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How does ICQ know a connection was made?

Posted on 1998-11-30
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Last Modified: 2010-04-01
I can see that the ICQ program has an agent that "knows"
when a network connection was made (through dial-up,LAN etc.).
How do they do that (from their source code)?
Thanks.
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Question by:gilbert_chang
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11 Comments
 
LVL 6

Expert Comment

by:thresher_shark
ID: 1178894
I don't know how THEY do it.  I suspect they just continually try to ping a server (like mirabilis.com) until it is successful.  Then ICQ connects.  If you want source code for pinging a server, I think I can provide it.
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Author Comment

by:gilbert_chang
ID: 1178895
I would appreciate it.
Thanks.
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LVL 5

Expert Comment

by:yonat
ID: 1178896
No, they use the RAS API. Take a look at RasConnectionNotification API function.
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LVL 6

Expert Comment

by:thresher_shark
ID: 1178897
It looks like yonat's solution is better, but in case you want a ping sample, go here:

http://www.codeguru.com/network/ping.shtml
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Expert Comment

by:darklight
ID: 1178898
What about for MFC ?
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LVL 5

Expert Comment

by:yonat
ID: 1178899
What about it? This is a simple API function, not something you need a class wrapper for.
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Accepted Solution

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yonat earned 100 total points
ID: 1178900
The API function RasConnectionNotification() will allow you to be notified when a connection is made.
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Author Comment

by:gilbert_chang
ID: 1178901
RasConnectionNotification() only lets me know when a new RAS connection is made. What about other connections (Not dial-up),
Such as LAN connections?
Thanks.
0
 
LVL 5

Expert Comment

by:yonat
ID: 1178902
You'll need to write a WinSock "Layered Service Provider" for that. This is much more complicated. If you really want to do that, see http://www.sockets.com/winsock2.htm .
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LVL 5

Expert Comment

by:yonat
ID: 1178903
BTW, ICQ does use RasConnectionNotification() (I know some people from Mirabilis...)
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LVL 13

Expert Comment

by:Mirkwood
ID: 1178904
Bought This Question.
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