Accessing C++ 'Native class' and it's variables from a UBlueprint object

[bwbilyeu]

I am trying to check the values of the C++ ‘Native Class’ of a Blueprint object, in C++ code. I am working with a derived EditorValidator_Base class. I want to validate that my blueprinted MyGameplayAbility objects have certain fields set properly (ex: duration = 0 for duration policy of instant, positive magnitude values for healing abilities, etc).

CanValidateAsset_Implementation works as intended as I check for the passed asset’s class to be UBlueprint and that asset’s parent class is equal to MyGameplayAbility.

Within ValidateLoadedAsset_Implementation is where I want to access the values within the MyGameplayAbility class of the asset I am validating, but I cannot find any way to do this.

Is this something where I am missing the forest for the trees or is this actually a problem process?

[MagForceSeven]

Sounds like you want to cast the InAsset parameter to your native type:

UMyGameplayAbility* Ability = Cast<UMyGameplayAbility>(InAsset);

Or am I misunderstanding?

[bwbilyeu]

The object is a UBlueprint of the UMyGameplayAbility class. If I cast directly to UMyGameplayAbility, it fails. While it is possible to use a UGameplayAbility class (or derived class) directly as this asset type, this sacrifices the functionality of blueprints for special abilities and removes the need to manually code every exception.

[Chatouille]

try accessing it via

UBlueprint* Bp = Cast<UBlueprint>(InAsset);
UClass* Class = Bp->GeneratedClass;
UObject* CDO = Class->GetDefaultObject();
UMyGameplayAbility Ability = Cast<UMyGameplayAbility>(CDO);

You might want to validate each step with a check

[bwbilyeu]

That did it and thank you!

EDataValidationResult UEditorValidator_GameplayAbilities::ValidateLoadedAsset_Implementation(UObject* InAsset, TArray<FText>& ValidationErrors)
{
    UBlueprint* InBlueprint = Cast<UBlueprint>(InAsset);
    UMyGameplayAbility* Instance = Cast<UMyGameplayAbility>(InBlueprint->GeneratedClass->GetDefaultObject());

    // validation steps/logic here
}