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qDebug() << "Cannot load library."; return 0; } SumFunction sum = (SumFunction)library.resolve( "sum" ); if( sum ) qDebug() << "sum of 'Qt Rocks!' = " << sum( 9, "Qt Rocks!" ); return 0; } What are the main differences between using QLibrary and letting Qt help you with the plugins For starters, QPluginLoader ensures that the plugin will work with the Qt application by seeing that the plugin has been built using the right tools on the right platform. The QPluginLoader also gives you access to a class instance instead of a set of C symbols that you can use to create that class instance. On the other hand, QLibrary enables you to use plugins built without Qt. You can also adapt your Qt application to older, non-Qt specifications. When you must use QLibrary, I recommend that you hide the code in a single class. That way you can contain the complexities in that class and keep the object-orientated Qt style throughout the rest of your application.

An HTML-capable mail reader will choose the second view, and give the user a fancy representation of the message with the word great in bold and Anonymous in italics. A text-only reader will instead choose the first view, and the user will still at least see a readable message instead of one filled with angle brackets.

Summary

Although you have seen how MIME can encode message body parts with base-64 to allow 8-bit data to pass through, that does not solve the problem of special characters in headers. For instance, if your name was Michael M ller (with an umlaut over the u ), you would have trouble representing your name accurately in your own alphabet. The u would come out bare. Therefore, MIME provides a way to encode data in headers. Take a look at Listing 12 12 for how to do it in Python. Listing 12 12. Using a Character Encoding for a Header #!/usr/bin/env python # Foundations of Python Network Programming - 12 - mime_headers.py # This program requires Python 2.5 or above from email.mime.text import MIMEText from email.header import Header message = """Hello, This is a test message from 12. -- Anonymous""" msg = MIMEText(message) msg['To'] = 'recipient@example.com' fromhdr = Header() I hope you enjoy it!

Popfly s functionality with Popfly Blocks. There are dozens of books that can give you a deeper insight into it. I have listed some here: Beginning JavaScript with DOM Scripting and Ajax: From Novice to Professional by Christian Heilmann (Apress, 2006) Practical JavaScript, DOM Scripting, and Ajax Projects by Frank Zammetti (Apress, 2007) Pro JavaScript Techniques by John Resig (Apress, 2006)

Qt makes handling plugins easy. It is possible to extend Qt to handle custom database drivers, image formats, and even window decoration styles by inheriting and implementing an interface class. You can also extend your own applications with plugins, either by letting Qt handle the plugin interface or through a low-level interface. If you need to interface plugins made for other applications or defined according to a standard, you can use the QLibrary class for a low-level access to DLLs. This class makes it possible to interface almost any code. It is easier to let Qt handle the plugins through the QPluginLoader class in combination with the Q_DECLARE_INTERFACE, Q_EXPORT_PLUGIN, and Q_INTERFACES macros and the QObject class. When creating new plugin interfaces, it is important to build interfaces that last. Try to make the interfaces as generic as possible and try to make them act as factories. Being able to put several plugins in one can greatly simplify deployment. If you plan to use plugins in your application, you can use the same interface for the plugins as for your internal functionalities. Simply turn the base functionality that you want to be a part of the application into a statically linked plugin. In this way you have only one interface to worry about from your application s viewpoint and you can still put functionality in your executable file.

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