Check Internet Connection

[Sonic42]

I'm looking for code that would help me check the user's internet connection. For example, when Button1 is clicked a MsgBox appears that displays either "Connected" or "Disconnected" based on whether they are connected to the internet or not.

[vb5prgrmr]

There are several different ways in which to do this...

http://lmgtfy.com/?q=vb6+test+internet+connection

Good Luck

[jhai_salvador]

Here.. try this..

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

Dim sConnType As String * 255

Sub CheckNetCon()
Dim Ret As Long
Ret = InternetGetConnectedStateEx(Ret, sConnType, 254, 0)
If Ret = 1 Then
    MsgBox "You are connected to Internet via a " & sConnType, vbInformation
Else
    MsgBox "You are not connected to internet", vbInformation
End If

End Sub

Reference: http://www.ex-designz.net/apidetail.asp?api_id=465

[dwel]

you can use followig code to check internet connection at form
Private Declare Function InternetGetConnectedState Lib "wininet" _
(ByRef dwFlags 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

'No longer used.
Private Const INTERNET_CONNECTION_MODEM_BUSY As Long = &H8

Private Const INTERNET_RAS_INSTALLED As Long = &H10
Private Const INTERNET_CONNECTION_OFFLINE As Long = &H20
Private Const INTERNET_CONNECTION_CONFIGURED As Long = &H40

Private Sub Command1_Click()

Text1.Text = IsNetConnectViaLAN()
Text2.Text = IsNetConnectViaModem()
Text3.Text = IsNetConnectViaProxy()
Text4.Text = IsNetConnectOnline()
Text5.Text = IsNetRASInstalled()
Text6.Text = GetNetConnectString()

End Sub

Private Function IsNetConnectViaLAN() As Boolean

Dim dwflags As Long

'pass an empty variable into which the API will
'return the flags associated with the connection
Call InternetGetConnectedState(dwflags, 0&)

'return True if the flags indicate a LAN connection
IsNetConnectViaLAN = dwflags And INTERNET_CONNECTION_LAN

End Function

Private Function IsNetConnectViaModem() As Boolean

Dim dwflags As Long

'pass an empty variable into which the API will
'return the flags associated with the connection
Call InternetGetConnectedState(dwflags, 0&)

'return True if the flags indicate a modem connection
IsNetConnectViaModem = dwflags And INTERNET_CONNECTION_MODEM

End Function

Private Function IsNetConnectViaProxy() As Boolean

Dim dwflags As Long

'pass an empty variable into which the API will
'return the flags associated with the connection
Call InternetGetConnectedState(dwflags, 0&)

'return True if the flags indicate a proxy connection
IsNetConnectViaProxy = dwflags And INTERNET_CONNECTION_PROXY

End Function

Private Function IsNetConnectOnline() As Boolean

'no flags needed here - the API returns True
'if there is a connection of any type
IsNetConnectOnline = InternetGetConnectedState(0&, 0&)

End Function

Private Function IsNetRASInstalled() As Boolean

Dim dwflags As Long

'pass an empty variable into which the API will
'return the flags associated with the connection
Call InternetGetConnectedState(dwflags, 0&)

'return True if the flags include RAS installed
IsNetRASInstalled = dwflags And INTERNET_RAS_INSTALLED

End Function

Private Function GetNetConnectString() As String

Dim dwflags As Long
Dim msg As String

'build a string for display
If InternetGetConnectedState(dwflags, 0&) Then

If dwflags And INTERNET_CONNECTION_CONFIGURED Then
msg = msg & "You have a network connection configured." & vbCrLf
End If

If dwflags And INTERNET_CONNECTION_LAN Then
msg = msg & "The local system connects to the Internet via a LAN"
End If

If dwflags And INTERNET_CONNECTION_PROXY Then
msg = msg & ", and uses a proxy server. "
Else
msg = msg & "."
End If

If dwflags And INTERNET_CONNECTION_MODEM Then
msg = msg & "The local system uses a modem to connect to the Internet. "
End If

If dwflags And INTERNET_CONNECTION_OFFLINE Then
msg = msg & "The connection is currently offline. "
End If

If dwflags And INTERNET_CONNECTION_MODEM_BUSY Then
msg = msg & "The local system's modem is busy with a non-Internet connection. "
End If

If dwflags And INTERNET_RAS_INSTALLED Then
msg = msg & "Remote Access Services are installed on this system."
End If

Else

msg = "Not connected to the internet now."

End If

GetNetConnectString = msg

End Function