El codigo que te adjunto, lo debes poner completo en un form:
Para ello, agrega un combobox y ponle de nombre cboDSNList y te entregara todos los DNS de tu equipo.
Solo tienes que agregar el codigo que requieras para buscar un DNS en particular, eso es pega facil, espero te sirva.
Option Explicit
Private Declare Function SQLDataSources Lib "ODBC32.DLL" (ByVal henv&, ByVal fDirection%, ByVal szDSN$, ByVal cbDSNMax%, pcbDSN%, ByVal szDescription$, ByVal cbDescriptionMax%, pcbDescription%) As Integer
Private Declare Function SQLAllocEnv% Lib "ODBC32.DLL" (env&)
Const SQL_SUCCESS As Long = 0
Const SQL_FETCH_NEXT As Long = 1
Private Sub Form_Load()
GetDSNsAndDrivers
End Sub
Sub GetDSNsAndDrivers()
Dim i As Integer
Dim sDSNItem As String * 1024
Dim sDRVItem As String * 1024
Dim sDSN As String
Dim sDRV As String
Dim iDSNLen As Integer
Dim iDRVLen As Integer
Dim lHenv As Long
On Error Resume Next
If SQLAllocEnv(lHenv) <> -1 Then
Do Until i <> SQL_SUCCESS
sDSNItem = Space$(1024)
sDRVItem = Space$(1024)
i = SQLDataSources(lHenv, SQL_FETCH_NEXT, sDSNItem, 1024, iDSNLen, sDRVItem, 1024, iDRVLen)
sDSN = Left$(sDSNItem, iDSNLen)
sDRV = Left$(sDRVItem, iDRVLen)
If sDSN <> Space(iDSNLen) Then
cboDSNList.AddItem sDSN
End If
Loop
End If
End Sub
