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

MORE INFORMATION

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.