Public Declare Function CloseHandle Lib "kernel32" ( _
     ByVal hObject As Long) As Long
    
Public Declare Function DeviceIoControl Lib "kernel32" ( _
     ByVal hDevice As Long, _
     ByVal dwIoControlCode As Long, _
     lpInBuffer As Any, _
     ByVal nInBufferSize As Long, _
     lpOutBuffer As Any, _
     ByVal nOutBufferSize As Long, _
     lpBytesReturned As Long, _
     lpOverlapped As OVERLAPPED) As Long
    
Public Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" ( _
     ByVal lpFileName As String, _
     ByVal dwDesiredAccess As Long, _
     ByVal dwShareMode As Long, _
     lpSecurityAttributes As SECURITY_ATTRIBUTES, _
     ByVal dwCreationDisposition As Long, _
     ByVal dwFlagsAndAttributes As Long, _
     ByVal hTemplateFile As Long) As Long

' WINAPI - Typen
Public Type USBName
    USBLenght As Long
    GUID(256) As Byte
End Type

Public Type OVERLAPPED
    ternal As Long
    ternalHigh As Long
    offset As Long
    OffsetHigh As Long
    hEvent As Long
End Type

Public Type SECURITY_ATTRIBUTES
    nLength As Long
    lpSecurityDescriptor As Long
    bInheritHandle As Long
End Type

' WINAPI - Valores de las constantes
Public Const OPEN_EXISTING = 3
Public Const GENERIC_READ = &H80000000
Public Const GENERIC_WRITE = &H40000000
Public Const FILE_SHARE_READ = &H1
Public Const FILE_SHARE_WRITE = &H2

Private Const USB_ROOT_HUB = &H220408
Private Const USB_HOSTCONTROLLER = &H220424

Private Sub Form_Load()
    Dim hFile     As Long
    Dim sHostName As String
    Dim Sa        As SECURITY_ATTRIBUTES
    Dim ov        As OVERLAPPED
    Dim i         As Long
    Dim ii        As Long
    Dim nFlags    As Long
    Dim nShare    As Long
    Dim USB       As USBName
    Dim RetByte   As Long
    Dim rVal      As Long
    
    nFlags = GENERIC_READ Or GENERIC_WRITE
    nShare = FILE_SHARE_READ Or FILE_SHARE_WRITE
    
    For i = 0 To 3
       sHostName = "\\.\HCD" & CStr(i)
       hFile = CreateFile(sHostName, nFlags, nShare, Sa, OPEN_EXISTING, 0, 0)
       If hFile > 0 Then
           sHostName = ""
           If DeviceIoControl(hFile, USB_ROOT_HUB, 0, 0, USB, Len(USB), RetByte, ov) Then
               rVal = DeviceIoControl(hFile, USB_ROOT_HUB, USB, USB.USBLenght, USB, USB.USBLenght, RetByte, ov)
               If rVal Then
                  For ii = 0 To RetByte Step 2
                     sHostName = sHostName + Chr(USB.GUID(ii))
                  Next
                  MsgBox sHostName
               End If
           End If
           CloseHandle hFile
       End If
    Next
End Sub