Shooter Game Crouch

Development Programming & Scripting
1

I have added this code to the SetupPlayerInputComponent:

	InputComponent->BindAction("Crouch", IE_Pressed, this, &AShooterCharacter::Crouch);
	InputComponent->BindAction("UnCrouch", IE_Released, this, &AShooterCharacter::UnCrouch);

I’m getting this error and I’m not sure what I should be casting:

error C2664: 'FInputActionBinding &UInputComponent::BindAction<AShooterCharacter>(const FName,const EInputEvent,UserClass *,void (__cdecl AShooterCharacter::* )(void))' : cannot convert argument 4 from 'void (__cdecl ACharacter::* )(bool)' to 'void (__cdecl AShooterCharacter::* )(void)'
1>          with
1>          [
1>              UserClass=AShooterCharacter
1>          ]
1>          Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
2

Can you please post the declaration for AShooterCharacter::Crouch? Is it defined in AShooterCharacter or ACharacter?

3

The reason you’re getting this error (As far as I can tell, from when it happened to me!) is because BindAction is expecting a function that takes no parameters, namely because as far as I’m aware there’s no real way to transmit parameters to a function from just a keypress.

As you can see, Crouch() expects a bool to be passed into it.

So basically you’re telling the game to call Crouch(bool bClientSimulation) whenever a key is pressed, but when that key is pressed the engine doesn’t know what to fill in for bClientSimulation. To get around this, you need a function that doesn’t take any parameters when it is called.

The way I got around this was by creating two functions:

void AShooterCharacter::execOnStartCrouch()
{
	if (CharacterMovement)
	{
		if (CanCrouch())
		{
			CharacterMovement->bWantsToCrouch = true;
		}
	}
}

void AShooterCharacter::execOnEndCrouch()
{
	if (CharacterMovement)
	{
		CharacterMovement->bWantsToCrouch = false;
	}
}

Then binding to THOSE functions. That way the functions can be properly bound, and by simply setting bWantsToCrouch on the CharacterMovementComponent, the engine will handle crouching for me.

4

Quick note, if I remember properly, crouching is still disabled in the CanEverCrouch() function of the MovementComponent. You’ll have to override that to enable crouching still, I think. If you can’t figure it out just post and I’ll take a look at my source and help you out.

5

Kopirat, I’m having an issue crouching as well in c++. I’m assuming it’s because the issue you stated above. How do I disable the CanEverCrouch() in c++?
Thanks,

6

Go into your movement component class and override CanEverCrouch to return true and you should be all set!

7

I’m still a little confused about this. I went into the MovementComponent.h, but I don’t see CanEverCrouch. Do I need to add something like:
virtual bool CanEverCrouch() OVERRIDE;?
Sorry I’m new to overriding. Trying to read up on it now.

Edit: I’m doing the first person shooter tutorial as well so I don’t have the fps template. (Thought I should mention this)

Edit 2: Looking through the code it looks like

 FORCEINLINE bool CanEverCrouch() const { return NavAgentProps.bCanCrouch; }

but I’m unable to override canevercrouch from my fpscharacter.h, (because it’s not in the base class I assume?).

8

The Easy part is on PlayerPawn in the Editor and under Defaults->Movement Component->Nav Agent Props" Check “Can Crouch” This will allow you to turn it on, now, you’ll have to create your own animations,etc once this is done.