From: Fengfeng Li <lifengfeng@...>
Date: 2010-11-23T12:08:22+09:00
Subject: system() or process.create?

Hi everyone,

I'm a beginer of ruby, I want to know how to call external applications
in ruby, without the cmd window poping up.
I leanrt this link: http://www.ruby-forum.com/topic/213521#new, and
tried all the below ways:
result = `#{cmd}` #I tried this but the window still poped up
result = IO.popen("#{cmd}").read   #and the same with this one
Process.create(
  :app_name => cmd,
  :startup_info=>  {:sw_flags=>Process::SW_HIDE , :startf_flags =>
Process::STARTF_USESHOWWINDOW}                    )
#at last, I use process.create and the black window disappeared.

It worked good when I set cmd as "\"#{winrar_path}\\winrar.exe\" e -y
-o+ -ibck \"#{para[:dst_path]}\\*.zip\" \"#{para[:dst_path]}\\\"", but
when I changed it to "del *.zip", it always said "CreateProcess()
failed: ", as below:

FileUtils.chdir("#{para[:dst_path]}")
cmd = "del *.zip"
Process.create(:app_name => cmd,:startup_info=>
{:sw_flags=>Process::SW_HIDE , :startf_flags =>
Process::STARTF_USESHOWWINDOW} )

The other problem is, if I use Process.create to unzip some file
firstly, and then use Process.create to do some other things to the
new-unzip files secondly, the second application sometimes failed, I
think maybe because the first unzip process is still processing? How to
avoid this? Thanks:)

Regards

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