---
title: "AudioUnitExtensionCopyComponentList(_:)"
framework: audiotoolbox
role: symbol
role_heading: Function
path: "audiotoolbox/audiounitextensioncopycomponentlist(_:)"
---

# AudioUnitExtensionCopyComponentList(_:)

Returns the component registrations for a given audio unit extension.

## Declaration

```swift
func AudioUnitExtensionCopyComponentList(_ extensionIdentifier: CFString) -> Unmanaged<CFArray>?
```

## Parameters

- `extensionIdentifier`: The bundle identifier of the audio unit extension.

## Return Value

Return Value An array of component registrations.

## Discussion

Discussion This function returns an array of dictionaries (one dictionary for each registration component) in the same format as described in Audio Components. Release this value when you’re done with it.

## See Also

### Audio Units

- [Creating an audio unit extension](avfaudio/creating-an-audio-unit-extension.md)
- [Creating custom audio effects](avfaudio/creating-custom-audio-effects.md)
- [Incorporating Audio Effects and Instruments](audiotoolbox/incorporating-audio-effects-and-instruments.md)
- [Debugging Out-of-Process Audio Units on Apple Silicon](audiotoolbox/debugging-out-of-process-audio-units-on-apple-silicon.md)
- [Rendering Spatial Audio from Bluetooth headphones](audiotoolbox/rendering-spatial-audio-from-bluetooth-headphones.md)
- [AUAudioUnit](audiotoolbox/auaudiounit.md)
- [AUAudioUnitBus](audiotoolbox/auaudiounitbus.md)
- [AUAudioUnitBusArray](audiotoolbox/auaudiounitbusarray.md)
- [AUAudioUnitPreset](audiotoolbox/auaudiounitpreset.md)
- [AUAudioUnitV2Bridge](audiotoolbox/auaudiounitv2bridge.md)
- [AUHeadTrackingBinauralRenderer](audiotoolbox/auheadtrackingbinauralrenderer.md)
- [AudioUnitExtensionSetComponentList(_:_:)](audiotoolbox/audiounitextensionsetcomponentlist(_:_:).md)
- [AUAudioUnitFactory](audiotoolbox/auaudiounitfactory.md)