# MIDIInputPortCreateWithProtocol(_:_:_:_:_:) Creates an input port through which the client may receive incoming MIDI messages from any MIDI source. ``` func MIDIInputPortCreateWithProtocol(_ client: MIDIClientRef, _ portName: CFString, _ protocol: MIDIProtocolID, _ outPort: UnsafeMutablePointer, _ receiveBlock: @escaping MIDIReceiveBlock) -> OSStatus ``` ## Parameters `client` The client to own the newly created port. `portName` The name of the port. `protocol` The MIDI protocol variant to deliver to this port. The system automatically converts messages from one protocol to another as needed. `outPort` On successful return, points to the newly created MIDI port. `receiveBlock` A callback block the system invokes with incoming MIDI from sources connected to this port. ## Return Value An `OSStatus` result code. ## Discussion After creating a port, use [`MIDIPortConnectSource(_:_:_:)`](/documentation/CoreMIDI/MIDIPortConnectSource(_:_:_:)) to establish an input connection from any number of sources to your port. The system calls the receive block on a separate high-priority thread owned by Core MIDI. --- 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)