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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.
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
'
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 'handle to the environment
on error resume next
cboDSNList.AddItem "(None)"
'get the DSNs
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
cboDrivers.AddItem sDRV '---optional - driver
'--- value returned
End If
Loop
End If
'remove the dups
If cboDSNList.ListCount > 0 then
With cboDrivers
If .ListCount > 1 then
i = 0
While i < .ListCount
If .List(i) = .List(i + 1) then
.RemoveItem (i)
else
i = i + 1
End If
Wend
End If
End With
End If
cboDSNList.ListIndex = 0
End Sub
'
