---
title: USBGetSerialNumberStringIndex
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.14+]
path: iokit/iousbdeviceinterface942/2977182-usbgetserialnumberstringindex
---

# USBGetSerialNumberStringIndex

## Declaration

```occ
IOReturn (*USBGetSerialNumberStringIndex)(void *self, UInt8 *snsi);
```