c++怎么在UE4或UE5中编写蓝图节点_c++虚幻引擎插件与蓝图扩展开发指南

// MyBlueprintFunctionLibrary.h
#pragma once

#include "CoreMinimal.h"
#include "Kismet/BlueprintFunctionLibrary.h"
#include "MyBlueprintFunctionLibrary.generated.h"

UCLASS()
class MYPROJECT_API UMyBlueprintFunctionLibrary : public UBlueprintFunctionLibrary
{
    GENERATED_BODY()

public:
    // 返回两数之和，可在蓝图中使用
    UFUNCTION(BlueprintPure, Category = "Math")
    static float AddFloats(float A, float B);

    // 带执行引脚的函数（有副作用）
    UFUNCTION(BlueprintCallable, Category = "Game")
    static void PrintToLog(const FString& Message);
};

// MyBlueprintFunctionLibrary.cpp
#include "MyBlueprintFunctionLibrary.h"
#include "Engine/Engine.h"

float UMyBlueprintFunctionLibrary::AddFloats(float A, float B)
{
    return A + B;
}

void UMyBlueprintFunctionLibrary::PrintToLog(const FString& Message)
{
    if (GEngine)
    {
        GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Green, Message);
    }
}

// MyActorComponent.h
UCLASS(ClassGroup=(Custom), meta=(BlueprintSpawnableComponent))
class AMYPROJECT_API UMyActorComponent : public UActorComponent
{
    GENERATED_BODY()

public:
    UFUNCTION(BlueprintCallable, Category = "Movement")
    void LaunchCharacter(float Power);

    UFUNCTION(BlueprintImplementableEvent, Category = "Response")
    void OnSpecialEvent();
};

PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "AIModule", "GameplayTasks", "HeadMountedDisplay" });