Visual Basic Code of the Week (COTW)
Issue #30
All content and source code is Copyright (c) 1998 by C&D Programming Corp. No part of this issue can be reprinted or distributed in any manner without express written permission of C&D Programming Corp.

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Requirements for this Issue

The source code in this issue is designed for Visual Basic 5.0 and higher. It will probably work in VB4 32-bit with some minor changes.

In this Issue

This issue will introduce some methods for using the Dial-Up Networking features of Windows 95 and NT.


Part of this issue was submitted by Rick G. from Kansas. Thanks Rick!

DialUpNetworking Class Module


This module uses a couple of API calls in RASAPI32.DLL to use the Dial-Up Networking (DUN) features of Windows 95/NT. In future issues we will cover topics on how to retrieve the status of a DUN call and getting lists of available DUN entries.


Public Function Dial(pEntryName As String, pUsername As String, pPassword As String) As Boolean
Public Function HangUp() As Boolean
Public Function ErrorMessage() As String



Nothing is returned upon a successful call, except that Dial will return True. If Dial returns False you can use the ErrorMessage function to retrieve the appropriate error.

Sample Usage

An example that calls a connection named "Internet" with the username "user" and a password "pass"

    Dim DUN As New DialUpNetworking

    If Not DUN.Dial("Internet", "user", "pass") Then
        MsgBox DUN.ErrorMessage
    End If
    ' Do something with the connection

Source Code

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