Replication of an object's variables when stored as a PlayerState member

Development Programming & Scripting
,
1

I want to know how i can store my replicated variables in a separate UCLASS object stored as a member of my custom PlayerState.

I’m encountering difficulties initiating replication for variables stored in the UCLASS object. When I implement GetLifetimeReplicatedProps in the PlayerState class and call MetaData->GetLifetimeReplicatedProps , passing in the FLifetimeProperty array, I encounter a failed assert during packaging due to a mismatch of replicated indices in the child object.

Code example:

class AMyPlayerState : public APlayerState
{
   virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override
   {
      Super::GetLifetimeReplicatedProps(OutLifetimeProps);

      // ERROR HERE - REPINDEX out of order during packaging
      MetaData->GetLifetimeReplicatedProps(OutLifetimeProps);  
   }
   UPROPERTY(BlueprintReadWrite, EditAnywhere)
   FMetaData* MetaData;
}

UCLASS(BlueprintType)
class UMetaData
{
   // no virtual method to override - implement directly
   void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const 
   {
      DOREPLIFETIME_CONDITION(UMetaData, Field, COND_None);
   }
   UPROPERTY(BlueprintReadWrite, Editanywhere, ReplicatedUsing=OnRep_Field)
   FString Field;

   UFUNCTION()
   void OnRep_Field();
}

Thank you for your consideration.

2

It doesn’t work like that. You can only replicate properties within the current object.

Implementing replication on custom UObjects seems to be rather complicated and ever-changing, I’ve never done it myself so I can’t really recommend it.

I’d recommend using an ActorComponent instead, which has builtin replication just like actors.

class UMetaData : public UActorComponent
{
    GENERATED_BODY()

    UMetaData()
    {
        SetIsReplicatedByDefault(true);
    }

    virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override
    {
        Super::GetLifetimeReplicatedProps(OutLifetimeProps);
        DOREPLIFETIME_CONDITION(ThisClass, Field, COND_None);
    }
}