[UE] Multiplayer 8: Menu에서 Session 참가(Join)하기

 

 

목차

 

 

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Menu에서 Session 참가(Join)하기

 

 

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MultiplayerSessionsSubsystem

 

 

MultiplayerSessionsSubsystem.h

#pragma once
#include "CoreMinimal.h"
#include "Subsystems/GameInstanceSubsystem.h"
#include "Interfaces/OnlineSessionInterface.h"
#include "MultiplayerSessionsSubsystem.generated.h"
 
//
// Delcaring our own custom delegates for the Menu class to bind callbacks to
//
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FMultiplayerOnCreateSessionComplete, bool, bWasSuccessful);
DECLARE_MULTICAST_DELEGATE_TwoParams(FMultiplayerOnFindSessionsComplete, const TArray<FOnlineSessionSearchResult>& SessionResults, bool bWasSuccessful);
DECLARE_MULTICAST_DELEGATE_OneParam(FMultiplayerOnJoinSessionComplete, EOnJoinSessionCompleteResult::Type Result);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FMultiplayerOnDestroySessionComplete, bool, bWasSuccessful);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FMultiplayerOnStartSessionComplete, bool, bWasSuccessful);
 
UCLASS()
class MULTIPLAYERSESSIONS_API UMultiplayerSessionsSubsystem : public UGameInstanceSubsystem
{
	GENERATED_BODY()
 
public:
	UMultiplayerSessionsSubsystem();
 
	//
	// To handle session functionality. The Menu class will call these
	//
	void CreateSession(int32 NumPublicConnections, FString MatchType);
	void FindSessions(int32 MaxSearchResults);
	void JoinSession(const FOnlineSessionSearchResult& SessionResult);
	void DestroySession();
	void StartSession();
 
	//
	// Our own custom delegates for the Menu class to bind callbacks to
	//
	FMultiplayerOnCreateSessionComplete MultiplayerOnCreateSessionComplete;
	FMultiplayerOnFindSessionsComplete MultiplayerOnFindSessionsComplete;
	FMultiplayerOnJoinSessionComplete MultiplayerOnJoinSessionComplete;
	FMultiplayerOnDestroySessionComplete MultiplayerOnDestroySessionComplete;
	FMultiplayerOnStartSessionComplete MultiplayerOnStartSessionComplete;
 
protected:
	// Internal callbacks for the delegates we'll add to the Online Session Interface delegate list.
	// 아래의 함수들은 이 클래스 밖에서 콜하지 않는다.
	void OnCreateSessionComplete(FName SessionName, bool bWasSuccessful);
	void OnFindSessionsComplete(bool bWasSuccessful);
	void OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result);
	void OnDestroySessionComplete(FName SessionName, bool bWasSuccessful);
	void OnStartSessionComplete(FName SessionName, bool bWasSuccessful);
 
private:
	IOnlineSessionPtr SessionInterface;
	TSharedPtr<FOnlineSessionSettings> LastSessionSettings;
	TSharedPtr<FOnlineSessionSearch> LastSessionSearch;
 
	//
	// To add to the Online Session Interface delegate list.
	// We'll bind our MultiplayerSessionsSubsystem internal callbacks to these.
	//
	FOnCreateSessionCompleteDelegate CreateSessionCompleteDelegate;
	FDelegateHandle CreateSessionCompleteDelegateHandle;
	FOnFindSessionsCompleteDelegate FindSessionsCompleteDelegate;
	FDelegateHandle FindSessionsCompleteDelegateHandle;
	FOnJoinSessionCompleteDelegate JoinSessionCompleteDelegate;
	FDelegateHandle JoinSessionCompleteDelegateHandle;
	FOnDestroySessionCompleteDelegate DestroySessionCompleteDelegate;
	FDelegateHandle DestroySessionCompleteDelegateHandle;
	FOnStartSessionCompleteDelegate StartSessionCompleteDelegate;
	FDelegateHandle StartSessionCompleteDelegateHandle;
};

변수 추가

• TSharedPtr<FOnlineSessionSearch> LastSessionSearch;

 

 

 

 

MultiplayerSessionsSubsystem.cpp

#include "MultiplayerSessionsSubsystem.h"
#include "OnlineSubsystem.h"
#include "OnlineSessionSettings.h"
 
UMultiplayerSessionsSubsystem::UMultiplayerSessionsSubsystem(): //Delegate을 만들어 On~함수에 연결한다.
	CreateSessionCompleteDelegate(FOnCreateSessionCompleteDelegate::CreateUObject(this, &ThisClass::OnCreateSessionComplete)),
	FindSessionsCompleteDelegate(FOnFindSessionsCompleteDelegate::CreateUObject(this, &ThisClass::OnFindSessionsComplete)),
	JoinSessionCompleteDelegate(FOnJoinSessionCompleteDelegate::CreateUObject(this, &ThisClass::OnJoinSessionComplete)),
	DestroySessionCompleteDelegate(FOnDestroySessionCompleteDelegate::CreateUObject(this, &ThisClass::OnDestroySessionComplete)),
	StartSessionCompleteDelegate(FOnStartSessionCompleteDelegate::CreateUObject(this, &ThisClass::OnStartSessionComplete))
{
	IOnlineSubsystem* Subsystem = IOnlineSubsystem::Get();
	if (Subsystem)
	{
		SessionInterface = Subsystem->GetSessionInterface();//SessionInterface 변수에 IOnlineSubsystem의 SessionInterface 정보를 담는다.
	}
}
 
void UMultiplayerSessionsSubsystem::CreateSession(int32 NumPublicConnections, FString MatchType)
{
	if (!SessionInterface.IsValid())
	{
		return;
	}
 
	//이미 존재하는 Session이 있다면 제거해준다.
	auto ExistingSession = SessionInterface->GetNamedSession(NAME_GameSession);
	if (ExistingSession != nullptr)
	{
		SessionInterface->DestroySession(NAME_GameSession);
	}
 
	// 새로 만드는 Session을 세팅해준다.
	// FDelegateHandle 내에 delegate을 저장한다. 그리고 추후에 Delegate List에서 제거한다.
	// Store the delegate in a FDelegateHandle so we can later remove it from the delegate list
	CreateSessionCompleteDelegateHandle = SessionInterface->AddOnCreateSessionCompleteDelegate_Handle(CreateSessionCompleteDelegate);
 
	LastSessionSettings = MakeShareable(new FOnlineSessionSettings());
	LastSessionSettings->bIsLANMatch = IOnlineSubsystem::Get()->GetSubsystemName() == "NULL" ? true : false;//Steam Subsystem에 연결하는 경우는 LAN Match가 아니다. NULL Subsystem을 사용하는 경우 LAN Match다.
	LastSessionSettings->NumPublicConnections = NumPublicConnections;//함수 Input값을 적용. 접속 가능한 Players 수 제한
	LastSessionSettings->bAllowJoinInProgress = true;//Session이 on going일 때 참가할 수 있게 설정. Session이 실행중일 때 Player들이 원할 때 들어올 수 있음
	LastSessionSettings->bAllowJoinViaPresence = true;//Steam 기준에서 같은 region에 있는 Player들만 들어올 수 있게 설정.
	LastSessionSettings->bShouldAdvertise = true;//Steam에서 Advertise가 가능하여 사람들이 찾아 들어올 수 있게 한다.
	LastSessionSettings->bUsesPresence = true;//같은 region에서 session을 찾을 수 있게 해준다.
	LastSessionSettings->Set(FName("MatchType"), MatchType, EOnlineDataAdvertisementType::ViaOnlineServiceAndPing);
 
	const ULocalPlayer* LocalPlayer = GetWorld()->GetFirstLocalPlayerFromController();
	if (false == SessionInterface->CreateSession(*LocalPlayer->GetPreferredUniqueNetId(), NAME_GameSession, *LastSessionSettings))//CreateSession 리턴값이 false라면(=Session 만들기에 실패한다면)
	{
		//Delegate Handle를 사용하여 Delegate List에서 제거한다.
		SessionInterface->ClearOnCreateSessionCompleteDelegate_Handle(CreateSessionCompleteDelegateHandle);
 
		// 헤더에서 만든 MultiplayerOnCreateSessionComplete delegate을 Broadcast 해준다.
		// Broadcast our own custom delegate
		MultiplayerOnCreateSessionComplete.Broadcast(false);//위의 if조건에서는 false
	}
}
 
void UMultiplayerSessionsSubsystem::FindSessions(int32 MaxSearchResults)
{
	if (false == SessionInterface.IsValid())
	{
		return;
	}
 
	//MultiplayerSessionsSubsystem.h 내의 FindSessionsCompleteDelegate을 연결시킨다.
	FindSessionsCompleteDelegateHandle = SessionInterface->AddOnFindSessionsCompleteDelegate_Handle(FindSessionsCompleteDelegate);
 
	LastSessionSearch = MakeShareable(new FOnlineSessionSearch());//생성
	LastSessionSearch->MaxSearchResults = MaxSearchResults;//DevID 찾기 최대 개수.
	LastSessionSearch->bIsLanQuery = IOnlineSubsystem::Get()->GetSubsystemName() == "NULL" ? true : false;//Steam Subsystem에 연결하는 경우는 LAN Match가 아니다. NULL Subsystem을 사용하는 경우 LAN Match다.
	LastSessionSearch->QuerySettings.Set(SEARCH_PRESENCE, true, EOnlineComparisonOp::Equals);
 
	const ULocalPlayer* LocalPlayer = GetWorld()->GetFirstLocalPlayerFromController();
	if (false == SessionInterface->FindSessions(*LocalPlayer->GetPreferredUniqueNetId(), LastSessionSearch.ToSharedRef()))//FindSession 리턴값이 false라면(=Session 찾기에 실패했다면)
	{
		//Delegate Handle를 사용하여 FindSessionsCompleteDelegateHandle을 Delegate List에서 제거한다.
		SessionInterface->ClearOnFindSessionsCompleteDelegate_Handle(FindSessionsCompleteDelegateHandle);
 
		//헤더에서 만든 MultiplayerOnFindSessionComplete delegate을 Broadcast 해준다.
		MultiplayerOnFindSessionsComplete.Broadcast(TArray<FOnlineSessionSearchResult>(), false);//menu가 이 Broadcast를 받을 때 false로 받으면 FOnlineSessionSearchResult 배열이 비어있다는 것을 알 수 있다.
	}
}
 
void UMultiplayerSessionsSubsystem::JoinSession(const FOnlineSessionSearchResult& SessionResult)
{
	if (false == SessionInterface.IsValid())//SessionInterface가 없다면
	{
		//Menu에 UnknownError라고(=JoinSession 할 수 없다고) 알려준다. 
		MultiplayerOnJoinSessionComplete.Broadcast(EOnJoinSessionCompleteResult::UnknownError);
		return;
	}
 
	JoinSessionCompleteDelegateHandle = SessionInterface->AddOnJoinSessionCompleteDelegate_Handle(JoinSessionCompleteDelegate);
 
	const ULocalPlayer* LocalPlayer = GetWorld()->GetFirstLocalPlayerFromController();
	if (false == SessionInterface->JoinSession(*LocalPlayer->GetPreferredUniqueNetId(), NAME_GameSession, SessionResult))//JoinSession 리턴값이 false라면(=Session Join에 실패했다면)
	{
		SessionInterface->ClearOnJoinSessionCompleteDelegate_Handle(JoinSessionCompleteDelegateHandle);
 
		MultiplayerOnJoinSessionComplete.Broadcast(EOnJoinSessionCompleteResult::UnknownError);
	}
}
 
void UMultiplayerSessionsSubsystem::DestroySession()
{
}
 
void UMultiplayerSessionsSubsystem::StartSession()
{
}
 
void UMultiplayerSessionsSubsystem::OnCreateSessionComplete(FName SessionName, bool bWasSuccessful)
{
	//SessionInterfaces의 Delegate을 지워준다.
	if (SessionInterface)
	{
		SessionInterface->ClearOnCreateSessionCompleteDelegate_Handle(CreateSessionCompleteDelegateHandle);
	}
	//MultiplayerOnCreateSessionComplete delegate를 Broadcast 해준다. 이렇게하면 Menu 클래스는 callback function 가지게 된다.
	MultiplayerOnCreateSessionComplete.Broadcast(bWasSuccessful);
}
 
//Session을 성공적으로 찾은 경우 콜 되는 함수 
void UMultiplayerSessionsSubsystem::OnFindSessionsComplete(bool bWasSuccessful)
{
	if (SessionInterface)
	{
		SessionInterface->ClearOnFindSessionsCompleteDelegate_Handle(FindSessionsCompleteDelegateHandle);
	}
 
	if (LastSessionSearch->SearchResults.Num() <= 0)//SearchResults 배열 결과값을 순회에서 찾았을 때, 찾은것이 0이하라면(=아무것도 찾지 못했다면)
	{
		MultiplayerOnFindSessionsComplete.Broadcast(TArray<FOnlineSessionSearchResult>(), false);//menu가 이 Broadcast를 받을 때 false로 받으면 FOnlineSessionSearchResult 배열이 비어있다는 것을 알 수 있다.
		return;//밑의 코드가 진행되지 않도록 여기서 리턴 시켜준다.
	}
 
	MultiplayerOnFindSessionsComplete.Broadcast(LastSessionSearch->SearchResults, bWasSuccessful);
}
 
void UMultiplayerSessionsSubsystem::OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result)
{
	if (SessionInterface)
	{
		SessionInterface->ClearOnJoinSessionCompleteDelegate_Handle(JoinSessionCompleteDelegateHandle);
	}
 
	//EOnJoinSessionCompleteResult를 Broadcast 해준다.
	MultiplayerOnJoinSessionComplete.Broadcast(Result);
}
 
void UMultiplayerSessionsSubsystem::OnDestroySessionComplete(FName SessionName, bool bWasSuccessful)
{
}
 
void UMultiplayerSessionsSubsystem::OnStartSessionComplete(FName SessionName, bool bWasSuccessful)
{
}

void UMultiplayerSessionsSubsystem::FindSessions(int32 MaxSearchResults)

• if (false == SessionInterface.IsValid())
          return;
•  FindSessionsCompleteDelegateHandle = SessionInterface->AddOnFindSessionsCompleteDelegate_Handle (FindSessionsCompleteDelegate);
• LastSessionSearch = MakeShareable(new FOnlineSessionSearch());
• LastSessionSearch->MaxSearchResults = MaxSearchResults;
• LastSessionSearch->bIsLanQuery = IOnlineSubsystem::Get()->GetSubsystemName() == "NULL" ? true : false;
• LastSessionSearch->QuerySettings.Set(SEARCH_PRESENCE, true, EOnlineComparisonOp::Equals);
• const ULocalPlayer* LocalPlayer = GetWorld()->GetFirstLocalPlayerFromController();
      if (false == SessionInterface->FindSessions(*LocalPlayer->GetPreferredUniqueNetId(), LastSessionSearch.ToSharedRef()))
      {
          SessionInterface->ClearOnFindSessionsCompleteDelegate_Handle(FindSessionsCompleteDelegateHandle);
  
          MultiplayerOnFindSessionsComplete.Broadcast(TArray<FOnlineSessionSearchResult>(), false); 
      }

 

void UMultiplayerSessionsSubsystem::JoinSession(const FOnlineSessionSearchResult& SessionResult)

• if (false == SessionInterface.IsValid())
      {
          MultiplayerOnJoinSessionComplete.Broadcast(EOnJoinSessionCompleteResult::UnknownError);
          return;
      }
• JoinSessionCompleteDelegateHandle = SessionInterface->AddOnJoinSessionCompleteDelegate_Handle (JoinSessionCompleteDelegate);
• const ULocalPlayer* LocalPlayer = GetWorld()->GetFirstLocalPlayerFromController();
• if (false == SessionInterface->JoinSession(*LocalPlayer->GetPreferredUniqueNetId(), NAME_GameSession, SessionResult))
      {
          SessionInterface->ClearOnJoinSessionCompleteDelegate_Handle(JoinSessionCompleteDelegateHandle);
  
          MultiplayerOnJoinSessionComplete.Broadcast(EOnJoinSessionCompleteResult::UnknownError);
      }

 

void UMultiplayerSessionsSubsystem::OnFindSessionsComplete(bool bWasSuccessful)

• if (SessionInterface)
      {
          SessionInterface->ClearOnFindSessionsCompleteDelegate_Handle(FindSessionsCompleteDelegateHandle);
      }
  
      if (LastSessionSearch->SearchResults.Num() <= 0)
      {
          MultiplayerOnFindSessionsComplete.Broadcast(TArray<FOnlineSessionSearchResult>(), false);
          return;
      }
  
      MultiplayerOnFindSessionsComplete.Broadcast(LastSessionSearch->SearchResults, bWasSuccessful);

 

void UMultiplayerSessionsSubsystem::OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result)

•     if (SessionInterface)
      {
          SessionInterface->ClearOnJoinSessionCompleteDelegate_Handle(JoinSessionCompleteDelegateHandle);
      }
      MultiplayerOnJoinSessionComplete.Broadcast(Result);

 

 

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Menu

 

 

Menu.h

#pragma once
#include "CoreMinimal.h"
#include "Blueprint/UserWidget.h"
#include "Interfaces/OnlineSessionInterface.h"//EOnJoinSessionCompleteResult 사용을 위한 헤더
#include "Menu.generated.h"
 
UCLASS()
class MULTIPLAYERSESSIONS_API UMenu : public UUserWidget
{
	GENERATED_BODY()
 
public:
	UFUNCTION(BlueprintCallable)
		void MenuSetup(int32 NumberOfPublicConnections = 4, FString TypeOfMatch = FString(TEXT("FreeForAll")));//접속할 수 있는 Player 숫자를 input으로 만들고 4를 기본값으로 설정한다.
 
protected:
 
	virtual bool Initialize() override;
	virtual void OnLevelRemovedFromWorld(ULevel* InLevel, UWorld* InWorld) override;//다른 Level로 이동하면 기존의 Level을 지우는 함수.
 
	//
	// Callbacks for the custom delegates on the MultiplayerSessionsSubsystem
	// MultiplayerSessionsSubsystem.h의 Dynamic Delegate과 연결된다. Dynamic과 연결되는 경우 UFUNCTION()을 꼭 붙여야 한다. 붙이지 않으면 dynamic delegate과 연결되지 않는다.
	UFUNCTION()
	void OnCreateSession(bool bWasSuccessful);
	void OnFindSessions(const TArray<FOnlineSessionSearchResult>& SessionResults, bool bWasSuccessful);
	void OnJoinSession(EOnJoinSessionCompleteResult::Type Result);
	UFUNCTION()
	void OnDestroySession(bool bWasSuccessful);
	UFUNCTION()
	void OnStartSession(bool bWasSuccessful);
 
private:
	//meta = (BindWidget)을 사용하면 BP의 Button Widget이 아래의 변수와 연결된다. 이 때 BP와 C++변수 이름은 일치하여야 한다.
	UPROPERTY(meta = (BindWidget))
		class UButton* HostButton;
 
	UPROPERTY(meta = (BindWidget))
		UButton* JoinButton;
 
	UFUNCTION()
		void HostButtonClicked();
 
	UFUNCTION()
		void JoinButtonClicked();
 
	void MenuTearDown();
 
	// The subsystem designed to handle all online session functionality
	class UMultiplayerSessionsSubsystem* MultiplayerSessionsSubsystem;
	
	int32 NumPublicConnections{ 4 };
	FString MatchType{ TEXT("FreeForAll") };
};

변경사항 없음.

 

 

 

 

Menu.cpp

#include "Menu.h"
#include "Components/Button.h"
#include "MultiplayerSessionsSubsystem.h"
#include "OnlineSessionSettings.h"
#include "OnlineSubsystem.h"
 
void UMenu::MenuSetup(int32 NumberOfPublicConnections, FString TypeOfMatch)
{
	NumPublicConnections = NumberOfPublicConnections;
	MatchType = TypeOfMatch;
	AddToViewport();
	SetVisibility(ESlateVisibility::Visible);
	bIsFocusable = true;
 
	UWorld* World = GetWorld();
	if (World)
	{
		APlayerController* PlayerController = World->GetFirstPlayerController();
		if (PlayerController)
		{
			FInputModeUIOnly InputModeData;
			InputModeData.SetWidgetToFocus(TakeWidget());
			InputModeData.SetLockMouseToViewportBehavior(EMouseLockMode::DoNotLock);
			PlayerController->SetInputMode(InputModeData);
			PlayerController->SetShowMouseCursor(true);
		}
	}
 
	UGameInstance* GameInstance = GetGameInstance();
	if (GameInstance)
	{
		//헤더에서 만든 MultiplayerSessionsSubsystem 변수에 Subsystem을 리턴 값을 넣어준다.
		MultiplayerSessionsSubsystem = GameInstance->GetSubsystem<UMultiplayerSessionsSubsystem>();
	}
 
	if (MultiplayerSessionsSubsystem)
	{
		//callback을 Bind해준다.
		MultiplayerSessionsSubsystem->MultiplayerOnCreateSessionComplete.AddDynamic(this, &ThisClass::OnCreateSession);//Dynamic을 Bind하는 경우는 AddDynamic 사용.
		MultiplayerSessionsSubsystem->MultiplayerOnFindSessionsComplete.AddUObject(this, &ThisClass::OnFindSessions);//Dynamic이 아닌 것을 Bind하는 경우는 AddUObject 사용.
		MultiplayerSessionsSubsystem->MultiplayerOnJoinSessionComplete.AddUObject(this, &ThisClass::OnJoinSession);
		MultiplayerSessionsSubsystem->MultiplayerOnDestroySessionComplete.AddDynamic(this, &ThisClass::OnDestroySession);
		MultiplayerSessionsSubsystem->MultiplayerOnStartSessionComplete.AddDynamic(this, &ThisClass::OnStartSession);
	}
}
 
bool UMenu::Initialize()
{
	//Super버젼이 false면 false를 리턴한다.(=상위 클래스에서 Initialize 하는게 없으면 false를 리턴하여 Initialize()를 하지 않는다.)
	if (!Super::Initialize())
	{
		return false;
	}
 
	if (HostButton)
	{
		//HostButton 클릭할 때 발생하는 이벤트를 Delegate로 연결해준다.
		HostButton->OnClicked.AddDynamic(this, &ThisClass::HostButtonClicked);
	}
	if (JoinButton)
	{
		//JoinButton 클릭할 때 발생하는 이벤트를 Delegate로 연결해준다.
		JoinButton->OnClicked.AddDynamic(this, &ThisClass::JoinButtonClicked);
	}
 
	return true;
}
 
void UMenu::OnLevelRemovedFromWorld(ULevel* InLevel, UWorld* InWorld)
{
	MenuTearDown();//Widget을 뷰포트에서 지우고 input mode가 리셋된다.
	Super::OnLevelRemovedFromWorld(InLevel, InWorld);
}
 
void UMenu::OnCreateSession(bool bWasSuccessful)
{
	if (bWasSuccessful)
	{
		if (GEngine)
		{
			GEngine->AddOnScreenDebugMessage(
				-1,
				15.f,
				FColor::Yellow,
				FString(TEXT("Session created successfully!"))
			);
		}
 
		UWorld* World = GetWorld();
		if (World)
		{
			World->ServerTravel("/Game/ThirdPerson/Maps/Lobby?listen");
		}
	}
	else//실패한 경우
	{
		if (GEngine)
		{
			GEngine->AddOnScreenDebugMessage(
				-1,
				15.f,
				FColor::Red,
				FString(TEXT("Failed to create session!"))
			);
		}
	}
}
 
void UMenu::OnFindSessions(const TArray<FOnlineSessionSearchResult>& SessionResults, bool bWasSuccessful)
{
	if (MultiplayerSessionsSubsystem == nullptr)
	{
		return;
	}
 
	for (auto Result : SessionResults)//변수로 받은 SessionResults배열을 순회하며 검색
	{
		FString SettingsValue;
		Result.Session.SessionSettings.Get(FName("MatchType"), SettingsValue);
		//SessionSettings의 결과값이 "MatchType"과 SetingsValue을 가지고 있는지 확인.
		if (SettingsValue == MatchType)
		{
			MultiplayerSessionsSubsystem->JoinSession(Result);
			return;
		}
	}
}
 
void UMenu::OnJoinSession(EOnJoinSessionCompleteResult::Type Result)
{
	//IOnlineSubsystem 사용을 위해 위에 #include "OnlineSubsystem.h" 추가
	IOnlineSubsystem* Subsystem = IOnlineSubsystem::Get();
	if (Subsystem)
	{
		IOnlineSessionPtr SessionInterface = Subsystem->GetSessionInterface();
		if (SessionInterface.IsValid())
		{
			FString Address;
			SessionInterface->GetResolvedConnectString(NAME_GameSession, Address);
 
			APlayerController* PlayerController = GetGameInstance()->GetFirstLocalPlayerController();
			if (PlayerController)
			{
				PlayerController->ClientTravel(Address, ETravelType::TRAVEL_Absolute);
			}
		}
	}
}
 
void UMenu::OnDestroySession(bool bWasSuccessful)
{
}
 
void UMenu::OnStartSession(bool bWasSuccessful)
{
}
 
void UMenu::HostButtonClicked()
{
	//디버깅용
	if (GEngine)
	{
		GEngine->AddOnScreenDebugMessage(
			-1,
			15.f,
			FColor::Yellow,
			FString(TEXT("Host Button Clicked"))
		);
	}
 
	if (MultiplayerSessionsSubsystem)
	{
		MultiplayerSessionsSubsystem->CreateSession(NumPublicConnections, MatchType);//NumPublicConnections 숫자 크기까지 Players 접속 가능
		UWorld* World = GetWorld();
	}
}
 
void UMenu::JoinButtonClicked()
{
	//디버깅 테스트
	if (GEngine)
	{
		GEngine->AddOnScreenDebugMessage(
			-1,
			15.f,
			FColor::Yellow,
			FString(TEXT("Join Button Clicked"))
		);
	}
 
	if (MultiplayerSessionsSubsystem)
	{
		//Steam DevID의 숫자가 클수도 있으니 MaxSearchResults값을 10000으로 넉넉히 잡는다.
		MultiplayerSessionsSubsystem->FindSessions(10000);
	}
}
 
void UMenu::MenuTearDown()
{
	RemoveFromParent();
	UWorld* World = GetWorld();
	if (World)
	{
		APlayerController* PlayerController = World->GetFirstPlayerController();
		if (PlayerController)
		{
			FInputModeGameOnly InputModeData;
			PlayerController->SetInputMode(InputModeData);
			PlayerController->SetShowMouseCursor(false);
		}
	}
}

헤더 추가

• #include "OnlineSubsystem.h"

 

void UMenu::OnFindSessions(const TArray<FOnlineSessionSearchResult>& SessionResults, bool bWasSuccessful)

• SessionResults 중 SettingsValue == MatchType이 있다면 
  • MultiplayerSessionsSubsystem->JoinSession(Result);

 

void UMenu::OnJoinSession(EOnJoinSessionCompleteResult::Type Result)

• IOnlineSubsystem* Subsystem = IOnlineSubsystem::Get();
• SessionInterface->GetResolvedConnectString(NAME_GameSession, Address);

 

void UMenu::JoinButtonClicked()

• if (MultiplayerSessionsSubsystem)
  
  • MultiplayerSessionsSubsystem->FindSessions(10000);

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