---
title: messageSize
framework: coremidi
role: symbol
role_heading: Instance Property
path: coremidi/midiioerrornotification/messagesize
---

# messageSize

The size of the message.

## Declaration

```swift
var messageSize: UInt32
```

## See Also

### Inspecting an error notification

- [messageID](coremidi/midiioerrornotification/messageid.md)
- [driverDevice](coremidi/midiioerrornotification/driverdevice.md)
- [errorCode](coremidi/midiioerrornotification/errorcode.md)