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Generically list Properties of a UObject

Hi, I am looking for a way to generically list the members (UProperties if needed) of a class. I know I can access them by name with FindPropertyByName, which I think is super usefull. Now I am looking for a way to get the names of the members generically.

I would for example have a TArray with instances of a baseclass in it. I would then iterate over the instances and ask for members of the subclasses. I know that I could achive that with a virutal method (and GetNativePropertyValues is kind of that), I just want to know if there already is something I could use. GetNativePropertyValues kind of fits, but it does more then I want and I'd need to implement that for each subclass, which would be nice to avoid. Although of course not a real problem if I have to. Building on that, I would also like to filter the Properties based on a UProperty modifier.

Greetings, Simon

Product Version: UE 4.13
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asked Nov 28 '16 at 05:39 PM in C++ Programming

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pulp_user
1.2k 46 29 58

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1 answer: sort voted first

You can grab and even filter UProperties of a class using TFieldIterator. UField is most lowest reflection system class, which included UFunction, UProperty, UClass etc so you can use it not just for properties but also functions

https://docs.unrealengine.com/latest/INT/API/Runtime/CoreUObject/UObject/TFieldIterator/index.html

You can use it like this:

 for (TFieldIterator<UProperty> It(UClassPointerOfClassYouWantPropertiesToBeListed); It; ++It) {
      SomeArray->Add(*It)
 }

You don't need to make array you can do somethng with properties stright away

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answered Nov 28 '16 at 06:00 PM

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Shadowriver
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avatar image pulp_user Nov 28 '16 at 06:25 PM

Perfect Answer! Works flawlessly! I did the further filtering like this:

UPROPERTY(EditAnywhere, BlueprintReadWrite, Meta = (ExposeOnSpawn, TEST))

if (it2->HasMetaData("TEST"))

It really is a joy to programm when everything works as expected (except that dereferencing operator doing type conversion catches me offguard every time :D). Thank you so much!!

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