How to get C++ class name of object?

Development Programming & Scripting
1

There is some property (UPROPERTY) in some object.
Type of this property named USomeCppType
But in the Blueprint, type of this property overriden as SomeBlueprintType (derived from USomeCppType).

And now I want to know what name of CPP-ancestor of this object?

Code:

// definition code of property
public:
    UPROPERTY()
    UMinimap* Minimap;

In some virtual UMinimap method (called from Blueprint):

// the object want to know his C++ type name
this->GetMyCPPType();  // Should return the "UMinimap" string

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Are there ways to got this type name string?

P.S. “UProperty” type has method GetCPPType, but this can be used only with TFieldIterator (another case)

2

To get the FName this should do the trick:

this->GetClass()->GetFName();

If you need a FString instead:

this->GetClass()->GetName();

If the final instance might inherit from UMinimap it will return the leaf name.

As @anonymous_user_f5a50610 said you can actually get the native class names, so it really depends on your situation. Using the class name will be a bit less flexible against adding a method that returns the name you want (an FName), so it would be solving your case only with pure inheritance and manual setup or with reflection and done all automatically.

1 Like
3

Method of Blueprint type inherited from UMinimap will return his name (not UMinimap). I need get the C++ ancestor name (UMinimap).

71814-screen.png

4

Yes as I said it will give you the leave type, may I ask a few questipns?

  • Could you provide a use case?
  • What if UMiniMap has another child in Child in C++, what oitput do you need?

Once I’m back on my machine I can post some examples.

5
  • Manager of widgets. Every widget in this manager can be created only once and only by this manager (like a singletons). And all this widgets can be refer to this manager. And can also find himself in. The case: invalidation on specified widget. I call method Invalidate on widget, and widget sets self to nullptr on the Manager using reflection (TFieldIterator). How to found self in manager? Using C++ ancestor typename for example (the blueprint widget is inherited from C++ widget).
  • No other childs… But this is interesting too. The parent tree of clasees.
6

You got GetPrefixCPP() you can add it to prefixless name

You can also get UProperty from here:

To get parent (which sometimes is called Super) UClass use this function:

In reflection system UClass is extantion of UStruct

1 Like
7

Ok so it I understand it correctly you need a string that matches exactly the name of the last native class of a given hirachy and the whole hirachy is inheriting from a common native class let’s say UBaseWidget?

In that case I would just add a virtual function to `UBaseWidget`` that returns the string of the last native class, the function could be a BlueprintCallable so you can not re-implement it in BP.

8

I may be a bit late, I got into the same problem that you, I needed to get the name of the CPP class from a Blueprint call. The accepted answer doesn’t really solve the problem, so here you are, an easy and clean solution:

If you want to get the CPP class, you can just use StaticClass()

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I hope this helps in the future to people that get into the same problem.

1 Like
9

Chiming in on this even further in the future. This answer is only sort of correct. StaticClass is not a virtual function and so will give you the class of the pointer type you are using. Using the example above (ignore the fact that these would be null/uninitialized):

URollLocalizationBank* Bank;
Bank->StaticClass();

In that case, it would return the class for URollLocalizationBank.

URollLocalizationBank* Bank;
UObject* BankObj = Bank;
BankObj ->StaticClass();

In this case, it would return UObject since that’s the type of the pointer being accessed.