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Saturday, May 22, 2010

How to Check Internet Connectivity using VBA

The following code snippet uses API functions to check Internet connectivity and also the type of connection
:
Public Declare Function InternetGetConnectedState _
                         Lib "wininet.dll" (lpdwFlags As Long, _
                                            ByVal dwReserved As Long) As Boolean

Private Declare Function InternetGetConnectedStateEx Lib "wininet.dll" Alias "InternetGetConnectedStateExA" ( _
ByRef lpdwFlags As Long, _
ByVal lpszConnectionName As String, _
ByVal dwNameLen As Long, _
ByVal dwReserved As Long) As Long


'Local system uses a modem to connect to the Internet.
Private Const INTERNET_CONNECTION_MODEM As Long = &H1

'Local system uses a LAN to connect to the Internet.
Private Const INTERNET_CONNECTION_LAN As Long = &H2

'Local system uses a proxy server to connect to the Internet.
Private Const INTERNET_CONNECTION_PROXY As Long = &H4

The following API functions are used

Function IsConnected() As Boolean
    
    Dim Stat As Long
    
    IsConnected = (InternetGetConnectedState(Stat, 0&) <> 0)
    
    If IsConnected And INTERNET_CONNECTION_LAN Then
        MsgBox "Lan Connection"
    ElseIf IsConnected And INTERNET_CONNECTION_MODEM Then
        MsgBox "Modem Connection"
    ElseIf IsConnected And INTERNET_CONNECTION_PROXY Then
        MsgBox "Proxy"
    End If
End Function

If you want to know just if it is connected or not you can use the following:

CBool(InternetGetConnectedStateEx(0, vbNullString, 512, 0&))

2 comments:

  1. excellent, worked instantly. Thanks for this.

    ReplyDelete
  2. It sure doesn't work for me. If I go outside and disconnect the cable coming into my house, and then run this code it still thinks I'm connected. How do I tell for sure that I can actually reach the internet? Almost every answer I've been able to find assumed set if I can connect to my local wifi, that I'm connected to the internet. I need to know if I can really surf the web. Anyone know how to do this?

    ReplyDelete