When writing the first few Ruby programs, there is a tend to place all the code in a single file. But as time passes by and the Ruby programs grow, it is nature that at some point we have to break our code up into logical groupings and place each group in a separate file or files.
following is an examle:
in foo.rb:
puts “it is foo”
$foo = 3 # $ for global variable
in bar.rb:
puts “it is bar”
$bar = 3 # $ for global variable
in test.rb:
require ‘foo’ # pay attention –no “.rb”
load ‘bar.rb’ # pay attention — “.rb” is there
test = 1 + $foo + $bar
when execute test.rb, it shows :
it is foo
it is bar
9
At first, I failed to find which weekday is today by following codes:
timetoday = Time.now
if timetoday =~ /Fri/
puts “Friday”
end
I found in the internet that following codes works:
timetoday = ” ”
timetoday = Time.now.to_s()
if timetoday =~ /Fri/
puts “Friday”
end
I encountered a error 14001 when I tried to install watir 1.6.2 in a new computor, I googled and found:
the version of win32-api should be 1.3.0 or later
the version of windows-api should be 0.3.0 or later
the version of windows-pr should be 0.9.9 or later
After fix the above version problems, the watir can work properly.
Hpricot vs Mechanize vs ScrAPI vs Watir vs ScRUBYt!
For autoposting and scraping, at first I got familiar with watir, and then I learned somthing about Hpricot, now I am concentrated on Mechanize.
I think all of the tools stated above are quite good.
Related Blogs
It is difficult to find the examples demonstrating how to combine two conditions in the if statement of ruby, I tried and found following code is ok:
tmp = rand(10)
if ((tmp > 5) && (ie77.text.include? ‘fine’))
puts “fine”
else
sleep 7
end
Following code is trying to scrape the content in a webpage, the content cannot be picked by the scraping software tool I used:
require ‘rubygems’
require ‘hpricot’
require ‘open-uri’
url = “http://homemsg.focus.cn/msgview/607/50129006.html”
doc = Hpricot(open(url))
td_contents = (doc/”/html/body/table[8]/tbody/tr/td[4]/table[2]/tbody/tr/td”).inner_html
puts td_contents
It did not work, there must be something wrong.
by firebug, I can copy the xpath(/html/body/table[8]/tbody/tr/td[4]/table[2]/tbody/tr/td), and copy its innerHTML.
