Function GetAllActorsOfClass get error

Development Programming & Scripting
1

Hi all,

I’m trying to use function UGameplayStatics::GetAllActorsOfClass to get all AI Pawn in my scene, but it leads to an error.

ERROR:

  D:\UE_projects\SensorSystem\Source\SensorSystem\Private\SensorCharacter.cpp(45) : error C2664: 'void UGameplayStatics::GetAllActorsOfClass(const UObject *,TSubclassOf<AActor>,TArray<AActor *,FDefaultAllocator> &)': cannot convert argument 3 from 'TArray<ASensorAICharacter *,FDefaultAllocator>' to 'TArray<AActor *,FDefaultAllocator> &'

Header:

	#pragma once

	#include "CoreMinimal.h"
	#include "SensorSystemCharacter.h"
	#include "SensorCharacter.generated.h"


	class ASensorAICharacter;
	/**
	 * 
	 */
	UCLASS()
	class SENSORSYSTEM_API ASensorCharacter : public ASensorSystemCharacter
	{
		GENERATED_BODY()

	public:

		UFUNCTION(BlueprintCallable, Category = Abilities)
		void Fire(bool& IsFire);

		UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = BaseStats)
		bool IsFire = false;

		UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = BaseStats)
		float AttackSpeed = 2.f;

		void FindNearestAIPawn(UObject* ThisLevel, TArray<ASensorAICharacter*> ArrayOfAIPawn);
	};

Cpp:

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


#include "SensorCharacter.h"
#include "SensorAICharacter.h"
//#include "../Runtime/Engine/Machine/BaseFrame.h"
#include "../Runtime/Engine/Classes/Kismet/GameplayStatics.h"



void ASensorCharacter::Fire(bool& IsFire)
{

	IsFire = true;

	TArray<ASensorAICharacter*> FoundActors;
	FindNearestAIPawn(Cast<UObject>(GetWorld()), FoundActors);

}

void ASensorCharacter::FindNearestAIPawn(UObject* ThisLevel, TArray<ASensorAICharacter*> ArrayOfAIPawn)
{
	UGameplayStatics::GetAllActorsOfClass(ThisLevel, ASensorAICharacter::StaticClass(), ArrayOfAIPawn);
	for (AActor* TActor : ArrayOfAIPawn)
	{
		ASensorAICharacter* MyActor = Cast<ASensorAICharacter>(TActor);

		if (MyActor != nullptr) 
		{
			//Calculate distance
		}
	}
}

I’ve tried to google out all solution but there’s no any match solution :cry:

Thank you!

2

UGameplayStatics::GetAllActorsOfClass isn’t a template class so you must pass it an array of AActors* as Third argument not an array of ASensorAICharacter*.

TArray<AActor*> FoundActors;
for (AActor* TActor: FoundActors)
      {
          ASensorAICharacter* MyActor = Cast<ASensorAICharacter>(TActor);
          if(MyActor != nullptr)

Maybe you find https://wiki.unrealengine.com/Iterators:Object%26_Actor_Iterators,_Optional_Class_Scope_For_Faster_Search
helpfull

3

Hey, thank you so much, that’s an exact answer! I’ve solved my own problem!

4

@anonymous_user_5c6a7c61 you’re welcome. if it helped you, please mark the answer as “correct” so it is resolved