---
title: QueryInterface
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.14+]
path: iokit/iousbinterfaceinterface942/2977232-queryinterface
---

# QueryInterface

## Declaration

```occ
HRESULT (*QueryInterface)(void *thisPointer, REFIID iid, LPVOID *ppv);
```