如何修复 Unreal 和 C++ 中的 'Cannot access private member declared in class' 错误

Question

我目前正在学习 Unreal 并使用 C++，在创建碰撞盒时我收到“错误 C2248：'UPrimitiveComponent::bGenerateOverlapEvents'：无法访问在 class 'UPrimitiveComponent' 中声明的私有成员错误显示在 ShipController.cpp 文件的第 18 行。

阅读时建议不要使用 'bGenerateOverlapEvents' 而应使用 'SetGenerateOverlapEvents'，但是虽然编译正确，但碰撞盒无法正常工作。

船舶控制器头文件：

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "ShipController.generated.h"

UCLASS()
class BASICSHOOTER_API AShipController : public APawn
{
    GENERATED_BODY()

public:
    // Sets default values for this pawn's properties
    AShipController();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

public: 
    // Called every frame
    virtual void Tick(float DeltaTime) override;

    // Called to bind functionality to input
    virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;

    UPROPERTY(EditAnywhere)
    UShapeComponent* CollisionBox;

    UPROPERTY(EditAnywhere)
    float Speed = 10.0f;

    UPROPERTY(EditAnywhere, Category="Spawning")
            TSubclassOf<class ABulletController> BulletBlueprint;

    void Move_XAxis(float AxisValue);
    void Move_YAxis(float AxisValue);
    void OnShoot();

    FVector CurrentVelocity;

    bool Died;
    UFUNCTION()
    void OnOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComponent, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);
};

船舶控制器 Cpp 文件

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

#include "ShipController.h"
#include "BulletController.h"
#include "EnemyController.h"
#include "Components/BoxComponent.h"
#include "Kismet/GameplayStatics.h"


// Sets default values
AShipController::AShipController()
{
    // Set this pawn to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = true;

    CollisionBox = CreateDefaultSubobject<UBoxComponent>(TEXT("Root"));
    CollisionBox->bGenerateOverlapEvents = true;
    CollisionBox->OnComponentBeginOverlap.AddDynamic(this, &AShipController::OnOverlap);

    AutoPossessPlayer = EAutoReceiveInput::Player0;
}

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

}

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

    if (!CurrentVelocity.IsZero())
    {
        FVector NewLocation = GetActorLocation() + Speed * CurrentVelocity * DeltaTime;

        SetActorLocation(NewLocation);

    }

}

// Called to bind functionality to input
void AShipController::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);

    InputComponent->BindAxis("MoveX", this, &AShipController::Move_XAxis);
    InputComponent->BindAxis("MoveY", this, &AShipController::Move_YAxis);
    InputComponent->BindAction("Shoot", IE_Pressed, this, &AShipController::OnShoot);
}

void AShipController::Move_XAxis(float AxisValue)
{
    CurrentVelocity.X = AxisValue * 100.0f;
}

void AShipController::Move_YAxis(float AxisValue)
{
    CurrentVelocity.Y = AxisValue * 100.0f;
}

void AShipController::OnShoot()
{
    UWorld* World = GetWorld();

    if (World)
    {
        FVector Location = GetActorLocation();
        World->SpawnActor<ABulletController>(BulletBlueprint, Location, FRotator::ZeroRotator);
    }
}

void AShipController::OnOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComponent, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
    if (OtherActor->IsA(AEnemyController::StaticClass()))
    {
        Died = true;
        this->SetActorHiddenInGame(true);

        UGameplayStatics::SetGamePaused(GetWorld(), true);

    }

}

敌方控制器头文件

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "EnemyController.generated.h"

UCLASS()
class BASICSHOOTER_API AEnemyController : public AActor
{
    GENERATED_BODY()

public: 
    // Sets default values for this actor's properties
    AEnemyController();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

public: 
    // Called every frame
    virtual void Tick(float DeltaTime) override;

    UPROPERTY(EditAnywhere)
    UShapeComponent* RootBox;

    UPROPERTY(EditAnywhere)
    float Speed = -200.0f;
};

敌方控制器 Cpp 文件

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


#include "EnemyController.h"
#include "Components/BoxComponent.h"


// Sets default values
AEnemyController::AEnemyController()
{
    // 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;

    RootBox = CreateDefaultSubobject<UBoxComponent>(TEXT("Root"));
}

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

}

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

    FVector NewLocation = GetActorLocation();

    NewLocation.X += Speed * DeltaTime;
    SetActorLocation(NewLocation);

    if (NewLocation.X < -600.0f)
    {
        this->Destroy();
    }
}

我希望输出是当 class EnemyController 的对象接触到 class ShipController 的对象时游戏将暂停并且 class ShipController 的对象将被隐藏在游戏中。

Answer 1

使用 SetGenerateOverlapEvents(true); 而不是 bGenerateOverlapEvents = true; 确实有效。出于某种原因，我将对象设置在不同的高度并且碰撞盒没有发生碰撞，这就是它似乎不起作用的原因。感谢您的意见和建议！

如何修复 Unreal 和 C++ 中的 'Cannot access private member declared in class' 错误

How to fix 'Cannot access private member declared in class' error in Unreal & C++

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