Get keys for action and check if action is pressed

Development Programming & Scripting
1

Hi all,

My new problem is that:

  1. I want to create a function that when the players enter inside a collision box, over the actor, appear “Press [Action Key] to [Action Name]”, for now it works, but i would like to recieve some tips on how to create a better solution that this. I don’t think it’s the best solution possible, but it works :smiley:

  2. When the player is inside the collision box i would like that, when he press the action key, he fires a function of that actor.

For now this is the code:

void ANPC::Interact() {
	if (bCanInteract) {
		UE_LOG(LogTemp, Warning, TEXT("asdlansldkanl"));
	}
}

void ANPC::OnOverlapBegin(UPrimitiveComponent * OverlappedComp, AActor * OtherActor, UPrimitiveComponent * OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult & SweepResult)
{
	TextRenderer->SetHiddenInGame(false);
	TArray<FInputActionKeyMapping> KeysArray = UGameplayStatics::GetPlayerController(GetWorld(), 0)->PlayerInput->GetKeysForAction("Interact");
	FString Text = "PRESS [";
	Text.Append(KeysArray.Last().Key.ToString() + "] TO " + KeysArray.Last().ActionName.ToString());
	TextRenderer->SetText(Text);
	bCanInteract = true;
}

void ANPC::OnOverlapEnd(UPrimitiveComponent * OverlappedComp, AActor * OtherActor, UPrimitiveComponent * OtherComp, int32 OtherBodyIndex)
{
	TextRenderer->SetHiddenInGame(true);
	bCanInteract = false;
}

I don’t know how to solve the second problem, for now i have used blueprint to see when the players click the letter F, but i would like to use c++ only and not checking for when the “F” key is pressed, but when the [Action Key] is pressed.

Thanks,

Davide.

2

Hello Fanto88,

I am not sure how you want to improve the way you get your string, but if it is a generic message along the lines of “Press X to interact” you could store it in an FString once in BeginPlay.

To assign a function to an action mapping you need to assign it using the BindAction function using the UInputComponent of your pawn. It is easiest to do this in the SetupPlayerInputComponent function. You can read more about it here: UInputComponent::BindAction | Unreal Engine Documentation

From,

void AMyPawn::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{

	Super::SetupPlayerInputComponent(PlayerInputComponent);

    PlayerInputComponent->BindAction("NewActionMapping", IE_Pressed, this, &AMyPawn::PrintName);
}
3

Yes, the BindAction function essentially tells the engine to fire a function when a key is pressed. This is because when you use the blueprint node the engine knows what pawn is calling the Action Map and you are writing the logic for what will happen depending on the input. In C++ you have to tell the pawn which function to call when an action map is called using whatever input.

First you need your action map set up in your Project Settings(ProjectSetting->Input). Then you need to use BindFunction. The first argument is the Action Map name, the second is how to read the input (click, double click, release, etc.), the third is what object to call when the key is pressed, and the fourth is what function to call.

Reference for the second input:

282008-action-map.png

4

First of all, Thanks for the help.

Should i Bind an Action even if i’ve already created the action inside the Engine setting?
Isn’t there a way just to check when that action fires like on blueprint when you just input the action name and the blueprint node fires?

5

Thanks a lot for the help. Pretty sure i have all the infos that i need to complete the script. Thanks again