OpenEuphoria

Re: Is this computer connected to the Internet

• Posted by Greg Haberek <ghaberek at gmail.com> Jul 31, 2005
• 715 views

> Can anyone suggest a way that a Euphoria program can, by way of a system
> call, determine if the computer is presently connected to the Internet?
> Other than by trying to access a web page ...

Searching MSDN works wonders. This allows your Win32Lib app to
determine what type of connection is present. Multiple values are
or'ed together. A return value of 0 (false) or
INTERNET_CONNECTION_OFFLINE would show there is no connection
available.

HTH,
~Greg

-- Test for an Internet connection
include Win32Lib.ew

global constant
    wininet = registerw32Library( "wininet.dll" ),
    xInternetGetConnectedState = registerw32Function( wininet,
"InternetGetConnectedState", {C_POINTER,C_LONG}, C_INT )

global constant
    -- values for lpdwFlags
    INTERNET_CONNECTION_MODEM    = #01,
    INTERNET_CONNECTION_LAN    = #02,
    INTERNET_CONNECTION_PROXY    = #04,
    INTERNET_CONNECTION_MODEM_BUSY    = #08,    -- no longer used
    INTERNET_RAS_INSTALLED    = #10,
    INTERNET_CONNECTION_OFFLINE    = #20,
    INTERNET_CONNECTION_CONFIGURED    = #40

global function InternetGetConnectedState()
-- check for an internet connection

    atom lpdwFlags, dwReserved, retv

    lpdwFlags = allocate( 4 )
    dwReserved = 0
=09
    retv = w32Func( xInternetGetConnectedState, {lpdwFlags, dwReserved} )
    if retv = w32True then
        retv = peek4u( lpdwFlags )
    end if
=09
    free( lpdwFlags )
=09
    return retv
end function

constant StateDesc = {
    -- connection state descriptions
    {INTERNET_CONNECTION_MODEM, "Local system uses a modem to connect
to the Internet."},
    {INTERNET_CONNECTION_LAN, "Local system uses a local area network
to connect to the Internet."},
    {INTERNET_CONNECTION_PROXY, "Local system uses a proxy server to
connect to the Internet."},
    {INTERNET_CONNECTION_MODEM_BUSY, "No longer used."},
    {INTERNET_RAS_INSTALLED, "Local system has RAS installed."},
    {INTERNET_CONNECTION_OFFLINE, "Local system is in offline mode."},
    {INTERNET_CONNECTION_CONFIGURED, "Local system has a valid
connection to the Internet," &
        " but it might or might not be currently connected."}}

global function InternetGetConnectedDesc()
-- gets a text description of internet connection

    atom state
    sequence desc
=09
    state = InternetGetConnectedState()
=09
    desc = ""
    for i = 1 to length(StateDesc) do
        if and_bits( state, StateDesc[i][1] ) then
            desc &= StateDesc[i][2] & '\n'
        end if
    end for

    return desc
end function

puts( 1, InternetGetConnectedDesc() )
VOID = wait_key()