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Looking back at Listing 4-1 you can see that after the call to createActions, the next steps are the createMenus and createToolbars methods. These methods take the newly created actions and put them in the right places. Listing 4-3 shows how the File menu and the file operation s toolbar are populated with actions. Because each action already has a text and icon, all it takes is a call to addAction(QAction*) for the text and icon to appear in the menu. The menuBar() and addToolBar(const QString&) calls are a part of the main window class. The first time menuBar is called, a menu bar is created. Later calls will refer to this menu bar because each window has only one menu. Toolbars are created using the addToolBar method, and you can create any number of toolbars for each window. Using the addSeparator() method, you can divide the actions into groups, which can be used in both menus and toolbars. Listing 4-3. The menus and toolbars are populated. void SdiWindow::createMenus() { QMenu *menu; menu = menuBar()->addMenu( tr("&File") ); menu->addAction( newAction ); menu->addAction( closeAction ); menu->addSeparator(); menu->addAction( exitAction ); ... } void SdiWindow::createToolbars() { QToolBar *toolbar;

If you re using the googlemaps library, you might not even be aware that URLs and HTTP are the lowerlevel mechanisms that are being used to construct and answer your queries! An interesting question, whose answer varies depending on how carefully a Python library has been written, is whether errors at those lower levels are correctly hidden by the library Could a network error that makes Google temporarily unreachable from your site raise a raw, low-level networking exception in the middle of code that s just trying to find the coordinates of a street address We will pay careful.

toolbar = addToolBar( tr("File") ); toolbar->addAction( newAction ); ... } Refer to Listing 4-1 again you will see that after the actions have been added to the menus and toolbars, the final call in the constructor creates a status bar and displays the message "Done" in it. The statusBar() method works just like menuBar(): the bar is created and returned at the first call and then a pointer to it is returned in subsequent calls.

Note that some encodings have the property that every character they are able to encode will be represented by the same number of bytes; ASCII uses one byte for every character, for example, and UTF-32 uses four. If you use one of these encodings, then you can both determine the number of characters in a string by a simple examination of the number of bytes it contains, and jump to character n of the string very efficiently. (Note that UTF-16 does not have this property, since it uses 16 bits for some characters and 32 bits for others.) Some encodings also add prefix characters that are not part of the string, but help the decoder detect the byte ordering that was used (byte order is discussed in the next section) thus the \xff\xfe prefix that Python's UTF-16 encoder added to the beginning of our string. Read the codecs package documentation and, if necessary, the specifications for particular encodings to learn more about the actions they perform when turning your stream of symbols into bytes. Note that it is dangerous to decode a partially received message if you are using an encoding that encodes some characters using multiple bytes, since one of those characters might have been split between the part of the message that you have already received and the packets that have not yet arrived. See the section later in this chapter on Framing for some approaches to this issue.

You can also see your gadget along with other installed gadgets by right-clicking the Windows Sidebar and selecting the Add Gadget menu item to display a gallery of installed gadgets on your computer (see Figure 6-18).

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