Kerkmann, Thomas escreveu:
>
> Hi all,
>
> I have created an UDP server like the example in the HOWTOs.
> Now I want to write a UDP client, which
> connects to the server
>
UDP doesnt really "connect" to the server, if i understood right, the
connect method just says where the TCP/IP should send the packet to
>
> sends a message
> receives a reply
>
> I did as follows:
>
> sf_sock := tUDPBlockSocket.Create;
> try
> // sf_sock.Bind(ListenIP, sfPort); // don't know if necessary
>
IIRC its necessary to bind to the port, and i would rather use two
sockets (One to send and another to receive, just in case...)
>
> sf_sock.Connect(IPAddr, sfPort);
> if sf_sock.LastError = 0 then
> begin
> // send request
> sf_sock.SendString(sRequest + CR);
> // read reply
> if sf_sock.LastError = 0 then
> begin
> result := trim(sf_sock.RecvPacket(1500));
> if sf_sock.LastError = 0 then
> begin
> // fine we are done
> HandleResult(result);
> end
> else
> begin
> // ALWAYS ENDS UP HERE WITH THE MESSAGE
> // a connection attempt failed because the
> connected party did not
> // properly respond after a period of time, or
> established connection
> // failed because connected host has failed to
> respond
>
> Logout('SF reply failed ' +
> SysErrorMessage(sf_sock.LastError));
> HandleError(result);
> end;
> end
> else
> begin
> Logout('SF send failed');
> end;
> end
> else
> begin
> Logout('SF connect failed');
> end;
> // close connection
> sf_sock.CloseSocket;
> except
> on E: Exception do
> LogoutSyscon(E.Message);
> end;
> sf_sock.Free;
>
> But always end up at marked position. So I do not get the answer from
> the server.
>
> Can somebody please advise what I'm doing wrong ?
>
> Thomas Kerkmann
>
>
>
>
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