sephirot47

- GameMode, make sure none of them is null
- Null pointer exceptions
- Having instantiated in the level the same PlayerBP than the one in GameMode 
  (so when the game starts the GameMode puts another one and it gets duplicated ) 
  
- Having BAD CODE(code that can cause a crash), even on startup. Ye, if u have bad code it can crash on startup!!! UE4 does some sort of prebuild or something. Beware of putting code on the constructor that must go in the BeginPlay instead, this happened to me <3

sephirot47

UComponentType *myComponent;
TArray<UComponentType*> comps;
actor->GetComponents(comps);
if (comps.Num() > 0) myComponent = comps[0];

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//For every actor in this level...
for (TActorIterator<AActor> actor(GetWorld()); actor; ++actor)
{
  //Do whatever you want with your actor
  actor->BlahBlah();
}

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                               //Input name        //Function to handle the input
this->InputComponent->BindAxis("MoveForward", this, &UMyActor::HandleVerticalAxis);

void UMyActor::HandleVerticalAxis(float v)
{
  //v is the float value for the input
}

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//Supose we are inside a Component                                 ACTOR OF THE COMP.
AREMHUD *hud = Cast<AREMHUD>(UGameplayStatics::GetPlayerController( this->GetOwner(),     0)->GetHUD());

//Custom HUD class: AREMHUD

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//Pars: id, seconds, color, text

GEngine->AddOnScreenDebugMessage(0, 1, FColor::Red, TEXT("HI"));
GEngine->AddOnScreenDebugMessage(76867, 3, FColor::MakeRandomColor(), FString::FromInt(8572));
GEngine->AddOnScreenDebugMessage(76867, 5, FColor::MakeRandomColor(), FString::SanitizeFloat(3.141592f));

sephirot47

//En el constructor (no el BeginPlay)

UTexture2D *texture;
static ConstructorHelpers::FObjectFinder<UTexture2D> Texture(TEXT("/Game/StarterContent/Textures/T_Spark_Core.T_Spark_Core"));
texture = Texture.Object;

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UGameplayStatics::GetPlayerController(actor, 0)

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//From the actor's viewport (camera)
FVector2D result;
UGameplayStatics::GetPlayerController(actor, 0)->ProjectWorldLocationToScreen(pointInWorld, result);
//result now has the screen point(x,y)

sephirot47

character->InputComponent->BindAction("Jump", IE_Pressed, this, &AMyCharacter::HandleJump);
character->InputComponent->BindAction("Jump", IE_Released, this, &AMyCharacter::HandleJump);