WIN32OLE_RECORD

WIN32OLE_RECORD objects represents VT_RECORD OLE variant. Win32OLE returns WIN32OLE_RECORD object if the result value of invoking OLE methods.

If COM server in VB.NET ComServer project is the following:

Imports System.Runtime.InteropServices
Public Class ComClass
    Public Structure Book
        <MarshalAs(UnmanagedType.BStr)> _
        Public title As String
        Public cost As Integer
    End Structure
    Public Function getBook() As Book
        Dim book As New Book
        book.title = "The Ruby Book"
        book.cost = 20
        Return book
    End Function
End Class

then, you can retrieve getBook return value from the following Ruby script:

require 'win32ole'
obj = WIN32OLE.new('ComServer.ComClass')
book = obj.getBook
book.class # => WIN32OLE_RECORD
book.title # => "The Ruby Book"
book.cost  # => 20