dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

Thanks. Maybe we can fix this in the same way as Garth has done with
the VTK format and make sure that a file is always complete after each
write. This is also good if you are running a long computation and
want to monitor the output and perhaps kill the process but still be
able to use the data generated so far.

We have the same thing in the OpenDX format, but Garth's solution for
the VTK format is nicer: remember the position from before the footer
from the previous write and start from there at the next write.

Does anyone have time to fix? Otherwise I will take a look later.

/Anders


On Fri, Feb 24, 2006 at 02:29:43PM +0000, Alexander Jarosch wrote:
> Yes I read from the file I previously wrote like:
> 
>  File meshout("outmesh.xml");
>  meshout << mesh;
> 
>  Mesh mesh2;
>  File meshin("outmesh.xml");
>  meshin >> mesh2;
> 
> I was just testing the io in one run, should be possible in principle, 
> right. but not if the object has to be destroyed to write everything. A 
> similar example of mesh io is in the user manual. but I know, it's 
> always hard to keep up the documentation :-), but the mailing list is 
> great, good response if one is developing something with dolfin.
> 
> Alex
> 
> Anders Logg wrote:
> 
> >Yes of course, together with a thousand other things we also need to
> >document... :-)
> >
> >How did you manage to not have the object destroyed? Are you reading
> >from the same file object that you previously wrote to, or opening the
> >same file twice, once for writing and then for reading, with the first
> >object still existing when the second is opened?
> >
> >/Anders
> >
> >
> >On Fri, Feb 24, 2006 at 12:56:58PM +0000, Alexander Jarosch wrote:
> > 
> >
> >>Okay fine, thanks, maybe this should find it's way into the user manual 
> >>of dolfin.
> >>
> >>Alex
> >>
> >>Johan Jansson wrote:
> >>
> >>   
> >>
> >>>On Fri, Feb 24, 2006 at 12:28:13PM +0000, Alexander Jarosch wrote:
> >>>
> >>>
> >>>     
> >>>
> >>>>I just want to report a bug in XMLFile.cpp. no matter what type of data 
> >>>>I write to a xml file, vector, matrix, Function, it will not close the 
> >>>>file with the needed </dolfin>.
> >>>>
> >>>>So upon readin of any xml file, mesh included, dolfin fails because it 
> >>>>does not find the end of the file.
> >>>>I did not look deeply into that just made a quick hack so I can work. I 
> >>>>added the writeFooter(); into each write out section, but now I get a 
> >>>>double </dolfin> at the end.
> >>>>
> >>>>Alex
> >>>>
> >>>> 
> >>>>
> >>>>       
> >>>>
> >>>Hi!
> >>>
> >>>The footer is written in the destructor of XMLFile, so it should
> >>>always be written unless you manage to avoid destroying the file
> >>>object.
> >>>
> >>>The reason the footer is not written out in each write operation is
> >>>that you might want to write several objects to the same file, a mesh
> >>>and a vector for example. Currently, the only way DOLFIN can tell that
> >>>a user has finished writing is at the destructor.
> >>>
> >>>Johan
> >>>
> >>>
> >>>_______________________________________________
> >>>DOLFIN-dev mailing list
> >>>DOLFIN-dev@xxxxxxxxxx
> >>>http://www.fenics.org/cgi-bin/mailman/listinfo/dolfin-dev
> >>>
> >>>
> >>>
> >>>     
> >>>
> >>   
> >>
> >
> > 
> >
> 
> 

-- 
Anders Logg
Research Assistant Professor
Toyota Technological Institute at Chicago
http://www.tti-c.org/logg/