Ararat Synapse

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
	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
            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

Re: [Synalist] Problem with UDP client - server connection From: Jorge Aldo <jorgealdojr@bo...> - 2008-08-07 07:45 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 > > > > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > ------------------------------------------------------------------------ > > _______________________________________________ > synalist-public mailing list > synalist-public@... > https://lists.sourceforge.net/lists/listinfo/synalist-public >

Re: [Synalist] Problem with UDP client - server connection From: Thomas Kerkmann <thkerkmann@t-...> - 2008-08-07 18:36 Sorry to have bothered you all, I found my error, the thread I used already died before it could receive anything. I corrected that and now it works. Thanks Lukas for your fabulous work. Synapse and Synaser are my favorite communication libraries. Best regards Thomas

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