---
title: kMIDIInvalidUniqueID
framework: coremidi
role: symbol
role_heading: Global Variable
path: coremidi/kmidiinvaliduniqueid
---

# kMIDIInvalidUniqueID

An invalid identifier.

## Declaration

```swift
var kMIDIInvalidUniqueID: MIDIUniqueID { get }
```

## See Also

### Enumerations

- [MIDICICategoryOptions](coremidi/midicicategoryoptions.md)
- [MIDICIDeviceType](coremidi/midicidevicetype.md)
- [MIDICIManagementMessageType](coremidi/midicimanagementmessagetype.md)
- [MIDICIProcessInquiryMessageType](coremidi/midiciprocessinquirymessagetype.md)
- [MIDICIProfileMessageType](coremidi/midiciprofilemessagetype.md)
- [MIDICIProfileType](coremidi/midiciprofiletype.md)
- [MIDICIPropertyExchangeMessageType](coremidi/midicipropertyexchangemessagetype.md)
- [MIDINetworkConnectionPolicy](coremidi/midinetworkconnectionpolicy.md)
- [MIDINoteAttribute](coremidi/midinoteattribute.md)
- [MIDIPerNoteManagementOptions](coremidi/midipernotemanagementoptions.md)
- [MIDIProgramChangeOptions](coremidi/midiprogramchangeoptions.md)
- [MIDIUMPCIObjectBackingType](coremidi/midiumpciobjectbackingtype.md)
- [MIDIUMPFunctionBlockDirection](coremidi/midiumpfunctionblockdirection.md)
- [MIDIUMPFunctionBlockMIDI1Info](coremidi/midiumpfunctionblockmidi1info.md)
- [MIDIUMPFunctionBlockUIHint](coremidi/midiumpfunctionblockuihint.md)