[erlang-questions] Why application:start can not accept any args?

[Nuku Ameyibor]

u can add environmental variables for your application in  your .app file  .
there is a tuple with a key env which u can use to add environmental
variables to your application which you can then access from your
application
eg .
{application, test,
 [{vsn, "1.0.0"},
  {description, "testing"},
  {modules, [test, test_sup,test_start]},
  {applications, [stdlib, kernel, crypto]},
  {registered, [test,test_sup]},
  {mod, {test, []}},
  {env,
[
{env1,b},
{env2,a},
{env3,c}
]
}
 ]}.

you can access them like so
{ok, Env} = application:get_env(env1), etc..

there is also a set_env/3 ,set_env/4 which can be used to change
environmental variables during run-time


On Sun, Jul 12, 2015 at 1:19 PM, Lihe Wang <wanglihe.programmer@REDACTED>
wrote:

> Can any one give the explain about OTP? The application behaviour's call
> back "start" need args, but when I want start my code as a real
> application, I only can write "applicaion:start(mycode)", and can not pass
> any args to mycode. Why otp design like this? When I want start a
> application as background service from escript, for example:
>
> main([Arg1, Arg2, Arg3]) ->
>     application:start(mycode1), %%with Arg1
>     application:start(mycode2),  %%with Arg2
>     workcode(Arg3). %%workcode (escript) will run as a daemon, and need
> service supplied by mycode1 and mycode2.
>
> What is the right way to write these code?
>
>
>
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>
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