BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  locate server on LAN          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Eugene V. Goldberg Guest Posted: Sat Jan 17, 2004 11:45 am    Post subject: locate server on LAN I have a server application on LAN listening on some port, but i dont know IP... I know this can be done with UDP broadcast...Any samples? Thanx, Eugene. Back to top Claire Guest Posted: Tue Jan 20, 2004 12:42 am    Post subject: Re: locate server on LAN "Eugene V. Goldberg" <egold (AT) mts-nn (DOT) ru> wrote Quote: I have a server application on LAN listening on some port, but i dont know IP... I know this can be done with UDP broadcast...Any samples? Thanx, Eugene. From the client, UDP broadcast a message to ip address 255.255.255.255 to whichever port the server is listening. The server should then reply so that the client can pick up the IP address of the server. Only use this method during discovery then swap to the real IP/port later to keep the network traffic to a minimum. Back to top Eugene V. Goldberg Guest Posted: Tue Jan 20, 2004 4:59 am    Post subject: Re: locate server on LAN How i can do that with Indy UDP components? "Claire" <corky (AT) corkyscave (DOT) com> wrote Quote: "Eugene V. Goldberg" <egold (AT) mts-nn (DOT) ru> wrote in message news:40092061 (AT) newsgroups (DOT) borland.com... I have a server application on LAN listening on some port, but i dont know IP... I know this can be done with UDP broadcast...Any samples? Thanx, Eugene. From the client, UDP broadcast a message to ip address 255.255.255.255 to whichever port the server is listening. The server should then reply so that the client can pick up the IP address of the server. Only use this method during discovery then swap to the real IP/port later to keep the network traffic to a minimum. Back to top Claire Guest Posted: Tue Jan 20, 2004 8:56 am    Post subject: Re: locate server on LAN Ive posted a little demo source on the attachment group for Eugene V Goldberg Hope this helps Back to top Eugene V. Goldberg Guest Posted: Tue Jan 20, 2004 10:14 am    Post subject: Re: locate server on LAN Thanx alot Claire! "Claire" <corky (AT) corkyscave (DOT) com> wrote Quote: Ive posted a little demo source on the attachment group for Eugene V Goldberg Hope this helps Back to top Eugene V. Goldberg Guest Posted: Tue Jan 20, 2004 10:26 am    Post subject: Re: locate server on LAN Claire, I think instead of Str := UDPClient.ReceiveString(IP,Port,2); it should be Str := UDPClient.ReceiveString(IP,12345,2); since Port is not assigned anywhere. Dont i need to set BroadcastEnabled to True? Eugene. "Claire" <corky (AT) corkyscave (DOT) com> wrote Quote: Ive posted a little demo source on the attachment group for Eugene V Goldberg Hope this helps Back to top Claire Guest Posted: Tue Jan 20, 2004 6:55 pm    Post subject: Re: locate server on LAN "Eugene V. Goldberg" <egold (AT) mts-nn (DOT) ru> wrote Quote: Claire, I think instead of Str := UDPClient.ReceiveString(IP,Port,2); it should be Str := UDPClient.ReceiveString(IP,12345,2); since Port is not assigned anywhere. Dont i need to set BroadcastEnabled to True? Eugene. Hi Eugene, sorry for the delay in replying. I thought, as you mentioned, that BroadcastEnabled should be true but it seemed to work either way. Of course I was only running it on my local machine and it may work different across a network. IP and Port are var parameters and return the IP and Port of the machine that sent the message to the UDPClient , so you don't initialize them. When Ive used this method in the past, I use the UDP discovery port purely for this task (enabling and disabling as I need it) and do the real communication through a different set of controls/ports. I ignored the value returned in the Port variable above as I'm only interested in the IP address of the server. 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