How to recursively iterate the USTRUCT?

Development Programming & Scripting
1

I want to get tree of USTRUCT object. This is reasonable to parse\save JSON objects.

I know, there are this (StaticStruct) method, but I don’t know anything about this:

	UScriptStruct* test = FMyStructType::StaticStruct();

Maybe it helps me, but I need to learn opinion of staff.
I also need to get\set values in from tree.

2

Use the methods in

and

to navigate the members.

3

Stop! But how can I iterate by the VALUES in tree?

4

You want to iterate over the members of a ustruct and extract the value of each member, correct?

You want to use FYourStruct::StaticClass() as the base. The first child property is the Children property of that struct. That’s a linked list of children, to the second property is Children->Next. The third is Children->Next->Next. Etc.

You want to cast these children to a UProperty object, see this:

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

It will be one of those 4 subclasses listed at the top. You then use one of the GetXPropertyValue( obj ) methods to get the value. E.g.

int IntValue = SomeIntegerProperty->GetIntegerPropertyValue( MyStructObject );

If you find a struct or class propery value, start a new tree.

Don’t forget they could be arrays.

5

The fields of struct is static. I can’t iterate by the fields like a dict in Python.
And while iterating, code don’t know anything about types. Casting void to specified “FStructType” is not good idea.

6

I’ll try this! Thanks for clarifying. I’ll let you know about the result :slight_smile:
And how to identify type of property?

7

FYourStruct::StaticClass() should be FYourStruct::StaticStruct()