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# AudioServicesAddSystemSoundCompletion(_:_:_:_:_:)

Registers a callback function that is invoked when a specified system sound finishes playing.

```
func AudioServicesAddSystemSoundCompletion(_ inSystemSoundID: SystemSoundID, _ inRunLoop: CFRunLoop?, _ inRunLoopMode: CFString?, _ inCompletionRoutine: AudioServicesSystemSoundCompletionProc, _ inClientData: UnsafeMutableRawPointer?) -> OSStatus
```

## Parameters

`inSystemSoundID`

The system sound that your callback function is to respond to.

`inRunLoop`

The run loop in which the callback function should run. Pass `NULL` to use the main run loop.

`inRunLoopMode`

The mode for the run loop in which the callback functions should run. Pass `NULL` to use the default run loop mode.

`inCompletionRoutine`

The callback function to be invoked when the specified system sound has finished playing.

`inClientData`

Application data to be passed to your callback function when it is invoked. Can be `NULL`.

## Return Value

A result code.

## Discussion

Because a system sound may play for several seconds, you might want to know when it has finished playing. For example, you may want to wait until a system sound has finished playing before you play another sound.

## See Also

[`AudioServicesCreateSystemSoundID`](/documentation/AudioToolbox/AudioServicesCreateSystemSoundID(_:_:))

Creates a system sound object.


---

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