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Each layer of the stack, you see, uses the tools provided by the layer beneath it, and in turn offers capabilities to the next higher layer A second point made clear through these examples is how very complete the Python support is for every one of the network levels at which we have just operated Only when using a vendor-specific protocol, and needing to format requests so that Google would understand them, did we even have to resort to using a third-party library Every single one of the other protocol levels we encountered already had strong support inside the Python Standard Library Whether we wanted to fetch the document at a particular URL, or send and receive strings on a raw network socket, Python was ready with functions and classes that we could use to get the job done.

The connection from copyAvailable to setEnabled is an example of how to enable and disable actions As soon as something is.

Third, note that my programs decreased considerably in quality as I forced myself to use increasingly lower-level protocols The search2py and search3py listings, for example, started to hardcode things like the form structure and hostnames in a way that is very inflexible and might be rather hard to maintain later The code in search4py is even worse: it includes a handwritten, completely unparameterized HTTP request whose structure is completely opaque to Python; and, of course, it contains none of the actual logic that would be necessary to parse and interpret the HTTP response and understand any network error conditions that might occur This illustrates a lesson that you should remember through every subsequent chapter of this book: that implementing network protocols correctly is difficult, and that you should use the Standard Library or third-party libraries whenever you possibly can.

selected, copyAvailable is emitted with true as the argument. When no selection is available, the argument is false. So the action is enabled when applicable and disabled at all other times. The last action is the aboutQtAction, which is connected to the qApp object. The application object manages application global tasks such as closing all windows and showing a dialog with information about the Qt version being used.

Each gadget has configuration options available in the upper left corner of its window. Click the gadget s wrench icon to display an About dialog box for your mashup, shown in Figure 6-17, that has two links: Customize this: This link takes you to Popfly, and if you have an account and are logged in, opens the blocks used to create the gadget in the mashup editor. I want this: This link opens the creator s Popfly page and shows the mashup information for it. Click OK or Cancel to close the window.

Note The global qApp pointer variable is always set to point to the active QApplication object. To get access to this pointer, you must not forget to include the <QApplication> header file in the files where you use it.

Especially when you are writing a network client, you will always find yourself tempted to oversimplify your code; you will tend to ignore many error conditions that might arise, to prepare for only the most likely responses, and, in general, to write very brittle code that knows as little about the service it is talking to as is technically possible By instead using a third-party library that has developed a very thorough implementation of a protocol, because it has had to support many different Python developers who are using the library for a variety of tasks, you will benefit from all of the edge cases and awkward corners that the library implementer has already discovered and learned how to work around Fourth, it needs to be emphasized that higher-level network protocols like the Google Maps protocol for resolving a street address generally work by hiding the network layers beneath them.

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