# Manage INVALID HANDLE channel correctly

**URL:** https://qa.fmod.com/t/manage-invalid-handle-channel-correctly/20277
**Category:** FMOD Engine
**Tags:** cpp
**Created:** [June 2, 2023, 1:15pm UTC](https://qa.fmod.com/t/manage-invalid-handle-channel-correctly/20277 "2023-06-02T13:15:46Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![andy55](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/andy55/32/5016_2.png) [@andy55](https://qa.fmod.com/u/andy55)
#### Post date: [June 5, 2023, 2:48pm UTC](https://qa.fmod.com/t/manage-invalid-handle-channel-correctly/20277/2 "2023-06-05T14:48:06Z")

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Hi,

I’m relatively new to FMOD too and found this confusing as well.

I mention [here](https://qa.fmod.com/t/sound-callbacks-in-ios-background-mode/20256) about using [ChannelControl::setCallBack()](https://www.fmod.com/docs/2.02/api/core-api-channelcontrol.html#channelcontrol_setcallback) to get a callback when the sound ends so maybe that works for you. As I mentioned, I am still trying to figure out why it is not firing when iOS is in background mode.

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_[View the full topic](https://qa.fmod.com/t/manage-invalid-handle-channel-correctly/20277)._