Cannot see Blueprintcallable Function in Editor

Development Programming & Scripting Blueprint
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1

Hello,

I just started out with the engine and got a (small) problem with calling C++ Functions from Blueprint.

In my .h File i have:

UFUNCTION(BlueprintCallable, BlueprintPure, Category = "Hexgrid")
TArray<FVector> GenerateGrid();

and in my .cpp:

 TArray<FVector> AHexGrid::GenerateGrid(){...}

When i create a class Blueprint i dont find a way to call the function, it doesnt show in the function section when i edit the Graph. Maybe there is another spot where i have to look ? (I want to call the function in the construction script to calculate the positions of new objects and return these in a Array - so i can do the actual spawning in Blueprint)

Thanks for your time.

2

Because you have BlueprintPure on it.
If you want to use the BlueprintPure you must change to:

void GenereateGrid(TArray<FVector>& Out)
3

Thanks for you answer! I changed the signature like you suggested, but i still cannot find the function in the editor. It doesnt show when i try to type the name in the “All possible actions” Box that comes up when rightclicking in the EventGraph or ConstructionScript Window. Also it is not on the left hand side under functions or variables. The Blueprint was created as a Class Blueprint so technically it should have access to its parent class AHexGrid’s functions right ?

4

Yeah you should have access and that should work, do your other function without return Tarray work ?

5

I tried now to create a new project, then add a new c++ class with various functions that return something or dont and have parameter or not. (All have BlueprintCallable and a Category) None of them show in the Blueprint Graph when i create a Class Blueprint. Variables do show if I check “Show Inherited Variables” but Functions are nowhere to be found. (There is no “Show Ihnherited Functions”. I would love an example how to do it right, i cant seem to figure it out.

6

can you send me that new script u just make in new project, i can have a look at that.

7

UCLASS(Blueprintable)
class ASGARD_API AHexGrid : public AActor
{
GENERATED_UCLASS_BODY()

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Hexgrid)
	uint8 GridWidth;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Hexgrid)
	uint8 GridHeight;
	
	UPROPERTY(VisibleDefaultsOnly, BlueprintReadOnly, Category = Hexgrid)
	TSubobjectPtr<USceneComponent> SceneComponent;

	UPROPERTY(VisibleDefaultsOnly, BlueprintReadOnly, Category = Hexgrid)
	TSubobjectPtr<UStaticMeshComponent> HexMeshComponent;

	UFUNCTION(BlueprintCallable, BlueprintPure, Category = Hexgrid)
	void GenerateGrid(TArray<FVector>& Out);

	UFUNCTION(BlueprintPure, meta = (FriendlyName = "Adds floats", CompactNodeTitle = "Add Floats", Keywords = "Float Add"), Category = Game)
	static float AddFloats(float fA, float fB);
};

This is the header file. Even the AddFloats Function doesnt show (taken from unrealengine wiki).

8

It worked when i created a new project. Somehow i guess the projectfiles were broken.

  1. Add code to project in the editor to create new class

  2. Add function to class (like below)

  3. Rightclick into EventGraph and type the functions name (uncheck context sensitive before)

    UFUNCTION(BlueprintCallable, Category = “Hexgrid”)
    void GenerateGrid(TArray& Out);

9

did you ever figure it out?

10

it’s completely not true.

here is a BlueprintPure that works completely fine for me both in C++ and BP:

UFUNCTION(BlueprintCallable, BlueprintPure)		
	float getRecoilCompensation();
11

I had the same issue, and resolved it by:

  • Go to your project root directory and delete Saved, Intermediate and Binary directories with its content in the project directory
  • Right click on the [your-project-name].uproject and then generate visual studio project files (this will bring back the folders we removed)
  • Launch the project, if it prompts to rebuild it, go for it and select YES, and once UE opened, I was able to find the blueprint callable
1 Like
12

THANK YOU