---
title: WritePipeAsync
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.14+]
path: iokit/iousbinterfaceinterface942/2977256-writepipeasync
---

# WritePipeAsync

## Declaration

```occ
IOReturn (*WritePipeAsync)(void *self, UInt8 pipeRef, void *buf, UInt32 size, IOAsyncCallback1 callback, void *refcon);
```