Matching GCController and IOHIDDeviceRef

Hello!

I encountered a problem in my OS X app. I'm using both IOKit HID devices and GameController.framework devices.

Problem is, all GCController devices have HID devices, and I didn't find any way of matching them.


So, here are questions:


1. Is there a way to say "this 

IOHIDDeviceRef
device is MFi controller which would be handled by GameController.framework"?

2. This 

GCController
and 
IOHIDDeviceRef
object refer to same physical controller and I can ignore/blacklist one of them in my code to avoid duplications


N.B.

There is 

[GCController deviceRef]
field. In fact it is 
IOHIDDeviceRef
, so I can get their 
IOHIDDeviceGetService
and then 
IORegistryEntryGetRegistryEntryID
to see if they're same connected device.

Problem is - 

deviceRef
is a private field. I'm not sure if I can use it when submitting app to App Store
Up vote post of shchvova Down vote post of shchvova
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Posted by
shchvova
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Wow, 6 years ago and find a post about a current issue.

We are hitting the same issue with an SDL2 based app whereby MFi / IOKit compatible controllers (PS/XB/Switch Pro) get detected twice resulting in the appearance that 2 gamepads are connected when there is only 1 in actuality. Is there a method for filtering this out to avoid duplicates?

Posted by
step_jac
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Looks like as of OSX 11, GCController implements supportsHIDDevice: which should allow for filtering duplicates. This is used within SDL2 but likely a bug or order of operations issue depending on whether GC or IOKit detects first.

Posted by
step_jac
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  • Could you elaborate? Under what use case is +supportsHIDDevice: not returning the correct result for you?

    —
    Justin
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