erlang

I'm writing a simple Erlang program that requests an URL and parses the response as JSON. To do that, I need to use a Library called Jiffy. I downloaded and compiled it, and now i have a .beam file along with a .app file. My question is: How do I use it? How do I include this library in my program?. I cannot understand why I can't find an answer on the web for something that must be very crucial. Erlang has an include syntax, but receives a .hrl file. Thanks! You don't need to include the file in your project. In Erlang, it is at run time that the code will try to find any function. So the

Did a fresh install of Apache CouchDB on Windows 7 x64, using setup-couchdb-1.4.0_R16B01.exe Can access futon without any problem Can programmatically create databases and add documents (including views) Get the error pasted below when executing a view (even when executing the simplest default non-edited temporary map-reduce in Futon "map": "function(doc){ emit(null, doc); }" (in which case the same exact error text is shown in a browser pop-up) Does this error make sense to anyone? Where should I start my investigation? Notes: The path c:/cygwin/relax/APACHE~1.0/src/couchdb/ does not exist on

I have made an OTP compliant application where i have a gen_server and a supervisor. Also i have a script to start them. My script contains something like this. erl -pa module_name/ebin -name abc@hostname -setcookie test -s module_sup start_link() This does not start the supervisor. But when i do module_sup:start_link() inside the shell, it works. Also when i do erl -pa module_name/ebin -name abc@hostname -setcookie test -s module_srv start_link() i.e the server alone without the supervisor, the server gets started. So, what am i doing wrong here. Are we not allowed to start supervisor in such

I'm trying to create a supervisor which handles adding dynamic gen_servers. for a reason something is failing and I'm not really sure what. -module(supervisor_mod). -behaviour(supervisor). -export([start_link/0, add_child/1]). -export([init/1]). start_link() -> Pid=supervisor:start_link({local, ?MODULE} , ?MODULE, []), {ok,Pid}. init(_Args) -> {ok, {{simple_one_for_one, 10, 60}, [{example_proc, {example_proc, start_link, []}, permanent, brutal_kill, worker, [example_proc]}]}}. add_child(Name)-> supervisor:start_child(supervisor_mod, {example_proc, {example_proc, start_link, []}, permanent,

I heard that an atom table can fill up in Erlang, leaving the system open for DDoS unless you increase the number of atoms that can be created. It looks like binary_to_existing_atom/2 is the solution to this. Can anyone explain exactly how binary_to_atom/2 is a security implication and how binary_to_existing_atom/2 solves this problem? When an atom is first used it is given an internal number and put in an array in the VM. This array is allocated statically and can fill up if enough different atoms are used. binary_to_existing_atom will only convert a binary string to an atom which already

I would like to write a function to check if the input is a string or not like this: is_string(Input) -> case check_if_string(Input) of true -> {ok, Input}; false -> error end. But I found it is tricky to check whether the input is a string in Erlang. The string definition in Erlang is here: http://erlang.org/doc/man/string.html . Any suggestions? Thanks in advance. In Erlang a string can be actually quite a few things, so there are a few ways to do this depending on exactly what you mean by "a string". It is worth bearing in mind that every sort of string in Erlang is a list of character or