1. Bolt
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+1
Fixed (Unreleased)

MarshalDirectiveException when trying to create struct that contains a UnityEngine.Component field

jerome latteux 1 year ago • updated by Lazlo Bonin (Lead Developer) 10 months ago • 4

I was trying to do the same thing as in this post, creating a new constraint source:
https://support.ludiq.io/communities/5/topics/2132-parameterless-struct-constructors-not-available

But in Bolt2 I get the following error message:

MarshalDirectiveException: Type UnityEngine.Component which is passed to unmanaged code must have StructLayout attribute.
(wrapper unknown) UnityEngine.Animations.ConstraintSource.StructureToPtr(object,intptr,bool)

Bolt Version:
2.0.0a5
Unity Version:
2019.3
Platform(s):
Scripting Backend:
.NET Version (API Compatibility Level):
.NET 4.x
Bolt 2 GFI
Need More Information
Lazlo Bonin (Lead Developer) 1 year ago

Hi Jerome,

Thanks for the report and sorry for the very late reply on this.

Could you please show me your graph or give me step-by-step reproduction steps?

bittsu 11 months ago

This happens to me when I try to work with structs that hold a MonoBehaviour field. (I guess this is the "Type UnityEngine.Component", which is referred to in the error.)

Try to create such struct in the graph, or use a method that uses that struct and the error will appear on play.

MarshalDirectiveException: Type UnityEngine.Component which is passed to unmanaged code must have a StructLayout attribute.
(wrapper unknown) structtest.PtrToStructure(intptr,object)
Ludiq.Cloning.CloneViaMarshalling (System.Object value) (at Assets/Ludiq/Ludiq.Core/Runtime/Cloning/Cloning.cs:245)
Ludiq.Bolt.Flow.AssignLocal (System.Object identifier, Ludiq.Bolt.HybridType type, System.Object value) (at Assets/Ludiq/Bolt.Flow/Runtime/Flow.cs:259)
Ludiq.Bolt.Flow.SetValue (Ludiq.Bolt.ValueOutput output, System.Object value) (at Assets/Ludiq/Bolt.Flow/Runtime/Flow.cs:560)
Ludiq.Bolt.CreateStruct.Enter (Ludiq.Bolt.Flow flow) (at Assets/Ludiq/Bolt.Flow/Runtime/Units/Codebase/CreateStruct.cs:85)
Ludiq.Bolt.Flow.InvokeDelegate (Ludiq.Bolt.ControlInput input) (at Assets/Ludiq/Bolt.Flow/Runtime/Flow.cs:513)
Rethrow as GraphPingException:
Ludiq.Bolt.Flow.InvokeDelegate (Ludiq.Bolt.ControlInput input) (at Assets/Ludiq/Bolt.Flow/Runtime/Flow.cs:517)
Ludiq.Bolt.Flow.Invoke (Ludiq.Bolt.ControlOutput output) (at Assets/Ludiq/Bolt.Flow/Runtime/Flow.cs:408)
Ludiq.Bolt.EventHandlerUnit`1[TArgs].Invoke (Ludiq.Bolt.GraphReference reference, TArgs args) (at Assets/Ludiq/Bolt.Flow/Runtime/Units/Events/EventHandlerUnit.cs:114)
Ludiq.Bolt.EventHandlerUnit`1+<>c__DisplayClass17_0[TArgs].b__0 (TArgs args) (at Assets/Ludiq/Bolt.Flow/Runtime/Units/Events/EventHandlerUnit.cs:73)
Ludiq.Bolt.EventBus.Invoke[TArgs] (Ludiq.Bolt.EventHook hook, TArgs args) (at Assets/Ludiq/Bolt.Core/Runtime/Events/EventBus.cs:153)
UnityEngine.Debug:LogException(Exception, Object)
Ludiq.Bolt.EventBus:Invoke(EventHook, EmptyEventArgs) (at Assets/Ludiq/Bolt.Core/Runtime/Events/EventBus.cs:157)
Ludiq.Bolt.BoltClassShellTrait:InvokeEvent(EventHookID) (at Assets/Ludiq/Bolt.Core/Runtime/Architecture/BoltClassShellTrait.cs:870)
Ludiq.Bolt.BoltUnityClassShellTrait:Start() (at Assets/Ludiq/Bolt.Core/Runtime/Architecture/BoltUnityClassShellTrait.cs:30)
Ludiq.Bolt.BoltComponent:Start() (at Assets/Ludiq/Bolt.Core/Runtime/Architecture/BoltComponent.cs:121)

Lazlo Bonin (Lead Developer) 10 months ago

Hi Bittsu,

Thanks for the additional information.

Can you please show me:

1. The C# code for the struct

2. The graph used to create the struct

Thanks!

Fixed (Unreleased)
Lazlo Bonin (Lead Developer) 10 months ago

Thanks everyone, this issue was reproduced and will be fixed in the next version.

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