---
title: USBInterfaceGetStringIndex
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.14+]
path: iokit/iousbinterfaceinterface942/2977250-usbinterfacegetstringindex
---

# USBInterfaceGetStringIndex

## Declaration

```occ
IOReturn (*USBInterfaceGetStringIndex)(void *self, UInt8 *si);
```