[erlang-questions] Erlang gen server and c++ client

Serge Aleynikov <>
Wed Jun 13 14:31:58 CEST 2012


See this tutorial for help:

http://trapexit.org/How_to_use_ei_to_marshal_binary_terms_in_port_programs

On 6/13/2012 5:51 AM, benefit wrote:
> Hello.
> Please help me.
> I need to make a erlang gen_server which works with an erlang port.
> An c++ application must connect to erlang port and send a string. Server
> should return the same string to the application.
> 
> I have troubles working with erlang.
> I found an example code :
> 
> connect(Message) ->
>     Cmd = "./myqtwindowapp \n",
>     Port = open_port({spawn,Cmd}, [stream,use_stdio,exit_status]),
>     Payload = string:concat(Message, "\n"),
>     erlang:port_command(Port, Payload),
>     receive
>         {Port, {data, Data}} ->
>             ?DBG("Received data: ~p~n", [Data]),
>         Other ->
>             io:format("Unexpected data: ~p~n", [Other])
>     after 15000 ->
>             ?DBG("Received nothing~n", [])
>     end.
>  
> 
> But i dont know how to run this code. I tried erl -run serv start but
> recieved error in do_boot. And how to include this code into a small module?
> Even i recieved error in dbg macros.
> 
> Please help me. Suggest me how to finalize. I am newbie here, please suggest
> me how to run this code or other.
> Any help is appreciated.
> 
> --
> View this message in context: http://erlang.2086793.n4.nabble.com/Erlang-gen-server-and-c-client-tp4655136.html
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