c# code to generate barcode C ha p t e r 1 7 n U S e F U L r U B Y LI B r a r I e S a N D G e M S in C#

Painting Denso QR Bar Code in C# C ha p t e r 1 7 n U S e F U L r U B Y LI B r a r I e S a N D G e M S

C ha p t e r 1 7 n U S e F U L r U B Y LI B r a r I e S a N D G e M S
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require 'cgi' require 'cgi/session' require 'cgi/session/pstore' cgi = CGI.new session = CGI::Session.new(cgi, :session_key => 'count_app', :database_manager => CGI::Session::PStore, :prefix => 'session_id' ) if session['count'] && session['count'].to_i > 0 session['count'] = (session['count'].to_i + 1).to_s else session['count'] = 1 end cgi.out do "<html><body>You have loaded this page #{session['count']} times</body></html>" end session.close In this example, you perform the same counting operation as with the cookie code, although you could, effectively, store many kilobytes of data alongside each session, such as shopping cart information, binary data, or other forms of metadata such as YAML and XML documents. Notice that the prior code is similar to that used in Ruby on Rails to work with sessions. The session variable acts like a special hash that s created and saved for each unique user. However, unlike in Rails, you use the close method after you ve finished using the session so that any new data is written to disk safely.
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n Note You can test the prior example s effectiveness by loading different web browsers (for example,
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Firefox and Internet Explorer, not different windows of the same browser).
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You can learn more about CGI::Session at http://www.ruby-doc.org/core/classes/CGI/ Session.html, including how to make CGI::Session store session data in different ways (such as in memory or in a plain text format).
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Further Information
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Standard library documentation for cgi: http://www.ruby-doc.org/stdlib/libdoc/cgi/ rdoc/index.html Further information about CGI: http://www.w3.org/CGI/ Further information about HTTP cookies: http://en.wikipedia.org/wiki/HTTP_cookie
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Ch apt er 17 n US eFU L r U B Y L IB r a r IeS a ND G e M S
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chronic
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The chronic library makes it easy to convert dates and times written in almost any format into dates and times that Ruby recognizes correctly internally. It accepts strings such as 'tomorrow' and 'last tuesday 5pm', and turns them into valid Time objects.
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Installation
The chronic library isn t part of the Ruby standard library, but it is available as a RubyGem. To install it, use the typical gem installation process (as covered in 7), like so: gem install chronic or sudo gem install chronic
Examples
chronic is designed to accept dates and times written in a natural language format and to return valid Time objects. Here are some basic examples: require 'chronic' puts Chronic.parse('last tuesday 5am')
Tue Apr 07 05:00:00 +0100 2009
puts Chronic.parse('last tuesday 5:33')
Tue Apr 07 17:33:00 +0100 2009
puts Chronic.parse('last tuesday 05:33')
Tue Apr 07 05:33:00 +0100 2009
puts Chronic.parse('last tuesday lunchtime')
Tue Apr 07 12:00:00 +0100 2009
C ha p t e r 1 7 n U S e F U L r U B Y LI B r a r I e S a N D G e M S
puts Chronic.parse('june 29th at 1am')
Mon Jun 29 01:00:00 +0100 2009
puts Chronic.parse('in 3 years')
Fri Apr 13 02:25:15 +0100 2012
puts Chronic.parse('sep 23 2033')
Fri Sep 23 12:00:00 +0100 2033
puts Chronic.parse('2003-11-10 01:02')
Mon Nov 10 01:02:00 +0000 2003 Chronic.parse will return nil if a date or time isn t recognized.
n Note An extension to the Time class provided by the standard library can also parse times, though at a more preformatted level. See http://stdlib.rubyonrails.org/libdoc/time/rdoc/index.html for information. There s also a library in the standard library called ParseDate that provides a method that converts textually formatted dates into an array of values representing different aspects of the supplied date. You can learn more about ParseDate at http://www.ruby-doc.org/stdlib/libdoc/parsedate/rdoc/ index.html.
Further Information
Documentation for chronic: http://chronic.rubyforge.org/ Chronic screencast: http://www.rubyinside.com/chronic-ruby-date-time-parserscreencast-263.html
Ch apt er 17 n US eFU L r U B Y L IB r a r IeS a ND G e M S
Digest
A digest (more commonly known as a hash though not the same type of hash as you ve used to store data structures in Ruby) is a number or string of data that s generated from another collection of data. Digests are significantly shorter than the original data and act as a form of checksum against the data. Digests are generated in such a way that it s unlikely some other valid data would produce the same value, and that it s difficult, if not impossible, to create valid data that would result in the same hash value. A common use for hashes or digests is to store passwords in a database securely. Rather than store passwords in plain text where they could potentially be seen, you can create a digest of the password that you then compare against when you need to validate that the password is correct. You ll look at an example of this in the Examples section.
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