Hi all,
I’m working on an app in OS X using Swift and having trouble with the MusicPlayer API.
The MusicTrackNewUserEvent is defined as:
A MusicEventUserData is defined as:
struct MusicEventUserData { var length: UInt32 var data: (UInt8) init() init(length length: UInt32, data data: (UInt8)) }
It’s my understanding that this is a C style trick where I can define my own structure and pass it into the MusicTrackNewUserEvent function. So I defined a structure:
struct EventPlayer {
var length = UInt32(sizeof(EventPlayer))
let stack: Something
init (x: Something) {self.stack = x}
}
I can, at least I believe because there are no errors, create a new event like so:
var a = Something()
var data = "">EventPlayer(x: a)
withUnsafePointer(&data) {pointer in
let dataPtr = UnsafePointer<MusicEventUserData>(pointer)
MusicTrackNewUserEvent(track, 1.0, dataPtr)
}
Here’s the problem I have though: the MusicSequenceUserCallback (which I created and passed into the sequencer just fine) has an argument data: UnsafePointer<MusicEventUserData> I am not sure how to convert that into my custom structure EventPlayer. Any help would be really appreciated, a google search on most CoreAudio questions for Swift result in only 5 hits.
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