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How To Determine If Internet Explorer Is Offline from an ActiveX Document

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This article was previously published under Q200027

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Summary

When developing Internet applications, developers need to account for end users with a wide variety of system environments with different ways of connecting to the Internet. This ActiveX Document sample code demonstrates how to determine if Internet Explorer is offline.

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More information

Use the following sample code to determine if Internet Explorer is offline:
  1. Start a new ActiveX Document project. UserDocument1 is added by default.
  2. Add the following code to the general declarations section of UserDocument1:
    Dim bOffline As Boolean

Private Function get_Offline() As Boolean ' (VARIANT_BOOL * bOffline)
 Dim hr As Long
 Dim ci As INTERNET_CONNECTED_INFO
 Dim ci_len As Long
 ci_len = 8
 Dim ret As Long

 ret = InternetQueryOption(0&, INTERNET_OPTION_CONNECTED_STATE, _
        ci, ci_len)
get_Offline = Not ((ci.dwConnectedState And INTERNET_STATE_CONNECTED) = 
INTERNET_STATE_CONNECTED)
End Function

Private Sub put_Offline(bOffline As Boolean)
  Dim hr As Long
  Dim ci As INTERNET_CONNECTED_INFO
  Dim ret As Long
  If bOffline Then
     ci.dwConnectedState = INTERNET_STATE_DISCONNECTED_BY_USER
     ci.dwFlags = ISO_FORCE_DISCONNECTED
  Else
     ci.dwConnectedState = INTERNET_STATE_CONNECTED
  End If

  ret = InternetSetOption(0&, INTERNET_OPTION_CONNECTED_STATE, _
               ci, LenB(ci))
End Sub
  3. Add a Command button to UserDocument1 and insert this code:
    Private Sub Command1_Click()
   MsgBox "Offline = " & get_Offline()
End Sub
  4. Add a Command button to form1 and insert this code:
    Private Sub Command2_Click()
   put_Offline True
End Sub
  5. Add a standard module to the project and insert this code:
       Option Explicit
   Public Type INTERNET_CONNECTED_INFO
      dwConnectedState As Long
      dwFlags As Long
   End Type


   Public Declare Function InternetSetOption Lib "wininet.dll" Alias _
     "InternetSetOptionA" (ByVal hInternet As Long, _
       ByVal lOption As Long, ByRef sBuffer As Any, _
         ByVal lBufferLength As Long) As Integer

' Queries an Internet option on the specified handle
   Public Declare Function InternetQueryOption Lib "wininet.dll" Alias _
    "InternetQueryOptionA" (ByVal hInternet As Long, _
       ByVal lOption As Long, ByRef sBuffer As Any, _
       ByRef lBufferLength As Long) As Integer

   Public Const INTERNET_OPTION_CONNECTED_STATE = 50
   Public Const INTERNET_STATE_CONNECTED = 1

' // disconnected from network
    Public Const INTERNET_STATE_DISCONNECTED = 2
' 0x00000010    //  disconnected by user request
    Public Const INTERNET_STATE_DISCONNECTED_BY_USER = &H10
'// no network requests being made (by Wininet)
    Public Const INTERNET_STATE_IDLE = &H100
'// network requests being made (by  Wininet)
    Public Const INTERNET_STATE_BUSY = &H200
'// 
'// ISO_FORCE_DISCONNECTED -
'// if set when putting Wininet into disconnected mode,
'// all outstanding requests will be aborted with a cancelled error
'// 

Public Const ISO_FORCE_DISCONNECTED = 1
  6. Save Project and press F5 to test.

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Keywords: KB200027, kbactivedocs, kbhowto

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Article Info
Article ID : 200027
Revision : 3
Created on : 7/1/2004
Published on : 7/1/2004
Exists online : False
Views : 557