# How to register setpreviewcallback method using wzcameraview.

**URL:** <https://community.wowza.com/t/how-to-register-setpreviewcallback-method-using-wzcameraview/48835>\
**Category:** Wowza GoCoder SDK\
**Created:** [May 25, 2017, 6:45pm UTC](https://community.wowza.com/t/how-to-register-setpreviewcallback-method-using-wzcameraview/48835 "2017-05-25T18:45:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![venkey\_maruthai](https://avatars.discourse-cdn.com/v4/letter/v/aca169/32.png) [@venkey\_maruthai](https://community.wowza.com/u/venkey_maruthai)\
**Post date:** [May 25, 2017, 6:45pm UTC](https://community.wowza.com/t/how-to-register-setpreviewcallback-method-using-wzcameraview/48835/1 "2017-05-25T18:45:22Z")

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When we try to register the setpreviewcallback method or setOneShotPreviewCallback events, it is not invoking the onpreviewframe method. could you please share some sample code on how to register this event or how to grab the byte array data.