using of lNet
lazarus / 38-Networking and Web Programming

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skaner1900 · 2011-04-03 18:35

Hi.
Examples for lNet are very poor, so maybe somebody know how (TCP/IP):
1. Accept or reject connection (server)
2. Send message to only one user (server and client)
3. Check, who sent message which we are receiving (server and client)
4. Secure application by intercept messages by unauthorized person
Thanks

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Dibo · 2011-04-03 18:45

I am using lHTTP component only but sender is in aSocket param:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TFormMain.LTCPComponentReceive(aSocket: TLSocket);begin 
aSocket.SendMessage('Reply to sender');end;

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Leledumbo · 2011-04-03 18:59

QuoteExamples for lNet are very poorReally? They're very good to me.
What makes you think so?

For questions below, drop TLTCPComponent to your form first.
Quote1. Accept or reject connection (server)Call Listen method to host
an address, then handle OnAccept. You can check PeerAddress/PeerPort
to determine whether to accept or reject, if you do nothing it will
default to Accept() (because it's already accepted). Use Disconnect()
to reject.
Quote2. Send message to only one user (server and
client)TLTCPComponent can act as both server and client. First
Connect() to target (in this case, we don't care whether it's client
or server), then use Send() or SendMessage() to send the message.
Quote3. Check, who sent message which we are receiving (server and
client)See answer for question no. 1
Quote4. Secure application by intercept messages by unauthorized
personSame as above.

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Almindor · 2011-04-03 21:38

Quote from: skaner1900 on April 03, 2011, 08:35:56 pmHi.
Examples for lNet are very poor, so maybe somebody know how (TCP/IP):
1. Accept or reject connection (server)
2. Send message to only one user (server and client)
3. Check, who sent message which we are receiving (server and client)
4. Secure application by intercept messages by unauthorized person
Thanks

You're always welcome to submit patches or new example demoes to lNet.
It's true that none of your questions are directly answered by an
example, but I think the demoes in combination with the documentation
should suffice to explain what needs to be done.

Also, your "authentication" (point 4) use case is specific and needs
to be handled by the user/application, not lNet. Leledumbo answered
all the questions nicely, so I won't repeat it.