---
title: GetInterfaceNumber
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.14+]
path: iokit/iousbinterfaceinterface942/2977219-getinterfacenumber
---

# GetInterfaceNumber

## Declaration

```occ
IOReturn (*GetInterfaceNumber)(void *self, UInt8 *intfNumber);
```