From: sundar sundar <lists@...>
Date: 2013-04-02T10:26:56+09:00
Subject: Re: How to quote variable of an array

Joel Pearson wrote in post #1103948:
> If you "p" (inspect) a string, then you'll get quotes because that's how
> they're represented.
>
> If you use Jesus' method, you can add whatever you want around the
> string.
>
> Bear in mind though, that the representation of Fixnum 1 is 1, and
> String 1 is "1". If you manually add quotes you might end up
> misrepresenting the type of object you're using.

Thank you. The problem is not solved. The above example does not work
when i implement it to the real code . Here is the actual code. I am
trying to find usb details using dbus (ruby-dbus gem).

#!/usr/bin/env ruby

require 'rubygems'
require 'dbus'

bus = DBus::SystemBus.instance
udisk_service = bus.service("org.freedesktop.UDisks")
udisk_udisk = udisk_service.object("/org/freedesktop/UDisks")
udisk_udisk.introspect
udisk_udisk.default_iface = "org.freedesktop.UDisks"
disk_list = [udisk_udisk.EnumerateDevices]

disk_list.each { |disk|
#puts %Q{"#{disk}"}
puts disk
udisk_udisk = udisk_service.object("#{disk}")
udisk_udisk.introspect
udisk_udisk_i = udisk_udisk["org.freedesktop.UDisks.Device"]
puts udisk_udisk_i["IdUuid"]
}

disk_list is array of available disks attached to system. When i use
"put disk" in the loop i list all the disk with out problem. Like this
/org/freedesktop/UDisks/devices/sr0
/org/freedesktop/UDisks/devices/sdc
/org/freedesktop/UDisks/devices/sdb
/org/freedesktop/UDisks/devices/sda
/org/freedesktop/UDisks/devices/sda1
/org/freedesktop/UDisks/devices/sda2
/org/freedesktop/UDisks/devices/sda3
/org/freedesktop/UDisks/devices/sdc1
/org/freedesktop/UDisks/devices/sda5
/org/freedesktop/UDisks/devices/sda6
/org/freedesktop/UDisks/devices/sdb1
/org/freedesktop/UDisks/devices/sda7
/org/freedesktop/UDisks/devices/sda8

But when i quote with either "puts %Q{"#{disk}"}" or "p disk.to_s" then
the output becomes
"/org/freedesktop/UDisks/devices/sr0/org/freedesktop/UDisks/devices/sdc/org/freedesktop/UDisks/devices/sdb/org/freedesktop/UDisks/devices/sda/org/freedesktop/UDisks/devices/sda1/org/freedesktop/UDisks/devices/sda2/org/freedesktop/UDisks/devices/sda3/org/freedesktop/UDisks/devices/sdc1/org/freedesktop/UDisks/devices/sda5/org/freedesktop/UDisks/devices/sda6/org/freedesktop/UDisks/devices/sdb1/org/freedesktop/UDisks/devices/sda7/org/freedesktop/UDisks/devices/sda8"

What i want is that to list available disk with quote like this

"/org/freedesktop/UDisks/devices/sr0"
"/org/freedesktop/UDisks/devices/sdc"
"/org/freedesktop/UDisks/devices/sdb"
.
.
.
"/org/freedesktop/UDisks/devices/sda8"

so that the line "udisk_udisk = udisk_service.object("#{disk}")" takes
disk one by one.

When i provide disk_list data manually with

["/org/freedesktop/UDisks/devices/sr0",
"/org/freedesktop/UDisks/devices/sdc","/org/freedesktop/UDisks/devices/sdb",
..., "/org/freedesktop/UDisks/devices/sda8"]

and execute looping then it works.

Any help is appriciated.

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