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

[Elvis Stansvik]

2016-02-24 15:40 GMT+01:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:

> 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.
>

It's quite strange, because if I do:

def _handleMINCError(obj, event):
    print('Test')

and then

        self.reader = vtkMINCImageReader()
        self.reader.AddObserver(vtkCommand.ErrorEvent, _handleMINCError)
        self.reader.InvokeEvent('ErrorEvent', 'test')

to manually invoke the event, as a test, it works fine and "Test" is
printed. But the errors coming from the reader are still printed to stderr.

Elvis


>
> 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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