Problem with UObject replicaiton

Development Programming & Scripting Multiplayer & Networking
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1

Hello everybody, I need to replicate my UObject from server to client, what I do wrong? On the server side data is UObject is valid on the client side - not.
Below my replication code: (UObject and AActor)

ItemObject.h

#pragma once

#include "CoreMinimal.h"
#include "Core.h"
#include "Object.h"
#include "ItemObject.generated.h"

UCLASS(Blueprintable)
class MYGAME_API UItemObject : public UObject
{
	GENERATED_BODY()
	UItemObject(const class FObjectInitializer& ObjectInitializer);
public:
	
	UPROPERTY(Replicated)
	uint32 bReplicatedFlag : 1;

	virtual bool IsSupportedForNetworking() const override
	{
		return true;
	}
	
};

ItemObject.cpp

#include "ItemObject.h"
#include "UnrealNetwork.h"
#include "Engine.h"

UItemObject::UItemObject(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer)
{
}

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

	DOREPLIFETIME(UItemObject, bReplicatedFlag);
}

MyPlayerController.h

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/PlayerController.h"
#include "Core.h"
#include "ItemObject.h"
#include "MyPlayerController.generated.h"

/**
 * 
 */
UCLASS()
class MYGAME_API AMyPlayerController : public APlayerController
{
	GENERATED_BODY()
		AMyPlayerController(const class FObjectInitializer& ObjectInitializer);
public:

	virtual void PostInitializeComponents() override;
	virtual bool ReplicateSubobjects(class UActorChannel *Channel, class FOutBunch *Bunch, FReplicationFlags *RepFlags) override;

	/** A Replicated Subobject */
	UPROPERTY(Replicated)
	UItemObject* Subobject;

private:
		
};

MyPlayerController.cpp

#include "MyPlayerController.h"
#include "UnrealNetwork.h"
#include "Engine/ActorChannel.h"
#include "ItemObject.h"


AMyPlayerController::AMyPlayerController(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer)
{
	bReplicates = true;
}

void AMyPlayerController::PostInitializeComponents()
{
	Super::PostInitializeComponents();

	if (HasAuthority())
	{
		Subobject = NewObject<UItemObject>(this);
	}
}

bool AMyPlayerController::ReplicateSubobjects(class UActorChannel *Channel, class FOutBunch *Bunch, FReplicationFlags *RepFlags)
{
	bool WroteSomething = Super::ReplicateSubobjects(Channel, Bunch, RepFlags);

	if (Subobject != nullptr)
	{
		WroteSomething |= Channel->ReplicateSubobject(Subobject, *Bunch, *RepFlags);
	}

	return WroteSomething;
}

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

	DOREPLIFETIME(AMyPlayerController, Subobject);
}
2

I can’t see anything wrong with this, what do you mean by the data on the client being being invalid? You don’t even get the object?

3

It looks fine in quick glance. It does take a few fractions of a second for Objects to replicate from the server. If you are not already; perform a Validation Check before using the sub object to ensure you do not crashing the game. It… should… replicate down.

4

Other than using GameState instead of player controller i have the same setup and it does not replicate the uobject. :frowning:

5

Ok so I found the missing part which would make the code work

You have to set this flag when creating the uobject that you want replicated RF_Public

I referenced this post here since it is a nearly perfect example for UObject Replication (Except the part that is replicating values on PlayerController which i think is not a good standard).

https://forums.unrealengine.com/t/uobject-eligible-for-replication-guide/671679/2