To use Audio Toolbox on iOS via Kotlin Native, I h...

# kotlin-native

[AnaR]

To use Audio Toolbox on iOS via Kotlin Native, I have the following code:

var url = NSBundle.mainBundle.URLForResource(file, "mp3")
var id:Int = 0
val status = AudioServicesCreateSystemSoundID(url, cValuesOf(id))
AudioServicesPlaySystemSound(id)

However, the url should be CFURLRef for AudioServices instead of NSURL returned by the URLForResource method. I tried bridging using:

var cfurl = CFBridgingRetain(url) as CFURLRef
val status = AudioServicesCreateSystemSoundID(cfurl, cValuesOf(id))

But, that throws a class cast. Not casting as CFURLRef results in a compiler error. Appreciate any pointers on what to try.

[AnaR]

Looks like toll-free bridging on iOS is not supported in Kotlin Native?

[svyatoslav.scherbina]

var cfurl = CFBridgingRetain(url) as CFURLRef

This should work. Maybe your url is null?

[svyatoslav.scherbina]

You also have another bug in this code, which isn’t related to the exception.

var id:Int = 0
val status = AudioServicesCreateSystemSoundID(url, cValuesOf(id))

This wouldn’t work as expected, because you pass the value of id variable instead of the pointer. So this call wouldn’t update your variable.
To get the id from AudioServicesCreateSystemSoundID, you can use something like

val id = memScoped {
    val idVar = alloc<SystemSoundIDVar>()
    AudioServicesCreateSystemSoundID(cfurl, idVar.ptr)
    idVar.value
}