Problem with .each do


#1

Hiya. The book does things this way, so why doesn’t it work for me?
What’s going on?

def fromWeb(site, url)
# get data from website
h = Net::HTTP.new(site, 80)
resp, data=h.get(url, nil)

# process data
data.each do <- point of second error
	|line|
	if /DGM_navigation/ =~ line do
		# decode page lineage
		step=Array.new
		astep, line = getNextWord(line)
		while astep != nil
			step.push(astep)
			astep, line = getNextWord(line)
		end
		puts "Page Lineage"
		step.each do
			|astep|
			step.each do
				put " "
			end
			puts astep
		end
	end # end DGM_naviation
end # end data.each <- gets "undefined method 'line'", from the second

error point above
end # end def fromWeb

def getNextWord(line)
i1 = />\w+</ =~ line

string_wanted=$&[1..$&.length-1]
string_remaining=$'
return string_wanted, string_remaining

end


#2

Lady Michelle B. removed_email_address@domain.invalid writes:

  |line|
          [ ... etc. ... ]

end # end data.each <- gets “undefined method ‘line’”, from the second

It turns out that Net::Http#get no longer returns a pair of values. It
has changed between ruby version 1.6 (from the edition of the book that
you probably have) and 1.8. This is explained in the method’s latest
documentation (from
http://www.ruby-doc.org/stdlib/libdoc/net/http/rdoc/index.html):

get(path, initheader = nil, dest = nil) {|+body_segment+| …}

Gets data from path on the connected-to host. header must be a Hash
like { ‘Accept’ => ‘/’, … }.

In version 1.1 (ruby 1.6), this method returns a pair of objects, a
Net::HTTPResponse object and the entity body string. In version 1.2
(ruby 1.8), this method returns a Net::HTTPResponse object.

If called with a block, yields each fragment of the entity body in
turn as a string as it is read from the socket. Note that in this
case, the returned response object will not contain a (meaningful)
body.

dest argument is obsolete. It still works but you must not use it.

In version 1.1, this method might raise an exception for 3xx
(redirect). In this case you can get a HTTPResponse object by
“anException.response”.

In version 1.2, this method never raises exception.

# version 1.1 (bundled with Ruby 1.6)
response, body = http.get('/index.html')

# version 1.2 (bundled with Ruby 1.8 or later)
response = http.get('/index.html')

# using block
File.open('result.txt', 'w') {|f|
  http.get('/~foo/') do |str|
    f.write str
  end
}

See also Net::HTTPResponse within that same documentation.


#3

Lady Michelle B. wrote:

    |line|

Try `data.each do |line|’. It may be the line break that’s causing
trouble.

            |astep|

Same here.

def getNextWord(line)
i1 = />\w+</ =~ line

string_wanted=$&[1..$&.length-1]
string_remaining=$'
return string_wanted, string_remaining

end

Cheers,
Daniel


#4

Sorry, it actually seems to work even with the line break. My bad.

Cheers,
Daniel