Question

我是C ++的新手，而且还是虚幻引擎4的新手。我正在按照教程简单地旋转用c ++创建的对象。视频似乎有点过时，已有六个月了。在一行中，我在行this->SampleMesh->AttachtoComponent(this->RootComponent);表示pointer to incomplete class type is not allowed时收到错误。我一直在寻找方法，但到目前为止还没有运气。如果有人知道更新的方式，甚至是找到最新教程的地方，我将不胜感激。感谢。

Pickup.cpp

#include "Pickup.h"

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

SampleMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("SampleMesh"));

this->SceneComponent = CreateDefaultSubobject<USceneComponent>(TEXT("SceneComponent"));

this->RootComponent = SceneComponent;

this->SampleMesh->AttachtoComponent(this->RootComponent);

//this->SampleMesh->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);

//this->SampleMesh->AttachtoComponent(this->RootComponent, FAttachmentTransformRules::SnapToTargetNotIncludingScale);

//this->SampleMesh->AttachtoComponent(this->SceneComponent);



this->RotationRate = FRotator(0.0f, 180.0f, 0.0f);

this->Speed = 1.0f;
}

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

}

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

this->AddActorLocalRotation(this->RotationRate * DeltaTime * Speed);
}

Pickup.h

#pragma once

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

UCLASS()
class LEARNAGAIN_API APickup : public AActor
{
GENERATED_BODY()

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

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, BluePrintReadWrite, Category = Pickup)
UStaticMeshComponent* SampleMesh;

UPROPERTY(EditAnywhere, BluePrintReadWrite, Category = Pickup)
FRotator RotationRate;

UPROPERTY(EditAnywhere, BluePrintReadWrite, Category = Pickup)
USceneComponent* SceneComponent;

UPROPERTY(EditAnywhere, BluePrintReadWrite, Category = Pickup)
float Speed;

};

Answer 1

我被困在同一个问题上。 Unreal改变了头文件的包含方式。

将以下内容添加到Pickup.cpp：

#include "Classes/Components/StaticMeshComponent.h"

在这种特定情况下，您可以使用SetupAttachment功能而不是AttachToComponent

更详细的回答here。检查this reference guide有关更改的信息。关于SetupAttachment的信息。

虚幻引擎4.18.0，Vs2017，不允许指向不完整类类型的错误指针

1 个答案: