[vtkusers] Json object error caused by websocket.py

[Aron Helser]

Thanks for the feedback! I've updated the wiki.

On Tue, Mar 20, 2018 at 4:51 AM, 沈庄明 <zhuangming.shen at sphic.org.cn> wrote:

> ​​Hi Aron,
>
>
> In the RemoteRenderer example https://www.vtk.org/Wiki/VTK/
> Examples/Python/Web/RemoteRenderer. If this code runs under VTK 8.1.0, I
> think
>
>
> self.Application.GetObjectIdMap().SetActiveObject("VIEW", renderWindow)
>
>
> should be changed to
>
>
> self.initApplication().GetObjectIdMap().SetActiveObject("VIEW", renderWindow)
>
>
> otherwise, an error will occur
>
>
> AttributeError: '_WebCone' object has no attribute 'Application'​
>
>
>
> Regards,
>
>
> Zhuangming Shen
> ------------------------------
> *From:* Aron Helser <aron.helser at kitware.com>
> *Sent:* Sunday, March 18, 2018 5:03 AM
> *To:* 沈庄明; VTK Users
> *Subject:* Re: [vtkusers] Json object error caused by websocket.py
>
> Were you referring to this VTK web example? https://www.vtk.org/
> Wiki/VTK/Examples/Python/Web/RemoteRenderer
> This has been updated on the ParaViewWeb examples page for wslink:
> https://kitware.github.io/paraviewweb/examples/RemoteRenderer.html
> As you can see it is very similar.
>
> Hope that helps,
> Aron
>
> On Thu, Mar 15, 2018 at 9:30 PM, Aron Helser <aron.helser at kitware.com>
> wrote:
>
>> Hi  Zhuangming,
>> (adding back the list)
>>
>> We have tested wslink and vtk with python 3.5 and 3.6. They may use some
>> features that require 3.5, but I'm not sure if there would be any issues
>> with 3.4.
>>
>> Which vtkweb example are you following? It is likely to be very similar
>> with wslink - we designed it to require very few changes from the previous
>> implementation.
>>
>> Regards,
>> Aron
>>
>> On Thu, Mar 15, 2018 at 4:50 AM, 沈庄明 <zhuangming.shen at sphic.org.cn>
>> wrote:
>>
>>> ​Hi Aron,
>>>
>>>
>>> Sorry for interrupting you again. I'm learning how to use wslink in my
>>> project. My project is coded using previous vtkweb framework, and learn a
>>> lot from its simple example to display a cone on the browse. Now I would
>>> like to use wslink, which can support python 3.x, to replace the old
>>> framework. I am not sure if you could provide me a similar simple example.
>>> Then I could learn by myself how to do that. Thanks in advance.
>>>
>>>
>>>
>>> Regards,
>>>
>>>
>>> Zhuangming Shen
>>> ------------------------------
>>> *From:* Aron Helser <aron.helser at kitware.com>
>>> *Sent:* Wednesday, March 14, 2018 11:51 PM
>>> *To:* 沈庄明
>>> *Subject:* Re: [vtkusers] Json object error caused by websocket.py
>>>
>>> Thanks for the report - we've tested with Python 3.6, but I'm not sure
>>> there's automated testing for this code.
>>> If you'd like to report a bug, that'd be great.
>>>
>>> Thanks!
>>> Aron
>>>
>>> On Wed, Mar 14, 2018 at 4:11 AM, 沈庄明 <zhuangming.shen at sphic.org.cn>
>>> wrote:
>>>
>>>> Hi all,
>>>>
>>>>
>>>> I found there probably be a bug around Line 250
>>>> in <VTK_build>/Wrapping/Python/wslink/websocket.py. If this code is
>>>> run using python 3.x, this will cause an error "json object must be str not
>>>> 'bytes' " when use json.loads. To avoid this error, I think the code can be
>>>> modified by
>>>>
>>>> ​
>>>>
>>>>
>>>>
>>>>
>>>> Regards,
>>>>
>>>>
>>>> Zhuangming Shen
>>>>
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>>
>
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