salut ca detecte juste si tu es connecté au net 
Option Explicit
' déclarations api wininet dll
Private Declare Function InternetGetConnectedState Lib "wininet.dll" _
(lpdwFlags As Long, _
ByVal dwReserved As Long) As Long
Private Declare Function InternetOpen Lib "wininet.dll" Alias "InternetOpenA" _
(ByVal lpszAgent As String, _
ByVal dwAccessType As Long, _
ByVal lpszProxyName As String, _
ByVal lpszProxyBypass As String, _
ByVal dwFlags As Long) As Long
Private Declare Function InternetOpenUrl Lib "wininet.dll" Alias "InternetOpenUrlA" _
(ByVal hInet As Long, _
ByVal lpszUrl As String, _
ByVal lpszHeaders As String, _
ByVal dwHeadersLength As Long, _
ByVal dwFlags As Long, _
ByVal dwContext As Long) As Long
Private Declare Function InternetCloseHandle Lib "wininet.dll" _
(ByVal hInet As Long) As Long
' constante - indique utilisation de la config de la Base de Registre
Private Const INTERNET_OPEN_TYPE_PRECONFIG = 0
' constantes - flags WinInet
Private Const INTERNET_FLAG_RELOAD = &H80000000
Private Const INTERNET_FLAG_KEEP_CONNECTION = &H400000
Private Const INTERNET_FLAG_NO_CACHE_WRITE = &H4000000
' constantes - flags pour InternetGetConnectedState
Private Const INTERNET_CONNECTION_MODEM = 1
Private Const INTERNET_CONNECTION_LAN = 2
Private Const INTERNET_CONNECTION_PROXY = 4
Private Const INTERNET_CONNECTION_MODEM_BUSY = 8
' énumération des états de connection
Public Enum InetConnectionStates
InternetConnectionModem = INTERNET_CONNECTION_MODEM
InternetConnectionLan = INTERNET_CONNECTION_LAN
InternetConnectionProxy = INTERNET_CONNECTION_PROXY
InternetConnectionModemBusy = INTERNET_CONNECTION_MODEM_BUSY
End Enum
' variables privées
Private m_Connection As Boolean
Private m_ModeConnection As InetConnectionStates
Private m_ModeConnectionDesc As String
Private m_SitesConnus As Collection
' initialisation
Private Sub Class_Initialize()
Set m_SitesConnus = New Collection
m_SitesConnus.Add "http://www.yahoo.com", "http://www.yahoo.com"
m_SitesConnus.Add "http://www.cnn.com", "http://www.cnn.com"
End Sub
'
Private Sub Class_Terminate()
Set m_SitesConnus = Nothing
End Sub
' propriétées publiques
Public Property Get TestSitesConnus() As Collection
Set TestSitesConnus = m_SitesConnus
End Property
Public Property Let TestSitesConnus(ByVal NewVal As Collection)
Set m_SitesConnus = NewVal
End Property
' propriétées publiques - en lecture seulement
Public Property Get Connected() As Boolean
Connected = m_Connection
End Property
'
Public Property Get ConnectMode() As InetConnectionStates
ConnectMode = m_ModeConnection
End Property
'
Public Property Get ConnectModeDesc() As String
ConnectModeDesc = m_ModeConnectionDesc
End Property
'
Public Sub Actualiser()
Dim Flags As Long
m_Connection = InternetGetConnectedState(Flags, 0&)
m_ModeConnection = Flags
If Flags And INTERNET_CONNECTION_MODEM Then
m_ModeConnectionDesc = "Modem"
If Flags And INTERNET_CONNECTION_MODEM_BUSY Then
m_ModeConnectionDesc = "Modem (Busy)"
m_Connection = TestUrls()
End If
ElseIf Flags And INTERNET_CONNECTION_LAN Then
m_ModeConnectionDesc = "LAN"
m_Connection = TestUrls()
ElseIf Flags And INTERNET_CONNECTION_PROXY Then
m_ModeConnectionDesc = "Proxy Server"
m_Connection = TestUrls()
End If
End Sub
' méthodes privées
Private Function TestUrls() As Boolean
Dim hInet As Long
Dim hUrl As Long
Dim Flags As Long
Dim url As Variant
' On va tester les URLs, si on arrive à se connecter à un des sites
' le PC est bien connecté.
hInet = InternetOpen(App.Title, INTERNET_OPEN_TYPE_PRECONFIG, vbNullString, vbNullString, 0&)
If hInet Then
Flags = INTERNET_FLAG_KEEP_CONNECTION Or INTERNET_FLAG_NO_CACHE_WRITE Or INTERNET_FLAG_RELOAD
For Each url In m_SitesConnus
hUrl = InternetOpenUrl(hInet, CStr(url), vbNullString, 0, Flags, 0)
If hUrl Then
Call InternetCloseHandle(hUrl)
TestUrls = True
Exit For
End If
Next url
End If
Call InternetCloseHandle(hInet)
End Function
