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comp.lang.ruby

process xml in a page

sig_UVA

7/18/2006 1:31:00 AM

Hi all,

I would like to process the xml in the url below, but I am unsure how.
I've always had APIs to help me out before, so this is new.

http://clinicaltrials.gov/show/NCT00001372?displ...

I want to get this xml in an object that I can then parse and extract
the portions I need.

Thank you for your help, as always.


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5 Answers

James Britt

7/18/2006 2:40:00 AM

0

Hunter Walker wrote:
> Hi all,
>
> I would like to process the xml in the url below, but I am unsure how.
> I've always had APIs to help me out before, so this is new.
>
> http://clinicaltrials.gov/show/NCT00001372?displ...
>
> I want to get this xml in an object that I can then parse and extract
> the portions I need.
>
> Thank you for your help, as always.

Use open-uri to fetch the XML, then load it into a REXML::Document object.

Then use REXML's XPath to grab what you need.

http://www.ru.../stdlib/libdoc/open...
http://www.ru.../stdlib/libdoc/rexml/rdoc/...



--
James Britt

http://www.ru... - Ruby Help & Documentation
http://www.artima.c... - The Journal By & For Rubyists
http://www.rub... - The Ruby Store for Ruby Stuff
http://www.jame... - Playing with Better Toys
http://www.30seco... - Building Better Tools

sig_UVA

7/18/2006 10:57:00 PM

0

Thank you, James. I got a step further, but still need help.

This code outputs exactly what I want to see to the debug window:

require 'open-uri'
require "rexml/document"
include REXML


url = "http://clinicaltrials.gov/show/NCT00001372?displayxml=...

open(url) { |page| print page.read() }



However, I am having trouble when using the REXML tutorial. Should I
somehow save the output to an .xml file locally? Or should I add the
output to a string? I am not sure how to do either as I am having
trouble directing the "print" output anywhere.


Thank you and sorry for the noobness. The api I used in a ruby project
before made everything a bit too easy, so I am still learning.

-Hunter

James Britt wrote:
> Hunter Walker wrote:
>> Thank you for your help, as always.
> Use open-uri to fetch the XML, then load it into a REXML::Document
> object.
>
> Then use REXML's XPath to grab what you need.
>
> http://www.ru.../stdlib/libdoc/open...
> http://www.ru.../stdlib/libdoc/rexml/rdoc/...
>
>
>
> --
> James Britt
>
> http://www.ru... - Ruby Help & Documentation
> http://www.artima.c... - The Journal By & For Rubyists
> http://www.rub... - The Ruby Store for Ruby Stuff
> http://www.jame... - Playing with Better Toys
> http://www.30seco... - Building Better Tools


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James Britt

7/18/2006 11:05:00 PM

0

Hunter Walker wrote:
> Thank you, James. I got a step further, but still need help.
>
> This code outputs exactly what I want to see to the debug window:
>
> require 'open-uri'
> require "rexml/document"
> include REXML
>
>
> url = "http://clinicaltrials.gov/show/NCT00001372?displayxml=...
>
> open(url) { |page| print page.read() }

require 'open-uri'
require "rexml/document"
include REXML


url = "http://clinicaltrials.gov/show/NCT00001372?displayxml=...

xml = open(url).read
p xml

doc = REXML::Document.new(xml)

p doc.root.name


--
James Britt

"I never dispute another person's delusions, just their facts."
- Len Bullard

sig_UVA

7/18/2006 11:21:00 PM

0

I get the error below after a successful XML output to the debug window.
Thanks!

No such file to load -- rexml/encodings/ASCII.rb
No decoder found for encoding ASCII. Please install iconv.
c:/ruby/lib/ruby/1.8/rexml/encoding.rb:33:in `encoding='
c:/ruby/lib/ruby/1.8/rexml/source.rb:40:in `encoding='
c:/ruby/lib/ruby/1.8/rexml/parsers/baseparser.rb:202:in `pull'
c:/ruby/lib/ruby/1.8/rexml/parsers/treeparser.rb:21:in `parse'
c:/ruby/lib/ruby/1.8/rexml/document.rb:176:in `build'
c:/ruby/lib/ruby/1.8/rexml/document.rb:45:in `initialize'
C:/Documents and Settings/hwalker/Desktop/Ruby-1.rb:13:in `new'
C:/Documents and Settings/hwalker/Desktop/Ruby-1.rb:13

c:/ruby/lib/ruby/1.8/rexml/encoding.rb:33:in `encoding=': No decoder
found for encoding ASCII. Please install iconv. (Exception)
from c:/ruby/lib/ruby/1.8/rexml/source.rb:40:in `encoding='
from c:/ruby/lib/ruby/1.8/rexml/parsers/baseparser.rb:202:in `pull'
from c:/ruby/lib/ruby/1.8/rexml/parsers/treeparser.rb:21:in `parse'
from c:/ruby/lib/ruby/1.8/rexml/document.rb:176:in `build'
from c:/ruby/lib/ruby/1.8/rexml/document.rb:45:in `initialize'
from C:/Documents and Settings/hwalker/Desktop/Ruby-1.rb:13:in `new'
from C:/Documents and Settings/hwalker/Desktop/Ruby-1.rb:13


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sig_UVA

7/18/2006 11:42:00 PM

0

A guy in the comments on the page below had the same problem. Someone
supplied a fix for windows (2nd link). It'as all good after that.

http://redhanded.hobix.com/inspect/noXpathOnMessyHtmlIsJustAsEasyI...

http://www.dave.burt.id.au/ruby...


Thanks again, James!

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