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The image data is calculated by converting the red, green, and blue values of each pixel to an average gray scale value The value is then shifted down and masked to three bits, giving the value range 0 7 This value corresponds to the darkness of each pixel and is used to look up a character in the map string The map variable is a char* initialized to :ilNAM (including an initial space) The characters in the map string have been picked so that the lowest value is white, and each character gets darker and darker as the index increases The source image and the resulting ASCII art can be seen in Figure 11-3 The ASCII art is shown in a word processor using a monospace font set to a very small size.

Digital signatures can also be used to sign electronic mail, as in the Pretty Good Privacy (PGP) system developed by Phil Zimmerman. However, requiring every user to purchase a certificate from a CA (or even RA) could be quite costly. Instead, PGP allows for a web of trust model in which users sign their own certificates, and users sign each other s certificates to establish trust. If you receive an e-mail that is signed by someone you do not know, if the two of you can find a certificate chain to someone that you may know in common, then you may be able to have some level of trust when verifying each other s signatures. However, in general, trust is not a transitive property, and the longer the chain, the less you may be able to trust the validity of the signature.

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You ve learned about SQLAlchemy sessions in some detail in 7, but now let s take a brief look at how sessions are used in Pylons. The relevant lines to set up the session are found in your model/__init__.py file s init_model() function and look like this: sm = orm.sessionmaker(autoflush=True, autocommit=False, bind=engine) meta.engine = engine meta.Session = orm.scoped_session(sm) The meta.Session class created here acts as a thread-safe wrapper around ordinary SQLAlchemy session objects so that data from one Pylons request doesn t get mixed up with data from other requests in a multithreaded environment. Calling meta.Session() returns the thread s actual session object, but you wouldn t normally need to access it in this way because when you call the class s meta.Session.query() method, it will automatically return a query object from the correct hidden session object. You can then use the query object as normal to fetch data from the database. Since a new session is created for each request, it is important that sessions that are no longer needed are removed. Because you chose to use a SQLAlchemy setup when you created the project, Pylons has added a line to remove any SQLAlchemy session at the end of the BaseController class s __call__() method: meta.Session.remove() This simply removes the session once your controller has returned the data for the response.

When all image data is written to the stream, the stream s good status is ensured before true is returned for a successful write operation Listing 11-7 Writing the image to a device bool TextImageHandler::write( const QImage &image ) { QTextStream stream( device() ); stream << "TEXT\n"; stream << imagewidth() << "x" << imageheight() << "\n"; for( int y=0; y<imageheight(); ++y ) { for( int x=0; x<imagewidth(); ++x ) { QRgb rgb = imagepixel( x, y ); int r = rgb & 0xff; int g = (rgb >> 8) & 0xff; int b = (rgb >> 16) & 0xff; stream << map[ 7 - (((r+g+b)/3)>>5) & 0x7 ]; } stream << "\n"; } if( stream.

To quickly recap, you ve set up the model, configured the database engine, set up the templates, and written an action to view pages based on their IDs. Next, you need to write the application logic and create the forms to enable a user to create, list, add, edit, and delete pages. You ll need the following actions: view(self, id): Displays a page new(self): Displays a form to create a new page

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