[vtkusers] Noisy errors from vtkMINCImageReader when optional dimension attributes are missing

[Elvis Stansvik]

2016-02-24 15:31 GMT+01:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:

> 2016-02-24 14:12 GMT+01:00 David Gobbi <david.gobbi at gmail.com>:
>
>> Hi Elvis,
>>
>> You can silence all errors by adding an observer for the ErrorEvent.
>>
>> def observer(obj, event):
>>     pass
>>
>> reader.AddObserver(vtk.vtkCommand.ErrorEvent, observer)
>>
>> This will cause all errors to be redirected to the observer.
>>
>
> Hm, I gave this a shot with
>
> def _handleMINCError(obj, event):
>     pass
>
> at module level and then
>
>         self.reader = vtkMINCImageReader()
>         self.reader.AddObserver(vtkCommand.ErrorEvent, _handleMINCError)
>         ...
>
> where I create the reader, but I'm still getting the errors printed.
>
> I also tried with the string variant, using 'ErrorEvent' instead of
> vtkCommand.ErrorEvent, and also giving a higher priority than the default
> 0.0.
>
> Do things printed with vtkErrorMacro (like in vtkMINCImageAttributes)
> really pass through this observer mechanism?
>

Looking at the code, it seems that it should. So something else is fishy.

Grateful for any ideas.

Elvis


>
> Thanks again for the help.
>
> Elvis
>
>
>>  - David
>>
>>
>> On Wed, Feb 24, 2016 at 5:41 AM, Elvis Stansvik <
>> elvis.stansvik at orexplore.com> wrote:
>>
>>> Hi all,
>>>
>>> In reading a MINC (1.0) image, I get errors printed:
>>>
>>> ERROR: In
>>> /build/vtk6-GxcjsY/vtk6-6.2.0+dfsg1/IO/MINC/vtkMINCImageAttributes.cxx,
>>> line 760
>>> vtkMINCImageAttributes (0x1e5c010): The attribute zspace:step was not
>>> found.
>>>
>>> ERROR: In
>>> /build/vtk6-GxcjsY/vtk6-6.2.0+dfsg1/IO/MINC/vtkMINCImageAttributes.cxx,
>>> line 760
>>> vtkMINCImageAttributes (0x1e5c010): The attribute zspace:start was not
>>> found.
>>>
>>> ERROR: In
>>> /build/vtk6-GxcjsY/vtk6-6.2.0+dfsg1/IO/MINC/vtkMINCImageAttributes.cxx,
>>> line 760
>>> vtkMINCImageAttributes (0x1e5c010): The attribute yspace:step was not
>>> found.
>>>
>>> ERROR: In
>>> /build/vtk6-GxcjsY/vtk6-6.2.0+dfsg1/IO/MINC/vtkMINCImageAttributes.cxx,
>>> line 760
>>> vtkMINCImageAttributes (0x1e5c010): The attribute yspace:start was not
>>> found.
>>>
>>> ERROR: In
>>> /build/vtk6-GxcjsY/vtk6-6.2.0+dfsg1/IO/MINC/vtkMINCImageAttributes.cxx,
>>> line 760
>>> vtkMINCImageAttributes (0x1e5c010): The attribute xspace:step was not
>>> found.
>>>
>>> ERROR: In
>>> /build/vtk6-GxcjsY/vtk6-6.2.0+dfsg1/IO/MINC/vtkMINCImageAttributes.cxx,
>>> line 760
>>> vtkMINCImageAttributes (0x1e5c010): The attribute xspace:start was not
>>> found.
>>>
>>> But these attributes are optional (and the reader correctly assumes 0
>>> for the start attributes, and 1.0 for the step attributes). But it seems
>>> the function
>>>
>>>     vtkMINCImageAttributes::GetAttributeValueAsDouble
>>>
>>> (which is used by the reader) unconditionally prints an error with
>>> vtkErrorMacro if the requested attribute does not exist :/
>>>
>>> Is there any way (from Python, VTK 6.2) that I can selectively suppress
>>> this somehow? I'd rather not have stuff printed on stderr for things that
>>> are harmless.
>>>
>>> Cheers,
>>> Elvis
>>>
>>
>>
>
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