---
title: numMaps
framework: coremidi
role: symbol
role_heading: Instance Property
path: coremidi/midithruconnectionparams/nummaps
---

# numMaps

The number of MIDI value maps in the variable-length portion of the struct.

## Declaration

```swift
var numMaps: UInt16
```

## See Also

### Connection Parameters

- [noteNumber](coremidi/midithruconnectionparams/notenumber.md)
- [lowNote](coremidi/midithruconnectionparams/lownote.md)
- [highNote](coremidi/midithruconnectionparams/highnote.md)
- [velocity](coremidi/midithruconnectionparams/velocity.md)
- [lowVelocity](coremidi/midithruconnectionparams/lowvelocity.md)
- [highVelocity](coremidi/midithruconnectionparams/highvelocity.md)
- [keyPressure](coremidi/midithruconnectionparams/keypressure.md)
- [channelPressure](coremidi/midithruconnectionparams/channelpressure.md)
- [version](coremidi/midithruconnectionparams/version.md)
- [numSources](coremidi/midithruconnectionparams/numsources.md)
- [sources](coremidi/midithruconnectionparams/sources.md)
- [numDestinations](coremidi/midithruconnectionparams/numdestinations.md)
- [destinations](coremidi/midithruconnectionparams/destinations.md)
- [channelMap](coremidi/midithruconnectionparams/channelmap.md)
- [filterOutAllControls](coremidi/midithruconnectionparams/filteroutallcontrols.md)