UEnum : how to query the FString value at index?

Development Programming & Scripting
1

Hi,
I’m currently learning how to use UEnum and so I followed Rama’s example:

UENUM(BlueprintType)		//"BlueprintType" is essential to include
enum class EVictoryEnum : uint8
{
        VE_Dance 	UMETA(DisplayName="Dance"),
        VE_Rain 	UMETA(DisplayName="Rain"),
	VE_Song	UMETA(DisplayName="Song")
};
 
UCLASS()
class YourClass : public YourSuperClass
{
	GENERATED_UCLASS_BODY()
 
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Enum)
	EVictoryEnum VictoryEnum;
 
	//Rest of Class Code
};

I’m currently investigating how I would get the FString at index[i] and again using Rama’s example:

FString GetVictoryEnumAsString(EVictoryEnum::Type EnumValue)
{
  const UEnum* EnumPtr = FindObject<UEnum>(ANY_PACKAGE, TEXT("EVictoryEnum"), true);
  if(!EnumPtr) return FString("Invalid");
 
  return EnumPtr->GetEnumName(EnumValue); // for EnumValue == VE_Dance returns "VE_Dance"
}

I assumed the EVictoryEnum::Type EnumValue was where I would pass in a uint8 to check the index, but my compiler won’t have any of it, saying that ‘EVictoryEnum’ has no member type ‘EnumValue’ which I understand, but why is the example written this way?? Is there something interesting going on in the method definition in the .h file I’m missing?

2

Hello,

From the way method is declared, I assume it is supposed to be used with old enums. For example, the old-style declaration for described enum would look like this:

UENUM(BlueprintType)
namespace EVictoryEnum 
{
	enum Type 
	{
		VE_Dance   UMETA(DisplayName = "Dance"),
		VE_Rain    UMETA(DisplayName = "Rain"),
		VE_Song    UMETA(DisplayName = "Song")
	};
}

In the declaration you would need to use TEnumAsByte:

UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Enum)
TEnumAsByte<EVictoryEnum::Type> VictoryEnum;

However, to get the method work with the new-style enum that is provided in the tutorial, you can replace EVictoryEnum::Type EnumValue in the argument list with uint8 EnumValue:

FString GetVictoryEnumAsString(uint8 EnumValue)

If you like to learn more about enums in Unreal Engine 4, please go here:

Hope this helped!
Cheers!

3

Ahhh I am going to try this, but that makes sense. I had a feeling it may have been for an older style enum. Thanks for the info and the doc link!

4

@.Bulgakov : I tried this implementation, so in blah.h I have:

    //header stuff
    UENUM( )
    enum class ETaxiMoveModeEnum : uint8
    {
    	TX_PerchedIdle 	UMETA( DisplayName = 'Perched - Idle' ) ,
    	TX_Flapping 	UMETA( DisplayName = 'Flapping' ) ,
    	TX_Diving		UMETA( DisplayName = 'Diving' ) ,
    	TX_Gliding		UMETA( DisplayName = 'Gliding' )
    };
    //...
    UCLASS(Blueprintable)
    class AtwinStickPawn : public APawn
    {
    	GENERATED_BODY()
    
    	UPROPERTY()
    	ETaxiMoveModeEnum ETaxiMovementModeObj; 
    //... etc etc

and then in the blah.cpp I am trying to access the enum values via:
AtwinStickPawn::AtwinStickPawn(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{ 
//...
ETaxiMoveModeObj::TX_Flapping

but I get an error saying:
ETaxiMoveModeObj is not a namespace or class. Which I guess is pretty obvious looking at it. So just how am I to access this enum data?