IL2CPP does not support marshaling delegates that point to instance methods to native code

Hi folks,

I'm using a plugin to get a secure Game Center login, when I attempt to run through the process I get the error in the title.

My call to start the process looks like this:

Code (CSharp):

1. GenerateSignature( ( signature, key, salt, timestamp ) =>
2. {
3.     if( !string.IsNullOrEmpty( signature ) )
4.     {
5.         PlayFabClientAPI.LinkGameCenterAccount( new LinkGameCenterAccountRequest()
6.         {
7.             GameCenterId = Social.localUser.id,
8.             Signature = signature,
9.             PublicKeyUrl = key,
10.             Salt = salt,
11.             Timestamp = timestamp.ToString(),
12.             ForceLink = false
13.         },
14.         ( result ) =>
15.         {
16.             m_AccountsLinked[ ( int )AccountType.Platform ] = true;
17.             callback?.Invoke();
18.         },
19.         ( error ) => { ProcessLinkError( AccountType.Platform, error.Error, callback ); } );
20.     }
21.     else callback?.Invoke();
22. } );

I then make the call to the plugin and catch the results with the following code:

Code (CSharp):

1. #if UNITY_IOS
2. void GenerateSignature( SignatureDelegate callback )
3. {
4.     if( callback != null )
5.         m_SignatureCallbacks += callback;
6.  
7.     GameCenterSignature.Generate( SignatureSucceeded, SignatureFailed );
8. }
9.  
10. [MonoPInvokeCallback( typeof( GameCenterSignature.OnSucceeded ) )]
11. void SignatureSucceeded( string publicKeyUrl, ulong timeStamp, string signature, string salt, string playerId, string alias, string bundleId )
12. {
13.     if( m_SignatureCallbacks != null )
14.     {
15.         m_SignatureCallbacks?.Invoke( signature, publicKeyUrl, salt, timeStamp );
16.         m_SignatureCallbacks = null;
17.     }
18. }
19.  
20. [MonoPInvokeCallback( typeof( GameCenterSignature.OnFailed ) )]
21. void SignatureFailed( string error )
22. {
23.     if( m_SignatureCallbacks != null )
24.     {
25.         m_SignatureCallbacks?.Invoke( string.Empty, string.Empty, string.Empty, 0 );
26.         m_SignatureCallbacks = null;
27.     }
28. }
29. #endif

Can anyone explain to me which function/delegate is the problem and how I should go about fixing it?

I really appreciate the help! Thanks!
-Matt

 

I'm using Unity 2018.4, and I do see what you mean. The full error looks like:

Code (CSharp):

1. NotSupportedException: IL2CPP does not support marshaling delegates that point to instance methods to native code.
2.  
3.   at Online.GameCenterSignature.Generate (Online.GameCenterSignature+OnSucceeded OnSucceeded, Online.GameCenterSignature+OnFailed OnFailed) [0x00000] in <00000000000000000000000000000000>:0
4.  
5.   at SocialManager+<>c.<LogIntoAccount>b__16_0 (System.Boolean success) [0x00000] in <00000000000000000000000000000000>:0
6.  
7.   at UnityEngine.SocialPlatforms.GameCenter.GameCenterPlatform.AuthenticateCallbackWrapper (System.Int32 result, System.String error) [0x00000] in <00000000000000000000000000000000>:0

So does that mean I can simply make those two functions static and it'll work?

EDIT: That fixed it...just setting those functions to static worked!

Thanks for the help!
-Matt