[vtkusers] catching VTK errors

[Mathieu Malaterre]

Hi Mark,

  You did it the correct VTK way (=no exception), you need to observe
ErrorEvent. A nice trick you can use globally for your application is
to observe ErrorEvent on the vtkOutputWindow (it's designed so that
there is only one instance per process).

HTH
-Mathieu

On 8/7/07, Mark Wyszomierski <markww at gmail.com> wrote:
> Well after some reading it seems VTK doesn't implement exceptions. So
> I wrote a small observer class and am observing errors and warnings on
> vtkDICOMImageReader. It works, but it seems like such a massive
> solution to what might be just a one line simple if () check statement
> to see if Update() was successful or not.
>
> Have I done this correctly, or is there a simpler solution?
>
> Thanks,
> Mark
>
> On 8/6/07, Mark Wyszomierski <markww at gmail.com> wrote:
> > Hi Mathieu,
> >
> > That's what I'd like to do, I just am not sure how to trap errors. For
> > instance, I'm using vtkDICOMImageReader. The reading of the files
> > occurs when I call Update(). But that call returns void, yet that's
> > where the error occurs and the vtkOutput window pops up at that
> > moment. I'd like to do something like:
> >
> >     try {
> >         pMyDicomReader->Update(); // read all the files
> >     }
> >     catch (vtkDICOMImageReaderError& err)
> >     {
> >          MessageBox(err); // whatever the error is
> >     }
> >
> > Right now I don't seem to have any way to trap simple errors like no
> > DICOM images in the directory etc.
> >
> > Thanks,
> > Mark
> >
> >
> > On 8/6/07, Mathieu Coursolle <mcoursolle at rogue-research.com> wrote:
> > > Hi,
> > >
> > > I am not sure if this is what you are experiencing, but
> > > some text is printed to the output (stdout and/or stderr) when some errors
> > > occur.
> > >
> > > On some platform (ex: Windows), those are set to the console by default,
> > > so a console appears
> > > when something is printed to stdout or stderr.
> > >
> > > A solution would be to redirect those (stdout, stderr) to a temporary
> > > file for example.
> > >
> > > I tried it once and it worked fine.
> > >
> > > Thanks.
> > >
> > > Mathieu
> > >
> > >
> > > --
> > > ____________________________________________________________
> > > Mathieu Coursolle                   mcoursolle at rogue-research.com
> > > Rogue Research                      www.rogue-research.com
> > > Montréal, Québec, Canada
> > >
> > >
> > > >Hi,
> > > >
> > > >How does one catch the vtk debugger window that sometimes pops up when
> > > >an error occurs? I'd like to catch it 'gracefully' and die.
> > > >
> > > >Thanks,
> > > >Mark
> > > >_______________________________________________
> > > >This is the private VTK discussion list.
> > > >Please keep messages on-topic. Check the FAQ at: http://www.vtk.org/Wiki/
> > > >VTK_FAQ
> > > >Follow this link to subscribe/unsubscribe:
> > > >http://www.vtk.org/mailman/listinfo/vtkusers
> > > >
> > >
> > >
> > >
> > >
> >
> _______________________________________________
> This is the private VTK discussion list.
> Please keep messages on-topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>


-- 
Mathieu