Use blueprint variable in C++

//블루프린트의 인티저 변수를 리턴한다.
bool GetBluePrintVariable(UObject* Target, FString VariableName, int& OutValue)
{
    UProperty* Prop = Target->GetClass()->FindPropertyByName(*VariableName);
    if (Prop->GetClass() == UIntProperty::StaticClass())
    {
        void* ValueAddr = Prop->ContainerPtrToValuePtr<void>(Target);
        UIntProperty* objectProp = Cast<UIntProperty>(Prop);
       
        OutValue = (int)objectProp->GetSignedIntPropertyValue(ValueAddr); //casting: int64 --> int
        //FString ValueStr = objectProp->GetNumericPropertyValueToString(ValueAddr);
        //int Value = objectProp->GetPropertyValue_InContainer(ValueAddr);  이건 이상한값이 나옴
        //UE_LOG(LogTemp, Log, TEXT("Have UObjectProperty: %s, %d!!!"), *(Target->GetName()), Value);

        return true;
    }

    return false;
}

//블루프린트를 로딩해서 블루프린트의 USplineComponent 컴포넌트에 접근한다.
void ASplineTestGameModeBase::LoadBluePrintTest()
{
    TArray<AActor*> ActorList;
    FName Path = TEXT("Blueprint'/Game/blueprint/Spline_BP.Spline_BP_C'");
    UClass* GeneratedBP = Cast<UClass>(StaticLoadObject(UClass::StaticClass(), NULL, *Path.ToString()));

    UGameplayStatics::GetAllActorsOfClass(GetWorld(), GeneratedBP, ActorList);
    for (int n = 0; n < ActorList.Num(); ++n)
    {
        AActor* Actor = ActorList[n];
        USplineComponent* SplineComponent = Actor->FindComponentByClass<USplineComponent>();
        if (SplineComponent)
        {
            int OutValue = 0;
            if(GetBluePrintVariable(Actor, TEXT("SplineID"), OutValue))
                UE_LOG(LogTemp, Log, TEXT("Have SplineComponent!!!"));
        }
    }
}