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The QFileDialog class has a method for asking for a file name when saving files: getSaveFileName. If the file already exists, a warning dialog similar to the one seen in Figure 3-23 displays.

Conceptually, it helpful to think about Pylons applications as having two completely different types of logs: Server logs Application logs Server logs are generated by the server running the Pylons application and will typically include information such as the URL that was requested and the time the request was made. The server might also log information such as the IP address of the user visiting the site. The application logs are generated by your Pylons application and the packages it uses. Application log messages can come from your controllers, model, helpers, templates, or any other part of your application as well as from third-party packages your application uses such as SQLAlchemy or AuthKit. Application log messages are sometimes also sent to the server for logging, and this results in the application log messages being intermingled with the server log messages. As you can imagine, logging can quickly get quite complicated unless you keep the concept of a server log very separate from the concept of an application log in your own mind. To demonstrate the difference between the two types of logs and how they interact in development mode with the Paste HTTP server, let s create a new project called LogTest with a controller named log. Choose Mako as the templating language, and you won t need SQLAlchemy or Google App Engine support: $ paster create --template=pylons LogTest $ cd LogTest $ paster controller log

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If Mallory changes one of the dollar amounts in the IOU each time Alice tries to send it to Bob, and Bob is forced to discard the message each time because of the mismatched dollar amounts, Bob will never receive the IOU he rightly deserves! (Denial-of-service attacks are discussed further in Section 17) Unfortunately, a real-world active eavesdropper will typically have the power to change much more than a single character in a message, and the simple approach of repeating the dollar amount will not work In addition, repeating information more than once requires extra communications bandwidth and is not terribly efficient In networking communications protocols, approaches such as CRCs (cyclic redundancy checks) can be used to achieve integrity and detect when bits in a message have been lost or altered due to inadvertent communications failures.

Figure 3-23. Qt verifies when the user tries to replace an existing file. In Listing 3-13 you can see the source code used for showing the dialog in Figure 3-24. If you compare the listing with the corresponding listing for opening a file, you see that the arguments are identical. When specifying filters, it is good to know that Qt helps to enforce the file extension if not specified by the user. This means that you need to have an All files (*.*) filter to enable the user to pick a file extension freely. Listing 3-13. Qt asks the user for a name for saving a file QString filename = QFileDialog::getSaveFileName( this, tr("Save Document"), QDir::currentPath(), tr("Documents (*.doc)") ); ...

At this point it is worth taking a step back from Pylons to understand what is actually going on to display the Hello from the index() action! message. At its heart, web development is all about the Hypertext Transfer Protocol (HTTP). Any web page you visit that starts with http:// is using HTTP to communicate between the browser and the server. Other protocols are used on the Internet too, such as the File Transfer Protocol (FTP), but for creating data-driven web sites with Pylons, HTTP is the only one you need to understand.

Note If you re new to web development, it is important not to get confused between HTTP and HTML. HTTP is the protocol with which the browser communicates with a server, whereas HTML is a markup language used to create web pages.

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