---
title: IOCompletionProcPtr
framework: Core Services
role: symbol
role_heading: Type Alias
platforms: [Mac Catalyst 17.0+, macOS 10.0+]
path: coreservices/iocompletionprocptr
---

# IOCompletionProcPtr

## Declaration

```occ
typedef void (*IOCompletionProcPtr)(ParmBlkPtr paramBlock);
```