CoreAudioMBS returns code -1

Targets iOS
1

Hi,

I need to get the volume of the default sound output on iOS. GetSoundVolumeMBS raises an exception (not supported on iOS), although the documentation says iOS is supported (:heavy_check_mark:).

So I’m trying another approach, with CoreAudioMBS:

Var CoreAudio As new CoreAudioMBS

Var m As MemoryBlock=CoreAudio.AudioHardwareGetPropertyMemory(CoreAudio.kAudioHardwarePropertyDefaultOutputDevice)
if CoreAudio.Lasterror<>0 then Break
Var DfltOut As Integer
if m<>nil then DfltOut=m.Int32Value(0)

With this code, m is nil and LastErrorCode=-1. The same code works on Mac OS (I tested on the emulator). Is it an entitlement issue? Or something else?

2

Sorry for the documentation error.
I’ll fix the checkmark. The function doesn’t work on iOS as the API we use isn’t available as far as I see.

1 Like
3

Thanks. Do you happen to know another way (or API)?

4

Let me check if I can improve the function.

Seems like I could return AVAudioSession.sharedInstance.outputVolume, but that seems to only be valid while you have an active audio session.