From: Daniel Berger <djberg96@...>
Date: 2008-05-06T09:47:28+09:00
Subject: Re: Win32 Service Problem



On May 5, 6:24 pm, "Glen Holcomb" <damnbig...@gmail.com> wrote:
> I'm having an issue with Win32 Service
>
> I have a simple script that I want to run as a service however the service
> won't start (timeout issue).  I've tried several things but nothing I do
> seems to make any difference at all.
>
> Here is the code:
>
> begin
>   require 'rubygems'
>   require 'win32/service'
>   require 'chronic'
>
>   include Win32
>
>   class Daemon
>     def service_init
>       test_log = File.new("path_to_where_it_goes", "w")
>       test_log.puts "got to init"
>       test_log.close
>     end
>
>     def service_main
>       while running?
>         if Time.now < Chronic.parse('today 10:00pm')
>           sleep(Chronic.parse('today 10:00pm') - Time.now)
>           `shutdown /s /t:60`
>         else
>           sleep(Chronic.parse('tomorrow 10:00pm') - Time.now)
>           `shutdown /s /t:60`
>         end
>       end
>     end
>   end
> rescue Exception
>   logfile = File.new("path_to_logfile", "w")
>   logfile.puts $!
>   logfile.close
> end
>
> Daemon.mainloop
>
> I get absolutely no feedback from the script it's self.  In the even log it
> says the service didn't respond within 30 seconds.  Oddly enough it decides
> this after a second or two.  I've tried the script with different code in
> the service_init method and without a service_init method it doesn't seem to
> make any difference.
>
> I realize this would be easier with a task but for reasons beyond my control
> the task scheduler is turned off on all classroom and lab computers.

There's no shell associated with a service, so doing backticks or
system commands in a service is a Bad Idea. Also, as of version 0.6.0
STDIN, STDOUT and STDERR are redirected to NUL by default, so you'll
have to reopen STDERR to a log file if you want to see the full output
(what you saw there happened before they were redirected).

My recommendation is not to use backticks but to use WMI +
Win32_OperatingSystem via OLE. You can find details at:

http://msdn.microsoft.com/en-us/library/aa394239(VS.85).aspx

Regards,

Dan