how to do an ftp connection properly

[António Ramos]

Hello i saw this code to connect to an ftp server.

However for a real code it would have to be changed to trap errors in between right?

I´m newbie and dont know how to fix this issue.

Can someone give me some ideas ?

Regards

:inets.start
{:ok, pid} = :inets.start(:ftpc, host: 'erlang.org')
:ftp.user(pid, 'guest', 'password')
:ftp.pwd(pid)
:ftp.cd(pid, 'appl/examples')
:ftp.lpwd(pid)
:ftp.lcd(pid, '/home/eproj/examples')
:ftp.recv(pid, 'appl.erl')
:inets.stop(:ftpc, pid)

[António Ramos]

My newbie way of doing it.

Doing fine until reached chdir on this line of code

IO.inspect :ftp.cd(pid, "/MEMCARD")

i get this error 

     ** (FunctionClauseError) no function clause matching in :ftp.is_name_sane/1

     stacktrace:

       (inets) ftp.erl:2454: :ftp.is_name_sane("/MEMCARD")

       (inets) ftp.erl:283: :ftp.cd/2

       (ps1) lib/ps1.ex:24: Ps1.chdir/2

       test/ps1_test.exs:6

defmodule Ps1 do

@ps1 'localhost'

@user 'cires'

@pwd  'cires'

def checkftp() do

IO.puts "checkftp"

:ok=:inets.start

end

def initftp(:ok) do

IO.puts "initftp"

{:ok, pid} = :inets.start(:ftpc, host: @ps1)

pid

end

def userftp(pid) do

IO.puts "userftp"

case :ftp.user(pid, @user, @pwd) do

:ok ->pid

_ -> {:error}

end

end

def chdir pid,_folder do 

IO.inspect :ftp.pwd(pid)

IO.inspect :ftp.cd(pid, "/MEMCARD")

# case :ftp.cd(pid, "/MEMCARD") do

# :ok -> pid

# _ -> :error

# end

end 

IO.puts "starting"

def run do

checkftp

|>initftp

|>userftp

# |>IO.inspect

|>chdir "MEMCARD"

end

end

[Ben Wilson]

Note the use of single quotes in the example you posted first. They aren't the same as double quotes. see: http://elixir-lang.org/getting-started/binaries-strings-and-char-lists.html. Many erlang libraries expect char lists. Check the documentation on the given functions.

[Ben Wilson]

Oh also it's very important to note that "" in erlang are equivalent to '' in elixir. Thus if you see "foo" in erlang you want 'foo' in elixir. Erlang strings are elixir chat lists.