Unable to add Physics Handle in script

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#1

Hey guys as the name suggests I am unable to add the “UPhysicsHandleComponent” into the Grabber.h. When I do it says no reference found, when I add include “PhysicsEngine/PhysicsHandleComponent.h” to try and fix that I get a whole bunch of errors in the Grabber.cpp saying "name followd by ‘::’ must be a class or namespace name. It’s like it no longer recognizes the Grabber.h file

here is the grabber.h code

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include “CoreMinimal.h”
#include “Components/ActorComponent.h”
#include “Grabber.generated.h”
#include “PhysicsEngine/PhysicsHandleComponent.h”

UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) )
class BUILDINGESCAPE_API UGrabber : public UActorComponent
{
GENERATED_BODY()

public:
// Sets default values for this component’s properties
UGrabber();

// Called when the game starts
virtual void BeginPlay() override;	

// Called every frame
virtual void TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) override;

private:
// How far ahead of the player can we reach in CM
float Reach = 100.f;

UPhysicsHandleComponent* PhysicsHandle = nullptr;

};

#2

Apologies for the poor formatting in the above.

I think I may have fixed the problem. It seems that you have to have the #include “Grabber.generated.h” as the last one in the #include 's list otherwise it doesn’t work.

Can anybody confirm that?

so my includes now looks like this

#include “CoreMinimal.h”
#include “Components/ActorComponent.h”
#include “PhysicsEngine/PhysicsHandleComponent.h”
#include “Grabber.generated.h”

1 Like
#3

I was having the same problem what i did was add in the Grabber.h code i put the #includes as you have above and in the Grabber.cpp code i put
#include “Grabber.h”
#include “DrawDebugHelpers.h”
#include “CollisionQueryParams.h”
#include “PhysicsEngine/PhysicsHandleComponent.h”

hopefully this helps if you havn’t fixed it already.

#4

I was having the same annoying problem for a very long time so thank you for sharing this!

#5

This is indeed correct. Whenever you include stuff you have to make sure the classname.generated.h is dead last in the list otherwise you will run into errors.

#6

I am at UE4 4.21.1 and bumped into a similar problem which was caused by a different line.

my Grabber.h included

#include "CoreMinimal.h"
#include "Components/ActorComponent.h"
#include "PhysicsEngine/PhysicsHandleComponent.h"
#include "Grabber.generated.h"

which broke GENERATED_BODY() macro with the following error:

Error (active) E0077 this declaration has no storage class or type specifier BuildingEscape

this might as well be in mandarin as far as my knowledge of UE4 goes :stuck_out_tongue:

The fix was to remove #include "CoreMinimal.h".
Everything compiles and works as expected after removing this include, however I have no I idea what this header file brings and why it was safe to remove it.

Thanks

EDIT:
Apparently, what I have just found out is that this is ONLY an IntellySense issue.
Installed a trial version of VisualAssist X just now and it all shows up correctly.

#7

Using Unreal 4.21.1 and VS Community 2017 14.16.27023, I had same issues as @dmitrymatveev. GENERATED_BODY() produced the same error message. SUPER:BeginPlay(); and Super::TickComponent(DeltaTime, TickTyoe, ThisTickFunction): produced errors showing they had not been defined. The UE_LOG line for the physics handle produced an error that an expression was required though the line was completed identically to the lecture solution. Could not compile the solution.

I closed VS and reopened. All errors vanished. Project compiled. It looks like VS was having some sort of issue realted to inclusion of PhysicsHandleComponent.h.

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