Registering a key press, using C++

Development Programming & Scripting
1

Hi,

I am currently trying to make a simple program, where everything is done within C++; that’s why I am avoiding using the input options within the editor. The problems that I’m having however are:

  • What parent class should I be choosing to create a C++ program that allows for a model to be loaded and changed through input from the keyboard?

  • If I can use a “World Settings” parent class, what is the reason for the following code not working as expected?

Here is the .h file currently, the code to load a model is the same from the previous version that worked with an Actor parent class:

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

#pragma once

#include "GameFramework/WorldSettings.h"
#include "Input.generated.h"

/**
 * 
 */
UCLASS()
class KEYPRESSING_API AInput : public AWorldSettings
{
	GENERATED_BODY()

public:
	AInput();
	~AInput();
	void SetupInput();
	void Released_One();
	void Released_Two();
	void Released_Three();

	//Changed to a UBoxComponent
	UPROPERTY(EditAnywhere)
		UBoxComponent* Root;
	UPROPERTY(EditAnywhere)
		UStaticMeshComponent*  mesh;
	UPROPERTY(EditAnywhere)
		UStaticMesh*  model1; 
	UPROPERTY(EditAnywhere)
	UStaticMesh* model2;
	UPROPERTY(EditAnywhere)
	UStaticMesh* model3;

	
};

The .cpp file currently:

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

#include "KeyPressing.h"
#include "Input.h"

AInput::AInput()
{
	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;
	//Created box component and setting it as the root component
	Root = CreateDefaultSubobject<UBoxComponent>(TEXT("Root"));
	RootComponent = Root;

	//Creating the mesh component and attaching it to the root component
	mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("mesh"));
	mesh->AttachTo(RootComponent);
	//Grabbing the mesh I'd like to use
	static ConstructorHelpers::FObjectFinder<UStaticMesh> Mesh1(TEXT("/Game/Models/model1"));
	static ConstructorHelpers::FObjectFinder<UStaticMesh> Mesh2(TEXT("/Game/Models/model2"));
	static ConstructorHelpers::FObjectFinder<UStaticMesh> Mesh3(TEXT("/Game/Models/model3"));
	//Setting the mesh
	model1 = Mesh1.Object;
	model2 = Mesh2.Object;
	model3 = Mesh3.Object;
	mesh->SetStaticMesh(model1);
}
AInput::~AInput()
{
}
void AInput::SetupInput()
{
	InputComponent->BindKey(EKeys::One, IE_Released, this, &AInput::Released_One);
	InputComponent->BindKey(EKeys::Two, IE_Released, this, &AInput::Released_Two);
	InputComponent->BindKey(EKeys::Three, IE_Released, this, &AInput::Released_Three);
}
void AInput::Released_One()
{
	GEngine->AddOnScreenDebugMessage(-1, 4, FColor::Blue, TEXT("Pressed 1"));
	mesh->SetStaticMesh(model1);
}
void AInput::Released_Two()
{
	GEngine->AddOnScreenDebugMessage(-1, 4, FColor::Blue, TEXT("Pressed 2"));
	mesh->SetStaticMesh(model2);
}

void AInput::Released_Three()
{
	GEngine->AddOnScreenDebugMessage(-1, 4, FColor::Blue, TEXT("Pressed 3"));
	mesh->SetStaticMesh(model3);
}

Any help would be appreciated, thank you.

Edit: I changed the title, so that it was a more open question.

2

I don’t see where your setupinput() is being called? Shouldn’t it be called from the constructor?

3

Hi, thanks for replying.

I eventually managed to get this working, it was as you mentioned with regards to the setupInput() not being called.

Thank you for taking the time to reply.