# init(destination:data:bytesToSend:complete:reserved:completionProc:completionRefCon:) Creates a new single system-exclusive (SysEx) event request. ``` init(destination: MIDIEndpointRef, data: UnsafePointer, bytesToSend: UInt32, complete: DarwinBoolean, reserved: (UInt8, UInt8, UInt8), completionProc: MIDICompletionProc, completionRefCon: UnsafeMutableRawPointer?) ``` ## Parameters `destination` The endpoint to send the event to. `data` Initially, a pointer to the SysEx event to send. The system advances this pointer as it sends the bytes. `bytesToSend` Initially, a counter of the number of bytes to send. The system decrements this counter as it sends the bytes. `complete` A Boolean value that indicates whether the transmission is complete. You can set this value to `true` to abort transmission and the system sets it to `true` after it transmits all the bytes. `reserved` `completionProc` A function that the system calls after it sends all bytes for the request, or after the client marks the request as complete. `completionRefCon` Data to pass to the `completionProc`. ## Discussion --- 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)