# \[FIXED, C# WRAPPER\] System audio device changes do not fire events

**URL:** <https://devforum.zoom.us/t/fixed-c-wrapper-system-audio-device-changes-do-not-fire-events/21501>\
**Category:** Meeting SDK\
**Created:** [June 16, 2020, 3:05pm UTC](https://devforum.zoom.us/t/fixed-c-wrapper-system-audio-device-changes-do-not-fire-events/21501 "2020-06-16T15:05:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bragma](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/bragma/32/4213_2.png) [@bragma](https://devforum.zoom.us/u/bragma)\
**Post date:** [June 16, 2020, 3:05pm UTC](https://devforum.zoom.us/t/fixed-c-wrapper-system-audio-device-changes-do-not-fire-events/21501/1 "2020-06-16T15:05:49Z")

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**Description**  
Calls to Add\_CB\_onComputerMicDeviceChanged and Add\_CB\_onComputerSpeakerDeviceChanged do not work. Specified callbacks are registered but never fired.

I created [pull request #27](https://github.com/zoom/zoom-c-sharp-wrapper/pull/27) to fix the problem.

**Which version?**  
C# Wrapper v4.6.21666.0428

**To Reproduce(If applicable)**  
Use Add\_CB\_onComputerMicDeviceChanged(cb) and Add\_CB\_onComputerSpeakerDeviceChanged(cb) in your code, then connect/disconnect USB headphones.

**Device (please complete the following information):**

- Device Spec: PC
- OS: Windows
- Version 10

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**Author:** ![carson.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/carson.zoom/32/785_2.png) [@carson.zoom](https://devforum.zoom.us/u/carson.zoom)\
**Post date:** [June 17, 2020, 5:58am UTC](https://devforum.zoom.us/t/fixed-c-wrapper-system-audio-device-changes-do-not-fire-events/21501/2 "2020-06-17T05:58:01Z")

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Hi @bragma，

Thanks for the post and the pull request. Let me forward your pull request to the engineering team. Will provide update in the pull request.

Thanks!

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**Author:** ![DeveloperBot](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/developerbot/32/12632_2.png) [@DeveloperBot](https://devforum.zoom.us/u/DeveloperBot)\
**Post date:** [August 21, 2020, 10:05pm UTC](https://devforum.zoom.us/t/fixed-c-wrapper-system-audio-device-changes-do-not-fire-events/21501/3 "2020-08-21T22:05:34Z")

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Closed on August 21, 2020, 10:05pm UTC