How to create BlueprintNativeEvent with array as input

Development Programming & Scripting Blueprint
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1

Hi, i’m trying to create a blueprint native event with array of vector as input, everything is fine when Function only has BlueprintCallable property,
but after adding UFUCTION(BlueprintNativeEvent, Blueprintcallable, category = “Temp”)
cant compile the code.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Character.h"
#include "EnemyCharacter.generated.h"

UCLASS()
class SINCEREMEN_API AEnemyCharacter : public ACharacter
{
	GENERATED_BODY()

public:
	// Sets default values for this character's properties
	AEnemyCharacter();

protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

	// Called to bind functionality to input
	virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;


	virtual void OnConstruction(const FTransform& Transform) override;

UFUNCTION(BlueprintImplementableEvent, BlueprintCallable, category = "Enemy")
	void TestFucntion(TArray<FVector> InputValues);

and this is error list:

error C2511: 'void AEnemyCharacter::TestFucntion(const TArray<FVector,FDefaultAllocator> &)': overloaded member function not found in 'AEnemyCharacter'
note: see declaration of 'AEnemyCharacter'
error C2352: 'UObject::FindFunctionChecked': illegal call of non-static member function
note: see declaration of 'UObject::FindFunctionChecked'
2

In your description you mention using “blueprint native event”, but in your code sample you are using “blueprint implementable event”. Which one are you wanting to use?

3

It looks like you need to change your function signature to this:

void TestFucntion(const TArray<FVector> & InputValues);
1 Like
4

Hello ,

In order to use the BlueprintNativeEvent specifier, your function should have the “_Implementation” suffix as in its definition. For example:

#Header file#

UFUNCTION(BlueprintNativeEvent, Category = "My Native Events")
void NativeFuncCall(TArray<FVector>& Values);

#Source file#

void AMyClass::NativeFuncCall_Implementation(TArray<FVector>& Values);

Hope this helps.

Thanks,

5

Hello Thanks for reply, i added “_Implementation” in the definition, but adding & to (TArray& Values) doesn’t make the array an output for function?

6

Thank you soo much Steve it fixed the problem, adding const + & make the value as input i didn’t know it

1 Like
7

use ‘const TArray& Values’ instead.

1 Like