请求Google的服务

# Sample code from Programing Ruby, page 239
require 'soap/wsdlDriver'
以下通过对Google的服务请求，使用Google的一个服务,并使用了WSDL（Web Services Description Language）来完成.(前提是你拥有一个Google Web API的使用账号，并保存在主目录的.goolge_key文件中)
require 'cgi'

WSDL_URL = "http://api.google.com/GoogleSearch.wsdl"

soap = SOAP::WSDLDriverFactory.new(WSDL_URL).createDriver

query = 'pragmatic'
key = File.read(File.join(ENV['HOME'], ".google_key")).chomp

result = soap.doGoogleSearch(key, query, 0, 1, false,
                             nil, false, nil, nil, nil)

printf "Estimated number of results is %d.\n",
       result.estimatedTotalResultsCount

printf "Your query took %6f seconds.\n", result.searchTime
first = result.resultElements[0]
puts first.title
puts first.URL
puts CGI.unescapeHTML(first.snippet)