I’ve created a C++ class that inherity from AStaticMeshActor (it’s meant to represent a building within the game world). I’ve created a new blueprint that inherits from this class.
When loading the game (which should be creating instances of the blueprint) I’m not seeing my breakpoint in my C++ constructor being hit.
What I really want is a way for C++ code to be called when creating an instance of the blueprint object. How do I do this?
Dear Neil,
If you review StaticMeshActor.h
you will find that there is a msg that SMA does not call post initialize components
// Copyright 1998-2013 Epic Games, Inc. All Rights Reserved.
#include "StaticMeshActor.generated.h"
/**
* An instance of a StaticMesh in a level
* Note that PostInitializeComponents() is not called for StaticMeshActors
*/
UCLASS(placeable, hidecategories=(Input), ConversionRoot)
class ENGINE_API AStaticMeshActor : public AActor, public INavRelevantActorInterface
{
But you’re saying you have a breakpoint in the actual constructor itself, not postinit ?
I spawn SMA’s quite extensively in my game
Since I do the spawning through code, I can therefore run my own custom Init() function on the new SMA
To spawn a BP, you have to have a BP in your .h file as a UClass that you set in the editor*
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category=BPClasses)
UClass* YourBuildingBP;
and then in the code you do
AStaticMeshActor* NewBuilding = GetWorld()->SpawnActor(YourBuildingBP, etc);
#Where to Spawn From?
I spawn stuff from my player controller class, but you could do it anywhere
and even write a BlueprintCallable function to do all this in a blueprint event graph somewheres
Rama
Right, I saw that.
But I’m trying to do the exact opposite - you’re spawning instances from C++, I want to spawn my C++ object (or at least call a function on construction!) of a BP object.Maybe it can’t be done - but it seems like it should be possible and I’m just missing something!
by the way I tested the above as actually working
please note it is your EventGraph for your BP of your SMA
This was a super-useful hint. Thanks!
Aha! So the trick is to take your C++ function and prepend it with:
UFUNCTION(BlueprintCallable, Category=Building)
Where, in this case, “Building” is the sub-heading that your function will appear under in the Blueprint editor.
For a better example let’s say that I have a function called MyDebugTest(). It might end up looking like this:
UFUNCTION(BlueprintCallable, Category=Building)
void MyDebugTest(FString pString);
Simple once you realize how BlueprintCallable works!
yup!
please click the check mark next to my answer above to indicate your situation is resolved so everyone knows