---
title: kUSBInterfaceStringIndex
framework: IOKit
role: symbol
role_heading: Macro
platforms: [Mac Catalyst 13.0+, macOS 10.1+]
path: iokit/kusbinterfacestringindex
---

# kUSBInterfaceStringIndex

## Declaration

```occ
#define kUSBInterfaceStringIndex
```

## Discussion

The field in the USB Interface Descriptor corresponding to the index for the interface name's string