Truco de Visual Basic 6.0 - Abrir/Cerrar lector de CD

Private Declare Function mciSendString Lib "winmm.dll" Alias "mciSendStringA" (ByVal lpstrCommand As String, ByVal lpstrReturnString As String, ByVal uReturnLength As Long, ByVal hwndCallback As Long) As Long
'Abre/Cierra la bandeja de CD.
'Si ST = FALSE, cierra la bandeja.
'Si ST = TRUE, abre la bandeja.
Sub OpenCD(ByVal St As Boolean)
Dim Ret As Integer, ReturnString As String, Aux As String
If St Then
Aux = "open"
Else
Aux = "closed"
End If
Ret = mciSendString("set CDAudio door " + Aux, ReturnString, 127, 0)
End Sub