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System DSNs

Posted on 2000-01-14
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Last Modified: 2012-05-04
How can I get a list of the current System DSNs from visual basic?

Thanks in advance.
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Question by:rj_b
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Accepted Solution

by:
Gogman earned 240 total points
ID: 2354536
Create a Form with a ListBox on it.

Paste this code into the form and run.

---- Start Code ----

Option Explicit

Const SQL_SUCCESS As Long = 0
Const SQL_FETCH_NEXT As Long = 1

Private Declare Function SQLAllocEnv% Lib "ODBC32.DLL" (env&)
Private Declare Function SQLDataSources Lib "ODBC32.DLL" (ByVal henv&, ByVal fDirection%, ByVal szDSN$, ByVal cbDSNMax%, pcbDSN%, ByVal szDescription$, ByVal cbDescriptionMax%, pcbDescription%) As Integer
Private Sub Form_Load()

    On Local Error Resume Next

    Dim i As Integer
    Dim lHenv As Long
    Dim sDSN As String
    Dim sDRV As String
    Dim iDSNLen As Integer
    Dim iDRVLen As Integer
    Dim sDSNItem As String * 1024
    Dim sDRVItem As String * 1024

    ' list drivers
    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

                List1.AddItem "DSN...: " & sDSN & " - Driver: " & sDRV

            End If

        Loop

    End If

    'remove duplicates
    If List1.ListCount > 0 Then

        With List1

            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

    List1.ListIndex = 0

End Sub

---- End Code ----

Enjoy!

gogman
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Author Comment

by:rj_b
ID: 2354684
Is there a way to make it so it just gives me system DSNs rather than both system and file DSNs?
0
 

Author Comment

by:rj_b
ID: 2354698
Is there a way to make it so it just gives me system DSNs rather than both system and file DSNs?
0

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