Calling a C++ funtion from an ActorComponent in a Blueprint

Development Programming & Scripting C++
1

Hello,

I’m writting some code in a class that inherits from ActorComponent. The idea is to make a helper. I’ve a some public function which are BlueprintCallable or BlueprintPure, but I can’t access them from my blueprint. This is my code:

UCLASS(ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) )
class TESTUE_API UVRHelper : public UActorComponent
{
GENERATED_BODY()

public:
UVRHelper();

protected:
virtual void BeginPlay() override;

public:
UFUNCTION(BlueprintPure, Category=“VRHelper”)
FString GetDriverName();

UFUNCTION(BlueprintPure, Category="VRHelper")

int GetHandness();

UFUNCTION(BlueprintPure, Category="VRHelper")

bool IsHandConnected(bool left);

UFUNCTION(BlueprintCallable, Category="VRHelper")

void Recenter();
};

I’ve created a Blueprint that inherits from Pawn and then attached a VRHelper ActorComponent (this code so) on it. I want to call one of those functions but it doesn’t work.
Do you know why? I’m pretty new to C++ in Unreal, I probably made a mistake.

Thanks!

2

You need a variable to the Component to access those functions ( dropping component on graph )

3

Your code above should work. How exactly are you trying to call the functions? You need to get the component on to the graph and call it from there.

4

You need a pointer to an instance of your class in Blueprint. Either that or you’ve forgotten to compile.

5

@NedimH yes I’ve attached an instance of the component in my blueprint, then I drag it on the graph and try to call the function from it. But the functions don’t appear.
@DanteWingates I’ve already one. To compile I use the big compile button in the editor. Do I have to compile from Visual Studio too?

6

You have to close the editor then cleanup hotreload binaries and rebuild… Then open the editor again.

7

Great thanks!