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codice:
Option Explicit


Private Declare Function lstrlenW Lib "kernel32" (ByVal lpString As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Private Declare Function NetGetDCName Lib "Netapi32.dll" (strServer As Any, strDomain As Any, bufptr As Long) As Long
Private Declare Function NetApiBufferFree Lib "Netapi32.dll" (ByVal lpBuffer As Long) As Long
Private Sub Command1_Click()
    Dim l As Long
    Dim dc() As Byte
    Dim bufptr As Long
    l = NetGetDCName(ByVal 0&, _
        ByVal 0&, _
        bufptr)
    MsgBox Pointer2stringw(bufptr)
    NetApiBufferFree bufptr
End Sub

Private Function Pointer2stringw(ByVal l As Long) As String
    Dim buffer() As Byte
    Dim nLen As Long
    nLen = lstrlenW(l) * 2
    If nLen Then
        ReDim buffer(0 To (nLen - 1)) As Byte
        CopyMemory buffer(0), ByVal l, nLen
        Pointer2stringw = buffer
    End If
End Function