[UE] Multiplayer 4: Session 들어가기

 

 

목차

 

 

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Session 들어가기 (=Joining the Session)

 

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MultiplayerCharacter

 

 

MultiplayerCharacter.h

// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Character.h"
#include "Interfaces/OnlineSessionInterface.h"
#include "MultiplayerCharacter.generated.h"

UCLASS(config=Game)
class AMultiplayerCharacter : public ACharacter
{
	GENERATED_BODY()

	/** Camera boom positioning the camera behind the character */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera, meta = (AllowPrivateAccess = "true"))
	class USpringArmComponent* CameraBoom;

	/** Follow camera */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera, meta = (AllowPrivateAccess = "true"))
	class UCameraComponent* FollowCamera;
public:
	AMultiplayerCharacter();

	/** Base turn rate, in deg/sec. Other scaling may affect final turn rate. */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category=Input)
	float TurnRateGamepad;

protected:

	/** Called for forwards/backward input */
	void MoveForward(float Value);

	/** Called for side to side input */
	void MoveRight(float Value);

	/** 
	 * Called via input to turn at a given rate. 
	 * @param Rate	This is a normalized rate, i.e. 1.0 means 100% of desired turn rate
	 */
	void TurnAtRate(float Rate);

	/**
	 * Called via input to turn look up/down at a given rate. 
	 * @param Rate	This is a normalized rate, i.e. 1.0 means 100% of desired turn rate
	 */
	void LookUpAtRate(float Rate);

	/** Handler for when a touch input begins. */
	void TouchStarted(ETouchIndex::Type FingerIndex, FVector Location);

	/** Handler for when a touch input stops. */
	void TouchStopped(ETouchIndex::Type FingerIndex, FVector Location);

protected:
	// APawn interface
	virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;
	// End of APawn interface

public:
	/** Returns CameraBoom subobject **/
	FORCEINLINE class USpringArmComponent* GetCameraBoom() const { return CameraBoom; }
	/** Returns FollowCamera subobject **/
	FORCEINLINE class UCameraComponent* GetFollowCamera() const { return FollowCamera; }

public:
	//Pointer to the online session interface. online session interface를 가리키는 포인터 변수
	IOnlineSessionPtr OnlineSessionInterface;

protected:
	UFUNCTION(BlueprintCallable)
	void CreateGameSession();

	UFUNCTION(BlueprintCallable)
	void JoinGameSession();

	void OnCreateSessionComplete(FName SessionName, bool bWasSuccessful);
	void OnFindSessionsComplete(bool bWasSuccessful);
	void OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result);

private:
	//Delegate 변수들
	FOnCreateSessionCompleteDelegate CreateSessionCompleteDelegate;
	FOnFindSessionsCompleteDelegate FindSessionsCompleteDelegate;
	TSharedPtr<FOnlineSessionSearch> SessionSearch;
	FOnJoinSessionCompleteDelegate JoinSessionCompleteDelegate;
};

함수 추가

• void OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result);

 

변수 추가

• FOnJoinSessionCompleteDelegate JoinSessionCompleteDelegate;

 

 

 

MultiplayerCharacter.cpp

#include "MultiplayerCharacter.h"
#include "Camera/CameraComponent.h"
#include "Components/CapsuleComponent.h"
#include "Components/InputComponent.h"
#include "GameFramework/CharacterMovementComponent.h"
#include "GameFramework/Controller.h"
#include "GameFramework/SpringArmComponent.h"
#include "OnlineSubsystem.h"
#include "OnlineSessionSettings.h"

// AMultiplayerCharacter

AMultiplayerCharacter::AMultiplayerCharacter() :
	CreateSessionCompleteDelegate(FOnCreateSessionCompleteDelegate::CreateUObject(this, &ThisClass::OnCreateSessionComplete)),
	FindSessionsCompleteDelegate(FOnFindSessionsCompleteDelegate::CreateUObject(this, &ThisClass::OnFindSessionsComplete)),
	JoinSessionCompleteDelegate(FOnJoinSessionCompleteDelegate::CreateUObject(this, &ThisClass::OnJoinSessionComplete))
{
	// Set size for collision capsule
	GetCapsuleComponent()->InitCapsuleSize(42.f, 96.0f);

	// set our turn rate for input
	TurnRateGamepad = 50.f;

	// Don't rotate when the controller rotates. Let that just affect the camera.
	bUseControllerRotationPitch = false;
	bUseControllerRotationYaw = false;
	bUseControllerRotationRoll = false;

	// Configure character movement
	GetCharacterMovement()->bOrientRotationToMovement = true; // Character moves in the direction of input...	
	GetCharacterMovement()->RotationRate = FRotator(0.0f, 500.0f, 0.0f); // ...at this rotation rate

	// Note: For faster iteration times these variables, and many more, can be tweaked in the Character Blueprint
	// instead of recompiling to adjust them
	GetCharacterMovement()->JumpZVelocity = 700.f;
	GetCharacterMovement()->AirControl = 0.35f;
	GetCharacterMovement()->MaxWalkSpeed = 500.f;
	GetCharacterMovement()->MinAnalogWalkSpeed = 20.f;
	GetCharacterMovement()->BrakingDecelerationWalking = 2000.f;

	// Create a camera boom (pulls in towards the player if there is a collision)
	CameraBoom = CreateDefaultSubobject<USpringArmComponent>(TEXT("CameraBoom"));
	CameraBoom->SetupAttachment(RootComponent);
	CameraBoom->TargetArmLength = 400.0f; // The camera follows at this distance behind the character	
	CameraBoom->bUsePawnControlRotation = true; // Rotate the arm based on the controller

	// Create a follow camera
	FollowCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("FollowCamera"));
	FollowCamera->SetupAttachment(CameraBoom, USpringArmComponent::SocketName); // Attach the camera to the end of the boom and let the boom adjust to match the controller orientation
	FollowCamera->bUsePawnControlRotation = false; // Camera does not rotate relative to arm

	// Note: The skeletal mesh and anim blueprint references on the Mesh component (inherited from Character) 
	// are set in the derived blueprint asset named ThirdPersonCharacter (to avoid direct content references in C++)

	IOnlineSubsystem* OnlineSubsystem = IOnlineSubsystem::Get();
	if (OnlineSubsystem)
	{
		OnlineSessionInterface = OnlineSubsystem->GetSessionInterface();

		if (GEngine)
		{
			GEngine->AddOnScreenDebugMessage(
				-1,
				15.0f,
				FColor::Blue,
				FString::Printf(TEXT("I found SubSystem %s"), *OnlineSubsystem->GetSubsystemName().ToString())
			);
		}
	}
}

//////////////////////////////////////////////////////////////////////////
// Input

void AMultiplayerCharacter::SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent)
{
	// Set up gameplay key bindings
	check(PlayerInputComponent);
	PlayerInputComponent->BindAction("Jump", IE_Pressed, this, &ACharacter::Jump);
	PlayerInputComponent->BindAction("Jump", IE_Released, this, &ACharacter::StopJumping);

	PlayerInputComponent->BindAxis("Move Forward / Backward", this, &AMultiplayerCharacter::MoveForward);
	PlayerInputComponent->BindAxis("Move Right / Left", this, &AMultiplayerCharacter::MoveRight);

	// We have 2 versions of the rotation bindings to handle different kinds of devices differently
	// "turn" handles devices that provide an absolute delta, such as a mouse.
	// "turnrate" is for devices that we choose to treat as a rate of change, such as an analog joystick
	PlayerInputComponent->BindAxis("Turn Right / Left Mouse", this, &APawn::AddControllerYawInput);
	PlayerInputComponent->BindAxis("Turn Right / Left Gamepad", this, &AMultiplayerCharacter::TurnAtRate);
	PlayerInputComponent->BindAxis("Look Up / Down Mouse", this, &APawn::AddControllerPitchInput);
	PlayerInputComponent->BindAxis("Look Up / Down Gamepad", this, &AMultiplayerCharacter::LookUpAtRate);

	// handle touch devices
	PlayerInputComponent->BindTouch(IE_Pressed, this, &AMultiplayerCharacter::TouchStarted);
	PlayerInputComponent->BindTouch(IE_Released, this, &AMultiplayerCharacter::TouchStopped);
}

void AMultiplayerCharacter::CreateGameSession()
{
	// 1번 키를 눌렀을 때 콜 된다. BP_ThirdPersonCharacter에서 1번 키를 누르면 콜 되게 해줬다.

	if (false == OnlineSessionInterface.IsValid())
	{	//OnlineSessionInterface가 유효하지 않다면 리턴.
		return;
	}

	auto ExistingSession = OnlineSessionInterface->GetNamedSession(NAME_GameSession);
	if (ExistingSession != nullptr)
	{
		OnlineSessionInterface->DestroySession(NAME_GameSession);//Session을 끝낸다.
	}

	//Delegate 연결
	OnlineSessionInterface->AddOnCreateSessionCompleteDelegate_Handle(CreateSessionCompleteDelegate);

	TSharedPtr<FOnlineSessionSettings> SessionSettings = MakeShareable(new FOnlineSessionSettings());
	SessionSettings->bIsLANMatch = false;//Internet으로 연결할 것이므로 LANMatch를 사용하지 않는다.
	SessionSettings->NumPublicConnections = 4;//4명의 Players까지 접속이 가능하게 설정.
	SessionSettings->bAllowJoinInProgress = true;//Session이 실행중일 때 Player들이 원할 때 들어올 수 있음
	SessionSettings->bAllowJoinViaPresence = true;//Steam 기준에서 같은 region에 있는 Player들만 들어올 수 있게 설정.
	SessionSettings->bShouldAdvertise = true;//Steam에서 Advertise가 가능하여 사람들이 찾아 들어올 수 있게 한다.
	SessionSettings->bUsesPresence = true;//같은 region에서 session을 찾을 수 있게 해준다.
	SessionSettings->Set(FName("MatchType"), FString("FreeForAll"), EOnlineDataAdvertisementType::ViaOnlineServiceAndPing);//FreeForAll는 여러개의 MatchType을 가능하게 한다. ViaOnlineServiceAndPing는 Session이 OnlineService와 Ping에서 Advertise된다는 의미.
	SessionSettings->bUseLobbiesIfAvailable = true;//Session을 찾기 힘들때 사용하는 세팅.
	const ULocalPlayer* LocalPlayer = GetWorld()->GetFirstLocalPlayerFromController();
	OnlineSessionInterface->CreateSession(*LocalPlayer->GetPreferredUniqueNetId(), NAME_GameSession, *SessionSettings);//위의 SessionSettings를 만족하는 Session을 생성한다.
}

void AMultiplayerCharacter::JoinGameSession()
{
	//Game Sessions 찾기
	if (false == OnlineSessionInterface.IsValid())
	{
		return;
	}

	//OnlineSessionInterface에 FindSessionsCompleteDelegate을 연결시킨다.
	OnlineSessionInterface->AddOnFindSessionsCompleteDelegate_Handle(FindSessionsCompleteDelegate);

	SessionSearch = MakeShareable(new FOnlineSessionSearch());
	SessionSearch->MaxSearchResults = 10000;//DevID 찾기 최대 개수.
	SessionSearch->bIsLanQuery = false;//LAN을 사용하지 않으므로 false 설정.
	SessionSearch->QuerySettings.Set(SEARCH_PRESENCE, true, EOnlineComparisonOp::Equals);//The query to use for finding matching servers. set조건에 만족하는 서버들을 찾는다.

	const ULocalPlayer* LocalPlayer = GetWorld()->GetFirstLocalPlayerFromController();
	OnlineSessionInterface->FindSessions(*LocalPlayer->GetPreferredUniqueNetId(), SessionSearch.ToSharedRef());
}

void AMultiplayerCharacter::OnCreateSessionComplete(FName SessionName, bool bWasSuccessful)
{
	//Session 생성이 성공한 경우
	if (bWasSuccessful)
	{
		if (GEngine)
		{
			GEngine->AddOnScreenDebugMessage(
				-1,
				15.0f,
				FColor::Blue,
				FString::Printf(TEXT("Created session: %s"), *SessionName.ToString())
			);
		}
		//Lobby라는 Level 맵을 띄운다.
		UWorld* World = GetWorld();
		if (World)
		{
			//원하는 Level를 설정한다.
			World->ServerTravel(FString("/Game/ThirdPerson/Maps/Lobby?listen"));
		}
	}
	//Session 생성이 실패한 경우
	else
	{
		if (GEngine)
		{
			GEngine->AddOnScreenDebugMessage(
				-1,
				15.f,
				FColor::Red,
				FString(TEXT("Failed to create session!"))
			);
		}
	}
}

void AMultiplayerCharacter::OnFindSessionsComplete(bool bWasSuccessful)
{
	//OnlineSessionInterface가 없다면 리턴
	if (false == OnlineSessionInterface.IsValid())
	{
		return;
	}

	//SearchResults를 for문으로 순회
	for (auto Result : SessionSearch->SearchResults)
	{
		FString Id = Result.GetSessionIdStr();
		FString User = Result.Session.OwningUserName;
		FString MatchType;
		Result.Session.SessionSettings.Get(FName("MatchType"), MatchType);//"MatchType"라는 Key가 있다면 MatchType라는 로컬Value에 접근한다.
		if (GEngine)
		{
			GEngine->AddOnScreenDebugMessage(
				-1,
				15.f,
				FColor::Cyan,
				FString::Printf(TEXT("Id: %s, User: %s"), *Id, *User)
			);
		}
		if (MatchType == FString("FreeForAll"))
		{
			if (GEngine)
			{
				GEngine->AddOnScreenDebugMessage(
					-1,
					15.f,
					FColor::Cyan,
					FString::Printf(TEXT("Joining Match Type: %s"), *MatchType)
				);
			}

			//JoinSession이 Complete된 후에 callback이 불려진다.
			OnlineSessionInterface->AddOnJoinSessionCompleteDelegate_Handle(JoinSessionCompleteDelegate);

			const ULocalPlayer* LocalPlayer = GetWorld()->GetFirstLocalPlayerFromController();
			OnlineSessionInterface->JoinSession(*LocalPlayer->GetPreferredUniqueNetId(), NAME_GameSession, Result);//Result는 해당조건을 만족하고 FreeForAll라는 Value를 가지고 있다.
		}
	}
}

//Join Session이 Complete(완료)되면 불려지는 함수.
void AMultiplayerCharacter::OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result)
{
	//OnlineSessionInterface가 없다면 리턴
	if (false == OnlineSessionInterface.IsValid())
	{
		return;
	}

	FString Address;
	if (OnlineSessionInterface->GetResolvedConnectString(NAME_GameSession, Address))
	{
		if (GEngine)
		{
			GEngine->AddOnScreenDebugMessage(
				-1,
				15.f,
				FColor::Yellow,
				FString::Printf(TEXT("Connect string: %s"), *Address)//Address를 Debugging Message로 출력한다.
			);
		}

		APlayerController* PlayerController = GetGameInstance()->GetFirstLocalPlayerController();
		if (PlayerController)
		{
			PlayerController->ClientTravel(Address, ETravelType::TRAVEL_Absolute);
		}
	}
}

void AMultiplayerCharacter::TouchStarted(ETouchIndex::Type FingerIndex, FVector Location)
{
	Jump();
}

void AMultiplayerCharacter::TouchStopped(ETouchIndex::Type FingerIndex, FVector Location)
{
	StopJumping();
}

void AMultiplayerCharacter::TurnAtRate(float Rate)
{
	// calculate delta for this frame from the rate information
	AddControllerYawInput(Rate * TurnRateGamepad * GetWorld()->GetDeltaSeconds());
}

void AMultiplayerCharacter::LookUpAtRate(float Rate)
{
	// calculate delta for this frame from the rate information
	AddControllerPitchInput(Rate * TurnRateGamepad * GetWorld()->GetDeltaSeconds());
}

void AMultiplayerCharacter::MoveForward(float Value)
{
	if ((Controller != nullptr) && (Value != 0.0f))
	{
		// find out which way is forward
		const FRotator Rotation = Controller->GetControlRotation();
		const FRotator YawRotation(0, Rotation.Yaw, 0);

		// get forward vector
		const FVector Direction = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::X);
		AddMovementInput(Direction, Value);
	}
}

void AMultiplayerCharacter::MoveRight(float Value)
{
	if ( (Controller != nullptr) && (Value != 0.0f) )
	{
		// find out which way is right
		const FRotator Rotation = Controller->GetControlRotation();
		const FRotator YawRotation(0, Rotation.Yaw, 0);
	
		// get right vector 
		const FVector Direction = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::Y);
		// add movement in that direction
		AddMovementInput(Direction, Value);
	}
}

AMultiplayerCharacter::AMultiplayerCharacter()에 상속 Delegate 추가하기

• FindSessionsCompleteDelegate(FOnFindSessionsCompleteDelegate::CreateUObject(this, &ThisClass::OnFindSessionsComplete)),
• JoinSessionCompleteDelegate(FOnJoinSessionCompleteDelegate::CreateUObject(this, &ThisClass::OnJoinSessionComplete))

 

 

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

• FString Address;
• if (OnlineSessionInterface->GetResolvedConnectString(NAME_GameSession, Address))
  
  • if (GEngine) { GEngine->AddOnScreenDebugMessage( -1, 15.f, FColor::Yellow, FString::Printf(TEXT("Connect string: %s"), *Address) );
    • //Address를 Debugging Message로 출력한다.
  • APlayerController* PlayerController = GetGameInstance()->GetFirstLocalPlayerController();
  • if (PlayerController) {
    PlayerController->ClientTravel(Address, ETravelType::TRAVEL_Absolute); }

 

 

 

※ 참고: void FOnlineSessionSettings::Set

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