Question

我尝试使用Mechanize获取远程XML文件以获取icecast状态信息。但是我在将Mechanize::File格式的XML文件传递给字符串或XMLSimple可以使用的某种XML格式时遇到了问题。

XML文档看起来像这样：

<icestats>
  <admin>donschoe@stackoverflow.com</admin>
  <!-- ... -->
</icestats>

我的代码现在看起来像这样：

require 'mechanize'
require 'xmlsimple'

server = 'example.net'
port = 8000
user = 'stackoverflow'
password = 'hackme'
agent = Mechanize.new
agent.user_agent_alias = 'Linux Firefox'
agent.add_auth("http://#{server}:#{port}/admin/status.xml", user, password)
agent.get("http://#{server}:#{port}/admin/status.xml")
xml = agent.current_page
status = XmlSimple.xml_in(xml)
puts status['admin']

这应输出：donschoe@stackoverflow.com

但它抛出：

/home/user/.gem/ruby/1.9.1/gems/xml-simple-1.1.2/lib/xmlsimple.rb:191:in 'xml_in': Could not parse object of type: <Mechanize::File>. (ArgumentError)

现在，我理解XMLSimple需要一个字符串，因此我尝试将Mechanize::File格式转换为字符串，将第二行替换为：

status = XmlSimple.xml_in(xml.to_s)

但这引发了一个更奇怪的例外：

/usr/lib64/ruby/1.9.1/rexml/parsers/baseparser.rb:406:in `block in pull_event': Undefined prefix Mechanize: found (REXML::UndefinedNamespaceException)
  from /usr/lib64/ruby/1.9.1/set.rb:222:in `block in each'
  from /usr/lib64/ruby/1.9.1/set.rb:222:in `each_key'
  from /usr/lib64/ruby/1.9.1/set.rb:222:in `each'
  from /usr/lib64/ruby/1.9.1/rexml/parsers/baseparser.rb:404:in `pull_event'
  from /usr/lib64/ruby/1.9.1/rexml/parsers/baseparser.rb:183:in `pull'
  from /usr/lib64/ruby/1.9.1/rexml/parsers/treeparser.rb:22:in `parse'
  from /usr/lib64/ruby/1.9.1/rexml/document.rb:231:in `build'
  from /usr/lib64/ruby/1.9.1/rexml/document.rb:43:in `initialize'
  from /home/user/.gem/ruby/1.9.1/gems/xml-simple-1.1.2/lib/xmlsimple.rb:965:in `new'
  from /home/user/.gem/ruby/1.9.1/gems/xml-simple-1.1.2/lib/xmlsimple.rb:965:in `parse'
  from /home/user/.gem/ruby/1.9.1/gems/xml-simple-1.1.2/lib/xmlsimple.rb:164:in `xml_in'
  from /home/user/.gem/ruby/1.9.1/gems/xml-simple-1.1.2/lib/xmlsimple.rb:203:in `xml_in'
  from debugging.rb:16:in `<main>'

我的方法有什么问题？当我下载XML文件并使用本地XML文件时，上面的代码可以正常工作。

我特别在寻找使用Mechanize而不是Nokogiri的解决方案。

Answer 1

尝试更改：

xml = agent.current_page

为：

xml = agent.current_page.body

如何在ruby中使用Mechanize和XMLSimple解析XML？

1 个答案: