온라인 서브시스템과 세션 생성, 찾기

 

https://dev.epicgames.com/documentation/ko-kr/unreal-engine/online-subsystem-in-unreal-engine?application_version=5.1

온라인 서브시스템

 

Online Subsystem (온라인 서브시스템) 및 그 인터페이스는 Steam, Xbox Live, Facebook 등의 온라인 서비스 기능을 공통된 방식으로 액세스할 수 있는 방법을 제공합니다. 여러 플랫폼에 출시하거나 여러 온라인 서비스를 지원하는 게임을 만들 때, 온라인 서브시스템을 사용하면 개발자는 각 지원 서비스에 맞게 구성만 조정해 주면 됩니다.

 

생성자

IOnlineSubsystem* OnlineSubsystem = IOnlineSubsystem::Get();

if (OnlineSubsystem)
{
	OnlineSessionInterface = OnlineSubsystem->GetSessionInterface();
}

 

BeginPlay()

void ASessionManager::BeginPlay()
{
	Super::BeginPlay();

	OnlineSessionInterface->OnCreateSessionCompleteDelegates.AddUObject(this, &ASessionManager::OnCreateSessionComplete);
	OnlineSessionInterface->OnFindSessionsCompleteDelegates.AddUObject(this, &ASessionManager::OnFindSessionComplete);
	OnlineSessionInterface->OnJoinSessionCompleteDelegates.AddUObject(this, &ASessionManager::OnJoinSessionComplete);
	OnlineSessionInterface->OnDestroySessionCompleteDelegates.AddUObject(this, &ASessionManager::OnDestroySessionComplete);
	OnlineSessionInterface->OnStartSessionCompleteDelegates.AddUObject(this, &ASessionManager::OnStartSessionComplete);
}

 

Delegate로 Callback 함수를 지정해 주면 정상적으로 작업을 완료했는지 알 수 있음

 

 

CreateSession()

auto ExistingSession = OnlineSessionInterface->GetNamedSession(SESSION_NAME);
if (ExistingSession != nullptr)
{
	OnlineSessionInterface->DestroySession(SESSION_NAME);
}
else
{
	OnlineSessionInterface->AddOnCreateSessionCompleteDelegate_Handle(CreateSessionCompleteDelegate);

	FOnlineSessionSettings SessionSettings;
	SessionSettings.bIsLANMatch = true;
	SessionSettings.NumPublicConnections = 2;
	SessionSettings.bShouldAdvertise = true;

	OnlineSessionInterface->CreateSession(0, SESSION_NAME, SessionSettings);
}

 

FindSession()

SessionSearch = MakeShareable(new FOnlineSessionSearch());
if (SessionSearch.IsValid()) {
	// SessionSearch->bIsLanQuery = true;
	OnlineSessionInterface->FindSessions(0, SessionSearch.ToSharedRef());

	UE_LOG(LogTemp, Warning, TEXT("Starting Find Session"));
}

 

Delegates

void ASessionManager::OnCreateSessionComplete(FName _SessionName, bool bWasSuccessful)
{
	if (bWasSuccessful)
	{
		UWorld* world = GetWorld();
		if (world)
		{
			world->ServerTravel(FString("/Game/BasicMap?listen"));
		}
	}
	else UE_LOG(LogTemp, Warning, TEXT("Failed to Create Session"));
}

void ASessionManager::OnFindSessionComplete(bool bWasSuccessful)
{
	if (bWasSuccessful && SessionSearch.IsValid() && TestWidget != nullptr) {
		UE_LOG(LogTemp, Warning, TEXT("Finished Find Session"));
		TArray<FString> ServerNames;

		for (const FOnlineSessionSearchResult& t : SessionSearch->SearchResults) {
			UE_LOG(LogTemp, Warning, TEXT("Found Session Names: %s"), *t.GetSessionIdStr());
			ServerNames.Add(*t.GetSessionIdStr());
		}

		TestWidget->SetServerList(ServerNames);
	}
}

void ASessionManager::OnJoinSessionComplete(FName _SessionName, EOnJoinSessionCompleteResult::Type Result)
{

}

void ASessionManager::OnDestroySessionComplete(FName _SessionName, bool bWasSuccessful)
{
	if (bWasSuccessful) CreateGameSession();
}

void ASessionManager::OnStartSessionComplete(FName _SessionName, bool bWasSuccessful)
{
}