Hi Primoz,
maybe the ReuseAddr property?
This is my Implementation:
procedure TUDP.StartRx;
begin
Disconnect;
pLocalIP:=trim(pLocalIP);
if (pLocalIP<>'')and(pLocalPort>0) then
begin
fWS.Proto:='udp';
fWS.MultiThreaded:=pMultiThreaded;
fWS.Addr:=pLocalIP;
fWS.Port:=inttostr(pLocalPort);
if fWS.Addr='' then
fWS.Addr:='0.0.0.0';
if pMulticast then
begin
fWS.MultiCast:=true;
fWS.ReuseAddr:=true;
fWS.MultiCastAddrStr:=pPeerIP;
end;
fWS.Listen;
fWS.SocketRcvBufSize:=fRXSize;
if pMulticast then
setsockopt(fWS.HSocket,IPPROTO_IP,IP_MULTICAST_TTL,@pMulticastTTL,sizeof(pMulticastTTL));
end
else
TLogger.Log('UDP socket start rx error LocalIP='+pLocalIP+'
LocalPort='+inttostr(pLocalPort),lsError,true);
end;
Bye
Emanuele
Il 16/06/2011 12:29, Primoz Gabrijelcic ha scritto:
> Hello, Everybody!
>
> I have some problems with multicasting implementation, most probably
> caused by my insufficient understanding of the subject.
>
> I have multiple applications that can stream and listen on multicasted
> traffic. Because I want them to bind only to one physical interface,
> I'm initializing receiving socket as follows:
>
> Port := 9200; // multicast port
> Addr := '172.16.1.1'; // IP address of the physical adapter I want to
> bind to
> MultiCastAddrStr := '239.192.1.1';
> MultiCast := true;
> Proto := 'udp';
>
> This works fine as long as I only want to listen from one program on
> this computer. As soon as I start the second instance which binds to
> the same multicast address and port, the second .Listen fails with
> error 10048.
>
> I was living under understanding that it's entirely possible to listen
> on the same multicast socket from more than one application on a
> single computer and VLC player confirms me in those beliefs - I can
> easily start two VLCs on same multicast address:port and both will
> play incoming video.
>
> Most probably the error is just in my understanding of how
> multicasting is implemented inside ICS. Can you please point to the
> error in my approach?
>
> Best regards,
> Primoz
>
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--
Ing. Emanuele Bizzarri
Software Development Department
e-works s.r.l.
41011 - Campogalliano - Modena - Italy
tel. +39 059 2929081 int. 23
fax +39 059 2925035
e-mail: e.bizza...@e-works.it - http://www.e-works.it
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