---
title: kSpeechRefConProperty
framework: applicationservices
role: symbol
role_heading: Global Variable
path: applicationservices/kspeechrefconproperty
---

# kSpeechRefConProperty

Set a speech channel’s reference constant value.

## Declaration

```swift
let kSpeechRefConProperty: CFString
```

## Discussion

Discussion The reference constant value is passed to application-defined callback functions and might contain any value convenient for the application. The value associated with this property is a CFNumber object that contains an integer value. For example, an application might set the value of the CFNumber object to an address in memory that contains a reference to an object or a pointer to a function. This property works with the SetSpeechProperty(_:_:_:) function.