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<  Erlang  ~  "the book": chapter 11 irc lite exercises
simonc
Posted: Sun Sep 23, 2007 6:16 am Reply with quote
Joined: 23 Sep 2007 Posts: 2
I am stuck like you wouldn't believe on the exercises in chapter 11 of Programming Erlang.

I've read and re-read the chapter and the appendix on lib_chan and I realise I still don't understand how the irc lite application works.

Is there any alternative resource I can use to help me understand this? Or is there a simpler way in which I can ease myself into sockets?
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simonc
Posted: Sun Sep 23, 2007 6:56 pm Reply with quote
Joined: 23 Sep 2007 Posts: 2
if I edit chat_client.erl to send a roster message like this:
Code:
wait_login_response(Widget, MM) ->
    receive
   {chan, MM, ack} ->
   send_roster(Widget, MM);   
   %active(Widget, MM);
   Other ->
       io:format("chat_client login unexpected:~p~n",[Other]),
       wait_login_response(Widget, MM)
    end.

send_roster(Widget, MM)->
    lib_chan_mm:send(MM, {roster}),
    active(Widget, MM).



then edit chat_group.erl to expect a message of the form {Pid, {roster}} like this:

Code:
   {Pid, roster}->
       io:format("~p@~p", [roster, Pid])





I always get the following message once I recompile and restart the server and client:

Code:
<0.32.0>
chat_client login unexpected:{'EXIT',<0.38.0>,connectorFinished}
chat_client login unexpected:{chan,<0.40.0>,{setController,<0.40.0>}}
chat_client login unexpected:{chan,<0.40.0>,{send,ack}}
chat_client login unexpected:{chan,<0.40.0>,
                                   {send,
                                       {msg,
                                           "joe",
                                           <0.37.0>,
                                           "I'm starting the group"}}}


even if i delete my edit from chat_client and chat_group so they are the same as when I unzipped the files and recompile all and restart, I get the above message.

It seems like I'm stuck in a loop and can't get out.

I must be doing something really stupid?
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