[Paraview-developers] How can I get a proper vtk reader class from a filename with extension

[Jonathan Borduas]

Thank you Utkarsh for your answer.

We choose a IF Statement implementation for now.

Jonathan


From: Utkarsh Ayachit [mailto:utkarsh.ayachit at kitware.com]
Sent: Tuesday, January 17, 2017 4:55 PM
To: Jonathan Borduas <jonathan.borduas at caboma.com>
Cc: paraview-developers at paraview.org
Subject: Re: [Paraview-developers] How can I get a proper vtk reader class from a filename with extension

In all honestly, this is not easy to pull off. Readers in VTK don't have consistent API, as a result it's going to be very tricky to expose properties on this new meta-reader that can work across all readers.

The problem you're specifically facing is that readers like PNGReader (and several others) use meta-readers themselves to support things that the original reader doesn't support e.g. reader file series. Also, `vtkSMReaderFactory::GetReaderName` returns the name for the reader proxy, not the class name for the reader.

Utkarsh

On Tue, Jan 17, 2017 at 11:30 AM, Jonathan Borduas <jonathan.borduas at caboma.com<mailto:jonathan.borduas at caboma.com>> wrote:
Hi Paraviewers,

Got a bit of a challenge here.

I’m trying to create a plugin with a custom reader, that is subclass of a vtkMetaReader, so it can read any file via readers registered with ParaView.

All the implementations I saw use a If statement:

https://github.com/Kitware/ParaView/blob/b41d27999a4ac854f4a0e61d98d09c53e7583a60/ParaViewCore/ClientServerCore/Default/vtkNetworkImageSource.cxx

But I would like to have something in sync with the available readers.

For now I use something similar to:

const char *readerName = readerFactory->GetReaderName();
vtkObject *object = vtkObjectFactory::CreateInstance( readerName );[https://www.upwork.com/messages/rooms/room_38bea0513672a1d805f45ad03c83519e]

But for a .PNG file I receive as readerName “vtkImageFileSeriesReader” instead of "vtkPNGReader".

So basically my question is:

How can I get a proper vtk reader class from a filename with extension?

Thank you very much,

Jonathan Borduas
CTO, Caboma Inc.

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