Par2: Detecting internet connection 2003-09-02 -- Paul Attryde > Can anyone maybe help me on this one... It's a Piece of VB code, for
> checking the Internet Connection... But for some reason.. it keep on
> returning a Zero
>
> This is the VB Code:
>
> Dim dwFlags As Long
> Dim sNameBuf As String, msg As String
> Dim lPos As Long
> sNameBuf = String$(513, 0)
> If InternetGetConnectedStateEx(dwFlags, sNameBuf, 512, 0&) Then
> lPos = InStr(sNameBuf, vbNullChar)
> If lPos > 0 Then
> sConnectionName = Left$(sNameBuf, lPos - 1)
> Else
> sConnectionName = ""
> End If
> msg = "Your computer is connected to Internet" & vbCrLf & "Connection
> Name: " & sConnectionName
> If (dwFlags And INTERNET_CONNECTION_LAN) Then
> msg = msg & vbCrLf & "Connection use LAN"
> ElseIf lFlags And INTERNET_CONNECTION_MODEM Then
> msg = msg & vbCrLf & "Connection use modem"
> End If
> If lFlags And INTERNET_CONNECTION_PROXY Then msg = msg & vbCrLf &
> "Connection use Proxy"
> If lFlags And INTERNET_RAS_INSTALLED Then
> msg = msg & vbCrLf & "RAS INSTALLED"
> Else
> msg = msg & vbCrLf & "RAS NOT INSTALLED"
> End If
> If lFlags And INTERNET_CONNECTION_OFFLINE Then
> msg = msg & vbCrLf & "You are OFFLINE"
> Else
> msg = msg & vbCrLf & "You are ONLINE"
> End If
> If lFlags And INTERNET_CONNECTION_CONFIGURED Then
> msg = msg & vbCrLf & "Your connection is Configured"
> Else
> msg = msg & vbCrLf & "Your connection is not Configured"
> End If
> Else
> msg = "Your computer is NOT connected to Internet"
> End If
> MsgBox msg, vbInformation, "Checking connection"
> End Sub
Off the top of my head it'd be something like this:
map
module('wininet')
InternetGetConnectedState(ulong,ulong,ulong,ulong),bool,pascal
end
end
result bool
name cstring(512)
code
result = InternetGetConnectedState( address(flags), address(name),
size(name), 0)
if result = 1
! connected
else
! not connected
end
But, make sure you also read these, because the first describes your
problem exactly ...
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q315035
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q242558
http://www.codeguru.com/internet/isinternetconnected.shtml
http://groups.google.com/groups?q=detect+internet+connection&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=v2an1ugitk4o8ddh60ntle5kr8u6k5u6jk%404ax.com&rnum=2
AFAIK there's no 100% foolproof way to detect an internet connection - I
believe you'll need a combination of 2 or 3 techniques to get close ...
James Cooke:
No more GPF. But - I sill get as constant "Not Connected" message.
This is the revised code:
Program
map
module('wininet')
InternetGetConnectedStateEx(ulong,ulong,ulong,ulong),bool,pascal
end
end
result bool
thename cstring(512)
Flags long
INTERNET_CONNECTION_MODEM Equate(1h)
INTERNET_CONNECTION_LAN Equate(2h)
INTERNET_CONNECTION_PROXY Equate(4h)
INTERNET_RAS_INSTALLED Equate(10h)
INTERNET_CONNECTION_OFFLINE Equate(20h)
INTERNET_CONNECTION_CONFIGURED Equate(40h)
code
Flags = INTERNET_CONNECTION_CONFIGURED
result = InternetGetConnectedStateEx( address(INTERNET_CONNECTION_LAN),
address(thename), size(thename), 0)
if result = 1
Message('Connected')
else
Message('Not Connected')
end
>Paul Attryde:
My mistake
InternetGetConnectedState() takes 2 params
InternetGetConnectedStateEx() takes 4.
Change the prototype & call to use InternetGetConnectedStateEx() and it
should work fine.
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