# \#callback

**URL:** https://forum.commonvisionblox.com/tag/callback/75.md

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## [Catching the Std::AcquisitionEnd event for the camera : Automation Technology C5 / CVB 13.02.04](https://forum.commonvisionblox.com/t/catching-the-std-acquisitionend-event-for-the-camera-automation-technology-c5-cvb-13-02-04/2510)

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**Author:** [@Aytoo](https://forum.commonvisionblox.com/u/Aytoo)\
**Replies:** 2\
**Last updated:** [November 4, 2026, 12:09am UTC](https://forum.commonvisionblox.com/t/catching-the-std-acquisitionend-event-for-the-camera-automation-technology-c5-cvb-13-02-04/2510 "2026-11-04T00:09:26Z")

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Hello, I am using the C-Style API to handle the C5 (and C6) camera from Automation Technology. I wanted to add a mechanism to catch the AcquisitionEnd event, which occurs when the camera is triggered to deliver the ima…

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## [Event registration: NullReferenceException](https://forum.commonvisionblox.com/t/event-registration-nullreferenceexception/265)

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**Author:** [@Tomes](https://forum.commonvisionblox.com/u/Tomes)\
**Replies:** 4\
**Last updated:** [November 14, 2017, 10:40am UTC](https://forum.commonvisionblox.com/t/event-registration-nullreferenceexception/265 "2017-11-14T10:40:36Z")

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Hi, I was testing out the connection events (disconnect/reconnect) and got a NullReferenceException with no further information. The registration of the events works fine. The exception occurs when I unplug a camera, s…