How to correctly initialise/use FHitResult*

Development Programming & Scripting
1

Hi All

I’ve got FHitResult* and FCollisionQueryParams*, for my line trace function, in the header file and initialized like this;

FHitResult* RV_Hit = new FHitResult(ForceInit);

FCollisionQueryParams* RV_TraceParams = new FCollisionQueryParams(ForceInit);

just before the function is called in the cpp file. The function returns a true on hit, and then on the next line I try and use the getactor() function in the hit result to find out what class it is;

if (RV_Hit->GetActor()->GetClass()->IsChildOf(AInteractor::StaticClass())) {}

This line is crashing the editor. I can’t see anything wrong with it except maybe the FHitResult isnt working?

Any help/advice would be greatly appreciated…

2

#Try using IsA

And also make sure to check actor is valid before dereferencing it!

AActor* FoundActor = RV_Hit->GetActor();
if(!FoundActor) 
{
  //UE_LOG that actor was not found for some reason
  return;
}

//Is found actor an interactor?
if (FoundActor->IsA(AInteractor::StaticClass())) {}

Let me know if that works!

:slight_smile:

Rama

3

Great, that worked! The first part of your solution was enough!

I didnt use the IsA bit because they aren’t interactors, they just inherit from that class.

4

Thanks!!!

5

Just to clarify your response for other readers, if your classes inherit from AInteractor,

FoundActor->IsA<BaseClass>( )

will return true. If I were to create a class named ABall which inherits from AInteractor, ABall is considered AInteractor and also ABall.