how to generate barcode in asp.net using c# 2: Chess on the Net: Correspondence Gaming with Deep Green in Objective-C

Generator Denso QR Bar Code in Objective-C 2: Chess on the Net: Correspondence Gaming with Deep Green

CHAPTER 2: Chess on the Net: Correspondence Gaming with Deep Green
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Figure 2-11. Browser output when inviting an opponent
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No harm done yet. Even though we know Garry very, very well, he has no clue about our intentions. But you can now pass parameters to the service, and you re going to use some of the built-in modules to make the code simple and clean. Let s finish the invitation implementation. Once again, you ll take advantage of a couple of the prebuilt modules in the GAE framework. There s a lot of new stuff, all of which I ll explain after the code:
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from from from from google.appengine.ext import webapp google.appengine.ext.webapp.util import run_wsgi_app google.appengine.ext import db google.appengine.api import mail
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class Game (db.Model): inviter = db.StringProperty () invitee = db.StringProperty () created = db.DateTimeProperty (auto_now_add = True) moves = db.StringListProperty () class GameController (webapp.RequestHandler): def post (self): game = Game () game.inviter = self.request.get ('inviter') game.invitee = self.request.get ('invitee') game.put () mail.send_mail (sender = game.inviter, to = game.invitee, subject = "Hey, let s play chess!", body = "Click here: chess://domain.com/game action=accept&email=%s&game=%s" % (game.invitee, str (game.key ())) ) self.redirect ('/games') def get (self): self.response.out.write ('<html><body>') self.response.out.write ('<p>Your games:</p><ul>') games = db.GqlQuery ("SELECT * FROM Game ORDER BY created DESC LIMIT 10")
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CHAPTER 2: Chess on the Net: Correspondence Gaming with Deep Green
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for game in games: self.response.out.write ('<li>%s vs. %s (%s)</li>' % (game.inviter, game.invitee, str (game.key ()))) self.response.out.write ('</ul></body></html>') class EntryForm (webapp.RequestHandler): def get (self): self.response.out.write ("""<html><body> <form action="/game" method="post"> <div>Opponent: <input type="text" name="invitee"/></div> <div>You: <input type="text" name="inviter"/></div> <div><input type="submit" value="Invite!"/></div> </form> </body></html>""") application = webapp.WSGIApplication ([ ('/', EntryForm), ('/games', GameController), ('/game', GameController), ], debug=True) def main (): run_wsgi_app (application) if __name__ == "__main__": main ()
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You re importing two new modules: db and mail for interfacing with the database and for sending e-mails, respectively. There are two new classes: the Game model class, which you re storing to the database (and later will be retrieving), and EntryForm, which is just a temporary class for checking in the browser that the code works. Notice how the application object gets initialized with a list of URLs and corresponding classes. The application now supports three URLs: /, /games, and /game. When a client requests the root, an EntryForm object is being instantiated, serving an HTML form that allows you to enter your friend s and your own e-mail addresses, as shown in Figure 2-12.
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Figure 2-12. The output generated by the EntryForm class
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CHAPTER 2: Chess on the Net: Correspondence Gaming with Deep Green
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Submitting the form sends a POST request to the /game URL with the two e-mail addresses as parameters. This is just a temporary mechanism to let you test the API. Eventually, the client application on the device will send the request. The POST request is being handled by GameController s post() method, which then creates the Game in the data store. That s the first four lines of the method. That s pretty powerful. Notice how you don t have to make an explicit connection with the database or verbose INSERT INTO table VALUES () SQL stuff. You re just creating the Game object, setting its property values, and then using put() to put it in the datastore. The properties of the game are defined in its class declaration. After having created the game in the datastore, you re sending an invitation to the opponent per e-mail. The Game s key is its unique identifier, which you re using for the link so that it can be passed around as a parameter when the user taps the link in the e-mail. This way, the game key will end up as a parameter in your application on the iPhone. Finally, the web service redirects to /games, which causes the get() method of the GameController to be called, and the ten most recent games get listed in reverse chronological order, as shown in Figure 2-13.
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