Phidget RFID & Unity IL2CPP Builds

[DiBi]

Hey,

We are trying to get the Phidget RFID device to work with IL2CPP Builds. Mono works fine, but IL2CPP throws the following exception when running the build, right after calling

Code: Select all

private static RFID _rfid;

private static void OpenDevice()
{
	_rfid = new();
	...
}

NotSupportedException: IL2CPP does not support marshaling delegates that point to instance methods to native code. The method we're attempting to marshal is: Phidget22.Phidget::nativeAttachEvent
at Phidget22.Phidget22Imports.Phidget_setOnAttachHandler (System.IntPtr phid, Phidget22.Phidget22Imports+AttachEvent fptr, System.IntPtr ctx) [0x00000] in <00000000000000000000000000000000>:0
at Phidget22.Phidget.initializeBaseEvents () [0x00000] in <00000000000000000000000000000000>:0
at Phidget22.RFID.initializeEvents () [0x00000] in <00000000000000000000000000000000>:0
at Next.Experimental.PhidgetRFID.PhidgetRFID.OpenThread () [0x00000] in <00000000000000000000000000000000>:0
at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00000] in <00000000000000000000000000000000>:0
at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) [0x00000] in <00000000000000000000000000000000>:0
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)

Seems we are not even getting to the point where other 3rd party developers recommend to use the following attribute on static callback methods:

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[MonoPInvokeCallback( typeof( Phidget22.Events.RFIDTagEventHandler ) )]
private static void OnTag( object sender, Phidget22.Events.RFIDTagEventArgs e )
{
	...
}

Any ideas how we can solve this?

Cheers,
Dirk

[Patrick]

If IL2CPP can't marshal instance delegates, then it can't be used with Phidget22. The library manages events internally. What platform are you targeting? Can you not use Mono?

-Patrick

[DiBi]

Hi Patrick,

Thanks for the prompt reply.

We are currently mostly targeting Windows platforms. The reason this issue came up is because our applications are technically demanding and thus quite performance-heavy. IL2CPP gives us a nice performance boost and we plan to use some of the Burst compiler features in the near future, which depends on IL2CPP.

I guess the best way to approach this and benefit from all the performance enhancement IL2CPP/Burst provides, is to use a standalone application that handles all Phidget Input and use a simple protocol like OSC to send the data over to Unity.

Cheers,
Dirk