Server Replication Question (Spawn a Class)

Development Programming & Scripting Multiplayer & Networking
, , , , , ,
6

You can replicate entire structs if their properties are marked as UPROPERTY().

Simplified example from ShooterGame:

/** replicated information on a hit we've taken */
USTRUCT()
struct FTakeHitInfo
{
	GENERATED_USTRUCT_BODY()

	UPROPERTY()
	float ActualDamage;

	/** The damage type we were hit with. */
	UPROPERTY()
	UClass* DamageTypeClass;

	UPROPERTY()
	TWeakObjectPtr<class AShipPawn> PawnInstigator;

	/** Specifies which DamageEvent below describes the damage received. */
	UPROPERTY()
	int32 DamageEventClassID;

	UPROPERTY()
	uint32 bKilled : 1;

private:

	/** A rolling counter used to ensure the struct is dirty and will replicate. */
	UPROPERTY()
	uint8 EnsureReplicationByte;

	/** Describes general damage. */
	UPROPERTY()
	FDamageEvent GeneralDamageEvent;
public:
	FTakeHitInfo()
		: ActualDamage(0)
		, DamageTypeClass(NULL)
		, PawnInstigator(NULL)
		, DamageEventClassID(0)
		, bKilled(false)
		, EnsureReplicationByte(0)
	{}

	FDamageEvent& GetDamageEvent()
	{
		if (GeneralDamageEvent.DamageTypeClass == NULL)
		{
			GeneralDamageEvent.DamageTypeClass = DamageTypeClass ? DamageTypeClass : UDamageType::StaticClass();
		}
		return GeneralDamageEvent;
	}

	void EnsureReplication()
	{
		EnsureReplicationByte++;
	}
};

class AMyPawn : public APawn
{
    ...
    UPROPERTY(Transient, ReplicatedUsing = OnRep_LastTakeHitInfo)
    struct FTakeHitInfo LastTakeHitInfo;
    ...
}


void AMyPawn::GetLifetimeReplicatedProps(TArray< FLifetimeProperty > & OutLifetimeProps) const
{
	Super::GetLifetimeReplicatedProps(OutLifetimeProps);

	DOREPLIFETIME_CONDITION(AMyPawn, LastTakeHitInfo, COND_OwnerOnly);
}