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FObjectFinder vs LoadObject

Let's collect the differences between the two methods, as they don't seem to be mentioned anywhere else.

  1. FObjectFinder is used in constructor, while LoadObject is used anywhere

  2. Syntax difference:

    UMaterial* material_var = LoadObject<UMaterial>(nullptr,TEXT("Material'/Game/...'"));
    static ConstructorHelpers::FObjectFinder<UMaterial> material_wrapped(TEXT("Material'/Game/...'"));
    UMaterial* material_var = material_wrapped.Object;
  3. FObjectFinder creates a static var in C++ constructor which wastes sizeof(*ptr) of RAM per class for each time you use that method

I will add more differences as i discover them either myself or hear them here.
one particularly interesting is how slower is LoadObject compared to FObjectFinder?

Product Version: UE 4.19
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asked Mar 18 '18 at 10:36 PM in C++ Programming

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avatar image EvangelionZero May 23 '19 at 10:55 AM

Thank you so much

avatar image Arty-McLabin May 24 '19 at 12:20 PM

no problem mate, enjoy

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1 answer: sort voted first

I get an access violation error when using the FObjectFinder in the constructor of one class. Have you got any idea what the reason for that might be? The line is

 auto psAsset = ConstructorHelpers::FObjectFinder<UParticleSystem>(TEXT("ParticleSystem'/Game/ParticleSystems/PS_CompoundCloud_SingleCelled.PS_CompoundCloud_SingleCelled'"));

Thanks for the help.

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answered Jun 26 '18 at 10:28 AM

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avatar image Arty-McLabin Jun 29 '18 at 08:01 PM

are you getting the error when trying to reference psAsset later in code, or in this very line?

avatar image GameAboutThings Jun 29 '18 at 08:03 PM

In that exact line and if I try FObjectFinderOptional I get it on Succeeded() and Get()

avatar image Arty-McLabin Jun 29 '18 at 08:07 PM

sadly i don't have a clue on what could cause it. the only thing i would suggest is double checking you call it in the classic C++ MyClass() constructor, rather than OnConstruction()

otherwise i would submit a separate question here in AnswerHub

avatar image GameAboutThings Jun 29 '18 at 08:12 PM

I tried it in different constructors, in different classes. For some reason it only happens with particle systems. And I already posted a question two days ago and so far haven't got any answers so I thougt I might look around.

avatar image Arty-McLabin Jun 29 '18 at 08:39 PM

just keep bumping the question every 4-7 days. eventually you will get an answer. just please don't bump too much because it would be selfish :]

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