---
title: mNotificationArgument1
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.7+]
path: iokit/iovideodevicenotification/1503991-mnotificationargument1
---

# mNotificationArgument1

A UInt32 whose usage depends on the the specific kind of notification.

## Declaration

```occ
UInt32 mNotificationArgument1;
```