Get hierarchy departments (OU) and users from Active Directory

AD environment is as follows
-Multi Domain
-Sub Domain

* GUI program *
In the above state, the organizational structure (OU) in each domain should be displayed in a hierarchy, and users belonging to this OU should be acquired.
(The display should be displayed in a tree structure)

* C++ DLL *
Get Current OU/department/User from current AD Session

Development environment: MSVC 2017
Development tool: C#, C++