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  • [UE4]OnComponentBeginOverlap.AddDynamic 的编译错误

    以 Character 类为例,假设有 PacManCharacter 派生自 Character类
    首先在 PacManCharacter.h 头文件中添加碰撞函数的声明: 

    OnCollision 为自定义的碰撞函数,名称可以任意,但参数形式必须满足以下条件

    UFUNCTION()  
    void OnCollision(class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);  

    然后在 PacManCharacter.cpp 文件中的 SetupPlayerInputComponent 函数中添加绑定函数:

    GetCapsuleComponent()->OnComponentBeginOverlap.AddDynamic(this, &PacManCharacter::OnCollision);  

    碰撞函数的实现:

    void PacManCharacter::OnCollision(class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)  
    {  
      GEngine->AddOnScreenDebugMessage(0, 1.0f, FColor::Red, TEXT("PacMan ! "));  
    }  

    但是以上是老版本的 UE4 支持的格式,编译会报参数类型不匹配的错误

    error C2664: 'void TBaseDynamicMulticastDelegate::__Internal_AddDynamic(UserClass *,void (__cdecl AItem::* )(UPrimitiveComponent *,AActor *,UPrimitiveComponent *,int32,bool,const FHitResult &),FName)':  
     cannot convert argument 2 from 'void (__cdecl AItem::* )(AActor *,UPrimitiveComponent *,int32,bool,const FHitResult &)'   
    to   
    'void (__cdecl AItem::* )(UPrimitiveComponent *,AActor *,UPrimitiveComponent *,int32,bool,const FHitResult &)'  

    新版本的 UE4 应该对碰撞函数进行如下声明和定义:

    UFUNCTION()  
    void OnCollision(class UPrimitiveComponent* HitComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult & SweepResult);  
    void PacManCharacter::OnCollision(class UPrimitiveComponent* HitComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)  
    {  
      GEngine->AddOnScreenDebugMessage(0, 1.0f, FColor::Red, TEXT("PacMan ! "));  
    }  

    即增加了第一个参数  class UPrimitiveComponent* HitComp

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  • 原文地址:https://www.cnblogs.com/timy/p/8645492.html
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