How to call a c++ function in a Blueprint, using as parameter exposed variable

Development Programming & Scripting
1

Hi.

In my c++ class, I have written this simple function:

TArray ABuilder::CreaGliglia(int32 MaxRighe, int32 MaxColonne, float MaxDistanzaTraRighe, float MaxDistanzaTraColonne)
{

TArray<FVector> Array;
FVector Posizione;
USceneComponent* Scene = GetRootComponent();

if (Scene)
	{
	float Xpos = Scene->GetComponentLocation().X;
	float Ypos = Scene->GetComponentLocation().Y;

	for (int32 i = 0; i != MaxRighe; i++)
	{
		float X = i * MaxDistanzaTraRighe;

		for (int32 a = 0; a != MaxColonne; a++)
		{
			float Y = a * MaxDistanzaTraColonne;
			Posizione.Set(Xpos + X, Y + Ypos, 0.f);
			Array.Add(Posizione);
		}
	}
}
return Array;

}

The function works.

Then I have created a second function which i want to call In Blueprint exposed like this:

UFUNCTION(BlueprintCallable, Category = “Builder Function”)
TArray CreaGligliaInBp();

And in cpp it looks like this:

TArray ABuilder::CreaGligliaInBp()
{
TArray Matrix = CreaGliglia(GetRighe(), GetColonne(), GetDistanzaTraRighe(), GetDistanzaTraColonne() );

return TArray<FVector>();

}

where GetRighe(), GetColonne() (Basically getrows() and getColumn() and so on) are just getter methods (or function): they returns the value of the variable passed as parameter to the function.

Righe (rows) and Colonne (column) are exposed like this:

UPROPERTY(EditAnywhere, Category = “Construction”)
int32 Righe;

/*numero di colonne*/
UPROPERTY(EditAnywhere, Category = "Construction")
	int32 Colonne;

Now, if I call the function named CreaGligliaInBp() and tie the (returned) array in a lenght node and print string I get 0 value: even if I change the values of righe (ows) and colonne (column)

Basically here lies the mistake, in the second funcion:

TArray Matrix = CreaGliglia(GetRighe(), GetColonne(), GetDistanzaTraRighe(), GetDistanzaTraColonne() );

the getter methods doesn’t return the variable’s value exposed in Bp.

So the question is: How can I call a function in C++ using the variable exposed in bp?

I know I could override the function in the Bp child and if I use the getter method the trick works.

But I am interested in learning how I can run a c++ function whose variables are esposed in Bp.

Thanks in advance