check whether a user connected to the Internet or not?

How do you check whether a user is connected to the Internet or 开发者_如何学JAVAnot?

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First define internet (e.g. sometimes only certain services are accessable, like when only HTTP traffic through a proxy is allowed).

In general, the only somewhat reliable solution is simply to try and check if the targeted service responds.

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What flavor of Pascal are you using? You should have some Internet library available. If you want to know if there's a connection available, the easiest way to do that is to see if you can connect to anything. How exactly you do this depends on your internet library, but if I had to do this I'd simply try to ping google.com and see if it succeeds or not.