[Paraview] Possible NetCDF conflict?

[Adriano Gagliardi]

Hi Andy,
 
Well, I managed to get it compiled and working by linking against NetCDF
4.1.1. However, I think it makes sense to remain consistent with the NetCDF
version that ParaView uses, which is what I've done and I've got that
working now as well. I've not had any issues with respect to MPI so far, but
I've still to finish testing. If I find any issues, I'll be sure to repost!
 
Thanks for your help.
 
Adriano

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk 

 

  _____  

From: Andy Bauer [mailto:andy.bauer at kitware.com] 
Sent: 26 May 2011 19:02
To: agagliardi at ara.co.uk
Cc: paraview at paraview.org
Subject: Re: [Paraview] Possible NetCDF conflict?


Hi Adriano,

I wrote the vtkNetCDFCAMReader and I'm using the C++ API to NetCDF in that
reader.  The NcVar::name() method is used in that code.  Instead of using
the standard netcdf c++ header file you can include vtk_netcdfcpp.h instead.
A couple of finer points that may or may not affect you:

1) There may be some issue with including mpi.h and having the netcdf header
files rename some of the mpi constants.

2) The default netcdf error condition (e.g. trying to access a variable that
doesn't exist using get_var() ) is to call exit.   You can do something like
"NcError ncError(NcError::verbose_nonfatal);" to turn this behavior off
while ncError is in scope.

Andy



On Thu, May 26, 2011 at 12:34 PM, Adriano Gagliardi <agagliardi at ara.co.uk>
wrote:



Dear All,

I appear to be getting a conflict between a reader plugin I developed that
handles the NetCDF format and the latest release of ParaView. The call that
is giving me issues is the NcVar function call, name(), which returns a
NcToken (const char *). The issue is that the call now returns a NULL
pointer regardless of dataset, which is wrong.

To be clear:

(1) I have compiled my plugin with the same, static netcdf libraries
consistently between both versions of ParaView.
(2) The reader code has not changed between both versions of ParaView.
(3) All variables exist in the NetCDF files and the data files themselves
have not changed between both versions of ParaView.
(4) By removing the NcVar var->name() call in the code and hard-coding a
variable name that exists in the file (e.g. const char* = "pressure"), the
reader works i.e. it detects the variable, loads it in and displays it
correctly.

Item 4 is what leads me to believe there is now some sort of conflict
occuring between the old (PV3.6.2) and new (3.10.1) versions of ParaView. I
know there is support for specific NetCDF files in ParaView already. If
possible, I'd like to try and compile my plugin against the NetCDF libraries
used for those readers. Can I do this? In the meantime, I'm going to try
downloading and compiling against the latest NetCDF libraries to see if it
resolves the issue.

Thanks,

Adriano

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk


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