# NextAudioFileRegion(_:) Finds the next audio file region in a region list. ``` func NextAudioFileRegion(_ inAFRegionPtr: UnsafePointer) -> UnsafeMutablePointer ``` ## Parameters `inAFRegionPtr` A pointer to an audio file region in the region list. ## Return Value A pointer to the next region after the region pointed to by the `inAFRegionPtr` parameter. This value can be beyond the end of the list, so pay attention to the total number of regions in the list. ## Discussion Because audio file regions are of variable length, you cannot easily walk the list. Use this convenience function when you call the [`AudioFileGetProperty(_:_:_:_:)`](/documentation/AudioToolbox/AudioFileGetProperty(_:_:_:_:)) function with the [`kAudioFilePropertyRegionList`](/documentation/AudioToolbox/kAudioFilePropertyRegionList) property to walk through the list of regions returned. ## See Also [`AudioFileSetProperty`](/documentation/AudioToolbox/AudioFileSetProperty(_:_:_:_:)) Sets the value of an audio file property --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)