Will you guys test this? (Internet Connection)

Hey everyone,

I found the following piece of code somewhere, and was just
wondering if you guys (and girls) would check it out to see if
it works OK for you.

I need a good, reliable code to check to see if the computer is
connected to the Internet. It needs to work with cable modems,
dial-up modems, and networks.

I'm pretty sure this will work fine, but I sure would appreciate it
if you would check it out.

Thanks in advance,
Ron


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Private Const FLAG_ICC_FORCE_CONNECTION = &H1

Private Declare Function InternetCheckConnection Lib "wininet.dll" Alias "InternetCheckConnectionA" (ByVal lpszUrl As String, ByVal dwFlags As Long, ByVal dwReserved As Long) As Long


Private Sub Form_Load()
If InternetCheckConnection("http://www.yahoo.com", FLAG_ICC_FORCE_CONNECTION, 0&) = 0 Then
MsgBox "Connection failed!", vbInformation
Else
MsgBox "Connection succeeded!", vbInformation
End If
End Sub

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It cause my VB to crash and I cant even end task on it because it keeps replicating the project... so in terms of reliability.. in a word NO
Mega.

yeah. Worked fine for me. Tried it a few times. Very reliable

said connection succeeded whatever the hell that means

Hey Mega_Man ........do you know why it caused VB to crash?

Quote:

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Originally posted by rdcody
Hey Mega_Man ........do you know why it caused VB to crash?

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Yes I do now... It wasn't your code, it was my firewall. Sorry.
However, I have tried your code on my machine at work which acceses the internet through a proxy and your code said "Connection Failed". I Don't know whether you can incorporate code to check for the existence of a proxy or not.
Anyway, hope this is usefull feedback.

Mega.

This method is not foolproof. Often it might give you wrong values while working behind a proxy or firewalls. A better way is to ping(if a direct connection is possible) or to open a small page on the web through Inet control.

Works with DSL connection on Xp with the XP firewall enabled with connection sharing...

Works for me , windows XP pro , behind router network. adsl connection

The firewall built in the XP allows all traffic to pass. It blocks only the incoming traffic. A router is meant for routing traffic, and therefore it will succeed. This code is most likely to fail where proxy's and firewalls located on the network are used to access internet.

This is an almost direct example out of the API Guide 3.7. It works fine, but I don't know about the firewall thing.