Re: [Paraview] Fwd: How to plug into paraview his own writer ?

houssen Wed, 01 Jul 2015 13:51:56 -0700

Hi Cory,

I had to spread my time over several topics these days... So I had not much time to get back to the paraview writer.

I believe I have done pretty much everything for the writer to work but at save time, I still get this error : ~> ERROR: In /home/houssen/Programs/ParaView/ParaView-v4.3.1-source/ParaViewCore/ServerImplementation/Core/vtkSIProxy.cxx, line 307 vtkSIWriterProxy (0x5cc38e0): Failed to create myWriter. Aborting for debugging purposes.

The writer instance is not created for some reason.

At this point, I run paraview, I load the plugin with "tools / manage plugins" (load seems OK), I open some data, I save with "my writer" (I see my writer in the save GUI + I am asked for a file-to-save name), I click OK and then it crahses. I believe the xml file is wrong and / or something is missing... But I didn't yet figured it out. It seems I have no pvserver (see in the mail) : can this trigger the crash ? Do I need a pvserver for the writer to work ?


I answered your question in the mail.

Franck

Le 2015-06-30 6:08, Cory Quammen a écrit :

Hi Franck,

It looks like you've been making progress, so I'll answer your
questions from your second email.

Question 1 : how to write myWriter.xml ?

1.1. seems I must set <InputProperty command="SetInputConnection"
name="Input"> in myWriter.xml. Does this means I will also have to
implement myWriter::SetInputConnection ?


No. Your writer will inherit from subclass of vtkAlgorithm, the class

that defines "SetInputConnection", and you should not need to override

it. XdmfWriter inherits from vtkDataObjectAlgorithm, which itself
inherits vtkAlgorithm.

1.2. seems I must set <StringVectorProperty name="FileName"
command="SetFileName"> in myWriter.xml. Does this means I will also
have to implement myWriter::SetFileName ?


Yes, like vtkXdmfWriter.

 2.2 in myWriter.hpp, I need to derive from a vtkObject this way
(like XdmfWriter.cpp does)

ew (); // Needed to be plugged into paraview
    vtkTypeMacro ( myWriter, vtkDataObjectAlgorithm ); // Needed
to be plugged into paraview
+ suppress copy constructor and operator=

Am I correct ?

Yes.

Question 3 : in myWriter.cpp, on

I am supposed to be called back (to get focus back) when I click the

"save data" button ? Here, how can I get data to be saved (data that I

can see in paraview viewer befo

n ParaView, when you choose, File -> Save Data, the data from the
selected Pipeline Browser object will be saved. This will have some
kind of data type, e.g., vtkImageData, vtkPolyData, etc. What kind
of data type would you like your writer to support?


Structured and likely also unstructured grids


The data should

in the member function myWriter::RequestData(). This is where you
should write your data.

OK (I suppose I'll get vtkStructuredGrid / vtkUnstructuredGrid as vtkObject in myWriter::RequestData according to http://www.vtk.org/Wiki/VTK/Tutorials/New_Pipeline#Typical_Pipeline_Execution)


 Finally, myWriter.xml seems OK. myWriter.*pp compile OK. Paraview
finds myWriter.xml at run time (exporting PV_PLUGIN_PATH) and loads
libmywriter.so without problem. I see the writer in the "save data"
GUI (drop down list with different save formats). I save with

myWriter, I get a (basic) GUI with file name only (no extra parameter)

: I crash when I click "OK, save" with this error message :
 ERROR: In /.../ParaView-v4.3.1-sourc

ailed to create myWriter. Aborting for debugging purposes.

vtkSIWriterProxy does this at line 303 :
vtkObjectBase* obj = this->Interpreter->NewInstance(className);
but obj is NULL.

I get obj is NULL because I missed something in myWriter
implementation : what did I miss ?

Are you running pvserver separately and connecting to it with the
client? If so, make sure PV_PLUGIN_PATH is defined in the
environment in which pvserver is run. Have you tried to load your
plugin through the Tools -> Manage Plugins... dialog?

No I just run a client. I don't need the server : is it necessary for the writer to work ?


~> paraview &
~> ps -aux | grep pvserver

houssen 5315 0.0 0.0 14544 948 pts/0 S+ 22:38 0:00 grep pvserver

~> ps -aux | grep paraview

houssen 5313 16.0 1.1 1175692 179424 pts/0 S 22:38 0:01 /home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/paraview houssen 5317 0.0 0.0 14544 944 pts/0 S+ 22:38 0:00 grep paraview

I hope that helps get you further in writing your data files.

Thanks,
Cory
 
Can somebody help

t me some clue ?

 FH

 -------- Message original --------
 Objet: How to plug into paraview his own writer ?
 Date: 2015-06-12 15:54
 De: houssen <[email protected] [6]>
 À: <[email protected] [7]>

 I followed 2 tutorials (

Links:
------
[1] http://www.kitware.com
[2] http://www.kitware.com/opensource/opensource.html
[3] http://paraview.org/Wiki/ParaView
[4] http://markmail.org/search/?q=ParaView
[5] http://public.kitware.com/mailman/listinfo/paraview
[6] mailto:[email protected]
[7] mailto:[email protected]

myWriter.tar.gz
Description: GNU Zip compressed data

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