MeleeWeapon.cpp Errors

Development Programming & Scripting
1

But what error do you get?

2

Hi guys)) I’m working on my project with some help from book “Learning C++ by creating games in unreal engine 4”. Book was written for older versions of engine and right now I have a problem with MeleeWeapon.cpp file in lines
if (Swinging && OtherActor != WeaponHolder && !ThingsHit.Contains(OtherActor)) and OtherActor->TakeDamage(AttackDamage + WeaponHolder->BaseAttackDamage, FDamageEvent(), NULL, this);

// Fill out your copyright notice in the Description page of Project Settings.

#include "Viking_Test.h"
#include "MeleeWeapon.h"
    
AMeleeWeapon::AMeleeWeapon(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer)
{
	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

	AttackDamage = 16;
	Swinging = false;
	WeaponHolder = NULL;
	Mesh = ObjectInitializer.CreateDefaultSubobject<UStaticMeshComponent>(this,TEXT("Mesh"));
	RootComponent = Mesh;
	ProxBox = ObjectInitializer.CreateDefaultSubobject<UBoxComponent>(this,TEXT("ProxBox"));
	ProxBox->OnComponentBeginOverlap.AddDynamic(this, &AMeleeWeapon::Prox);
	ProxBox->AttachTo(RootComponent);
}

// Called when the game starts or when spawned
void AMeleeWeapon::BeginPlay()
{
	Super::BeginPlay();
	
}

// Called every frame
void AMeleeWeapon::Tick( float DeltaTime )
{
	Super::Tick( DeltaTime );

}

void AMeleeWeapon::Prox_Implementation(AActor* OtherActor, UPrimitiveComponent* OtherComp,
	int32 OtherBodyIndex, bool bFromSweep, const FHitResult &SweepResult)
{
	//dont hit non root components
		if (OtherComp != OtherActor->GetRootComponent())
	{
		return;
	}

		//avoid hitting things while sword isnt swinging
		//avoid hitting yourself
		//avoid hitting OtherActor twice
		if (Swinging && OtherActor != WeaponHolder && !ThingsHit.Contains(OtherActor))
	{
		OtherActor->TakeDamage(AttackDamage + WeaponHolder->BaseAttackDamage, FDamageEvent(), NULL, this);
		ThingsHit.Add(OtherActor);
	}
}


void AMeleeWeapon::Swing()
{
	ThingsHit.Empty(); // empty the list
	Swinging = true;
} 

void AMeleeWeapon::Rest()
{
	ThingsHit.Empty();
	Swinging = false;
}

Here is BotCharacter.cpp code:

// Fill out your copyright notice in the Description page of Project Settings.

#include "Viking_Test.h"
#include "BotCharacter.h"
#include "Viking_TestCharacter.h"

ABotCharacter::ABotCharacter(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer)
{
	Speed = 20;
	HitPoints = 20;
	Experience = 0;
	BPLoot = NULL;
	BaseAttackDamage = 16;
	AttackTimeout = 2.f;
	TimeSinceLastStrike = 0;

	SightSphere = ObjectInitializer.CreateDefaultSubobject<USphereComponent>(this,
		TEXT("SightSphere"));
	SightSphere->AttachTo(RootComponent);
	AttackRangeSphere = ObjectInitializer.CreateDefaultSubobject <USphereComponent>(this,
		TEXT("AttackRangeSphere"));
	AttackRangeSphere->AttachTo(RootComponent);
}

// Called when the game starts or when spawned
void ABotCharacter::BeginPlay()
{
	Super::BeginPlay();
	
}

// Called every frame
void ABotCharacter::Tick( float DeltaTime )
{
	Super::Tick( DeltaTime );

	// basic intel : move the monster towards the player
	AViking_TestCharacter *viking = Cast<AViking_TestCharacter>(UGameplayStatics::GetPlayerPawn((), 0));
	if (!viking) return;
	FVector toPlayer = viking->GetActorLocation() - GetActorLocation();
	float distancetoPlayer = toPlayer.Size();
	// If the player is not in the SightSphere of the monster, go back
	if (distancetoPlayer > SightSphere->GetScaledSphereRadius())
	{
		return;
	}

	//toPlayer.Normalize(); // reduce to unit vector
	toPlayer /= distancetoPlayer; // normalizes the vector

	// Actually move the monster towards the player a bit
	AddMovementInput(toPlayer, Speed*2);

	// At least face the target
	//Gets you the rotator to turn something that looks in the `toPlayer` direction
	FRotator toPlayerRotation = toPlayer.Rotation();
	toPlayerRotation.Pitch = 0; // 0 off the pitch
	RootComponent->SetWorldRotation(toPlayerRotation);
}

// Called to bind functionality to input
void ABotCharacter::SetupPlayerInputComponent(class UInputComponent* InputComponent)
{
	Super::SetupPlayerInputComponent(InputComponent);
}
3

Sorry for late answer.
С2446 !=: no conversion “ABotCharacter*” in “AActor*”

C2440 !=: can not be converted “ABotCharacter*” in “AActor*”

С2027 the use of indeterminate type “ABotCharacter*”

С2227 the expression on the left of “->BaseAttackDamage” should indicate the type of class, structure or union or a generic type

88364-capture3.png
88364-capture3.png1912×905 83.5 KB

4

If your WeaponHolder is a ABotCharacter you need to include BotCharacter.h in MeleeWeapon.cpp.
Otherwise your compiler can’t find the definition of BaseAttackDamage

You should also have a forward declaration in your .h like: class ABotCharacter;

5

Thank you))) I just forgot to add #include “BotCharacter.h” and that’s all. Thank you again))