[Paraview] Gathering information about python wrappers

[Erik Anderson]

Hi all,
    I am trying to gather information about the Python-wrapped classes 
provided by the paraview.simple API.  So far, I have a script that uses 
some introspection and gets a lot done, but I'm left with a strange 
abort trap before things complete (in addition to some other strange 
errors).  The following script will reproduce all errors that I've seen 
and cannot explain.

 >>> import paraview.simple as pv
paraview version 3.8.0, Date: 2010-03-26

#  Some modules don't seem to like being instantiated at all...
 >>> forbidden = ["AlltoN", "Balance", "CTHSurface"]

#  Grab all possible objects from the package
 >>> l = dir(pv)

# Just create an object for each module and then destroy it to make sure 
we can get through the list...
 >>> for m in l:

# If it doesn't like being created, just skip it for now.
 >>>   if forbidden.__contains__(m):
 >>>     continue

# Grab a handle to the wrapper
 >>>   mod = getattr(pv, m)

# Make sure it's a createable object.
 >>>   if hasattr(mod, "func_name"):
 >>>     if mod.func_name == "CreateObject":

#  Create it and then delete it... This will eventually be necessary to 
inspect it's class methods.
 >>>       pv_instance = getattr(pv, m)()
 >>>       del pv_instance

One of the questionable errors that does NOT cause the script to fail 
and exit -- I've found that this happens upon instantiation of the Clip 
module (although a handful of others show this as well):

ERROR: In 
/Users/erikanderson/env/ParaView-3.8.0/VTK/Filtering/vtkExecutive.cxx, 
line 756
vtkCompositeDataPipeline (0x10ac101a0): Algorithm 
vtkPVArrayCalculator(0x10ac0dbe0) returned failure for request: 
vtkInformation (0x10ac37ed0)
  Debug: Off
  Modified Time: 182297
  Reference Count: 1
  Registered Events: (none)
  Request: REQUEST_DATA_OBJECT
  FORWARD_DIRECTION: 0
  ALGORITHM_AFTER_FORWARD: 1
  FROM_OUTPUT_PORT: 0



ERROR: In 
/Users/erikanderson/env/ParaView-3.8.0/Servers/Common/vtkPVClassNameInformation.cxx, 
line 47
vtkPVClassNameInformation (0x10ac37e00): Cannot get class name from NULL 
object.

ERROR: In 
/Users/erikanderson/env/ParaView-3.8.0/Servers/ServerManager/vtkSMOutputPort.cxx, 
line 338
vtkSMOutputPort (0x10ac38070): Missing data information.

ERROR: In 
/Users/erikanderson/env/ParaView-3.8.0/VTK/Filtering/vtkExecutive.cxx, 
line 756
vtkCompositeDataPipeline (0x10ac101a0): Algorithm 
vtkPVArrayCalculator(0x10ac0dbe0) returned failure for request: 
vtkInformation (0x10ac37ed0)
  Debug: Off
  Modified Time: 182297
  Reference Count: 1
  Registered Events: (none)
  Request: REQUEST_DATA_OBJECT
  FORWARD_DIRECTION: 0
  ALGORITHM_AFTER_FORWARD: 1
  FROM_OUTPUT_PORT: 0



ERROR: In 
/Users/erikanderson/env/ParaView-3.8.0/Servers/Common/vtkPVDataInformation.cxx, 
line 588
vtkPVDataInformation (0x10ac38280): Could not cast object to a known 
data set: vtkAlgorithmOutput

The fatal error:

terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct NULL not valid
Abort trap

This happens after instantiation of the Ribbon module; however, if I 
skip a few it happens at another one down the line.

Any help on this would be great!
Thanks,
Erik Anderson