# Get the observer

**URL:** https://discourse.slicer.org/t/get-the-observer/17167
**Category:** Support
**Created:** [April 19, 2021, 12:07pm UTC](https://discourse.slicer.org/t/get-the-observer/17167 "2021-04-19T12:07:21Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![timeanddoctor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/timeanddoctor/32/5839_2.png) [@timeanddoctor](https://discourse.slicer.org/u/timeanddoctor)
#### Post date: [April 19, 2021, 12:07pm UTC](https://discourse.slicer.org/t/get-the-observer/17167/1 "2021-04-19T12:07:21Z")

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How can I get the observer(vtkObserver ) from a interactor.  
such as the print(interactor):  
vtkWin32RenderWindowInteractor (0000021811DBF070)  
Debug: Off  
Modified Time: 376531  
Reference Count: 2  
Registered Events:  
Registered Observers:  
vtkObserver (0000021811E26D80)  
Event: 12  
EventName: LeftButtonPressEvent  
Command: 0000021812223760  
Priority: 0  
Tag: 90

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### Author: ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [September 5, 2021, 2:10am UTC](https://discourse.slicer.org/t/get-the-observer/17167/2 "2021-09-05T02:10:32Z")

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I don’t think there is an API to get observers to an object, because only that software component should remove the observation that added it. That component stores the observation tag when it creates the observation.

Why do you need the observer?