Re: C++ Multicast Interface

[Jeff Donahoo <mjd@cc.gatech.edu>]

> > How do I join and leave multicast groups in C++ besides making a Tcl eval
> > call?  
> 
> I believe, if I am not mistaken, that you have to call Tcl, since the
> join/leave is protocol specific and the multicast protocols are implemnted
> in OTcl...  trying to modify any multicast routing tables in C++ without
> calling tcl will probably create errors, as you will be bypassing the
> multicast protocol messaging machinery alltogether. 

Thanks for the quick answer.  So now I am looking for the best (easiest)
way to do this.  If I have an agent in C++ that is attached to some node and
I know the ID of the group I want to leave, what's the best way to talk tcl
into allowing the agent to leave the group?  Note that I instantiated the
agent/node AND I joined the group all in tcl.  With my limited NS knowledge,
the only way I know how to do this is to call something like

tcl.evalc("$<nodename> leave group $<agentname> $<groupid>");

Is this the easy way to do it?  If not, can someone tell me what is?

Let's assume this is the best way.  While I do know the <groupid>, I do 
not know the tcl <nodename> or <agentname> because those names are all in 
the tcl.  What's the best way to get these names?  Does some member of the
C++ agent have this information?  I know that I could
create some tcl/C++ variable bindings of my own to pass this information in,
but is there a better (once again, easier) way?

Thanks,
Jeff

Michael J. Donahoo
Georgia Institute of Technology College of Computing
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