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# ODQuerySetCallback(_:_:_:)

Sets the callback for an asynchronous query.

```
func ODQuerySetCallback(_ query: ODQueryRef!, _ callback: ODQueryCallback!, _ userInfo: UnsafeMutableRawPointer!)
```

## Parameters

`query`

The query.

`callback`

The callback function.

`userInfo`

A user-defined pointer to be passed back to the callback function.

## See Also

[`ODQueryCallback`](/documentation/OpenDirectory/ODQueryCallback)

A callback function called as results from a scheduled query are returned.


---

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