---
title: refCon
framework: corevideo
role: symbol
role_heading: Instance Property
path: corevideo/cvfillextendedpixelscallbackdata/refcon
---

# refCon

A pointer to application-defined data that is passed to your custom pixel fill function.

## Declaration

```swift
var refCon: UnsafeMutableRawPointer?
```

## See Also

### Properties

- [fillCallBack](corevideo/cvfillextendedpixelscallbackdata/fillcallback.md)
- [version](corevideo/cvfillextendedpixelscallbackdata/version.md)