Get Dsn And Driver (Api)

This code shows how to list the available DSN and Drivers installed on the
computer.
The program works by utilizing the SQLDataSources API of the ODBC32.DLL.

'[DECLARATION]
Declare Function SQLDataSources Lib "ODBC32.DLL" (Byval henv&, Byval
fDirection%, Byval szDSN$, Byval cbDSNMax%, pcbDSN%, Byval szDescription$,
Byval cbDescriptionMax%, pcbDescription%) As Integer
Declare Function SQLAllocEnv% Lib "ODBC32.DLL" (env&)
Const SQL_SUCCESS = 0
Const SQL_FETCH_NEXT = 1

Sub Click(Source As Button)
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

Msgbox "DSN: " & sDSN & " DRIVER: " & sDRV

End If
Loop
End If

This was first published in November 2000

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