> > Perhaps the input stream is closed and removed while the
> > readProgress thread is sleeping in it's while loop?
> >
> > I am loading an obj file with "Invalid d entry in blabla.mtl"
> >
> > Any ideas?
>
> yes the threading code is a bit unsafe. You should add the callback via
> setReadProgressCB(progress, false) this won't create a extra thread but
> it is not implemented for all loaders yet only for osb and wrl. I can
> implement the remaining loaders on friday.
As a workaround the "false" flag works ok also with obj files.
Thank you!
While playing with the loader I made two observations:
When I use the standard loader interface that uses the filename
and load an obj, on some obj files I get an error.
If I instead use the ifstream version and pass him the format
to read, it loads! Here's the code I tested with:
try{
m_pNode = OSG::NullFC;
OSG::SceneFileType *st = osg::SceneFileHandler::the().getFileType(
m_sPath.toStdString().c_str() );
if( st ){
std::ifstream infile;
infile.open (m_sPath.toStdString().c_str(), std::ios::binary);
char nm[16], dummyStr[1024];
sscanf( st->getName(), "%s %s", nm, dummyStr ); // get extension
m_pNode = osg::SceneFileHandler::the().read(infile, nm, graphOperator);
infile.close();
}
}catch( ...){
printf( "exception!\n" );
m_pNode = OSG::NullFC;
}
A second observation is that some 3ds files cause the loader to run
into an endless loop.... (?) Will look into it...
Regards,
Toni
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