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How do I spawn Blueprints?

I would like to know how to make this work.

  ConstructorHelpers::FObjectFinder<UClass> BlueprintObject(L"Blueprint'/Game/Blueprints/Blueprint_Effect_Explosion.Blueprint_Effect_Explosion'");            
     FActorSpawnParameters SpawnParams;
     SpawnParams.Instigator = Cast<APawn>(Owner);
     SpawnParams.bNoFail = true;
     GWorld->SpawnActor<UBlueprint>(BlueprintObject.Object, GetActorLocation(), FRotator(0, 0, 0), SpawnParams);

 UObjectGlobals.cpp(2204): Fatal error:
 FObjectFinders can't be used outside of constructors to find Blueprint'/Game/Blueprints/Blueprint_Effect_Explosion.Blueprint_Effect_Explosion'
 UE4Editor.exe has triggered a breakpoint.

I would like to know how to make this work. The reference to the blueprint is correct. I have checked.

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asked May 23 '14 at 10:10 PM in C++ Programming

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Skydive
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Spawning Blueprints

I gave the world my SpawnBP template function to make doing this easy

Wiki Tutorial

https://wiki.unrealengine.com/Templates_in_C%2B%2B#Spawn_Actor_From_Blueprint

Rama

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answered May 24 '14 at 03:28 AM

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Rama
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avatar image Skydive May 24 '14 at 04:20 PM

Ugh, please may I have an example of how to load the blueprints UClass* and call the function using that. Sorry. :/

avatar image Kochab May 26 '14 at 11:06 PM

Hi, Rama. I'm wondering how you get the actor blueprint. Are you doing it like this?:

  ConstructorHelpers::FObjectFinder<UBlueprint> BlueprintObj(TEXT("Blueprint'/Game/Blueprints/BP.BP'"));
  BPptr = NULL; /*UBlueprint* BPptr;*/
  if (BlueprintObj.Succeeded())
       BPptr = BlueprintObj.Object;

And then you'd pass in BPptr to this?:

  AActorBaseClass* NewActor = UFunctionLibrary::SpawnBP<AActorBaseClass>(GetWorld(), TheActorBluePrint, SpawnLoc, SpawnRot);
avatar image Skydive May 28 '14 at 08:59 AM

does it work?

avatar image DoctorPC Aug 26 '14 at 04:00 PM

What was left unclear to me is, where exactly do I put the function in? It syas I should put it in the .h file of the tepmlate, but in what kind of .h file do I put it in (actor, pawn, etc.) Thanks!

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