---
title: WritePipe
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.14+]
path: iokit/iousbinterfaceinterface942/2977255-writepipe
---

# WritePipe

## Declaration

```occ
IOReturn (*WritePipe)(void *self, UInt8 pipeRef, void *buf, UInt32 size);
```