# MIDIInputPortCreateWithBlock(_:_:_:_:) Creates an input port through which the client may receive incoming MIDI messages from any MIDI source. ``` func MIDIInputPortCreateWithBlock(_ client: MIDIClientRef, _ portName: CFString, _ outPort: UnsafeMutablePointer, _ readBlock: @escaping MIDIReadBlock) -> OSStatus ``` ## Parameters `client` The client to own the newly-created port. `portName` The name of the port. `outPort` On successful return, points to the newly-created MIDIPort. `readBlock` The MIDIReadBlock which will be called with incoming MIDI, from sources connected to this port. ## Return Value An OSStatus result code. ## Discussion After creating a port, use MIDIPortConnectSource to establish an input connection from any number of sources to your port. readBlock will be called on a separate high-priority thread owned by CoreMIDI. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)