.net upc-a reader

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AcceptChanges() is actually the simplest of the three methods. If changes are being accepted, it means that the current values in the object are the ones that should be kept, and the most recent snapshot is now meaningless and can be discarded. Like CopyState(), once this method is complete, a virtual AcceptChangesComplete() method is called to allow subclasses to take additional actions. In concept, this means that all AcceptChanges() needs to do is discard the most recent snapshot: _stateStack.Pop(); However, it is important to remember that the object may have child objects, and they need to know to accept changes as well. This requires looping through the object s fields to find any child objects that implement IUndoableObject. The AcceptChanges() method call must be cascaded to them, too. The process of looping through the fields of the object is the same as in CopyState() and UndoChanges(). The only difference is where the method call is cascaded:

Lifetime Starts when the instance is created. Ends when the instance is no longer accessible. Initialized to a default value for the type.

Figure 3-3. The New Project dialog in Visual C++ 2008 Express Edition, showing the available C++/CLI project types

Sometimes, your iPod touch won t respond to your touch it freezes in the middle of a program. If this happens, try these steps to see whether the iPod touch will start responding (see Figure 28 1): 1. Click the Home button once to see whether that exits the app to the Home screen. If one particular app is causing trouble, try double-clicking the Home button to open the App Switcher bar. Then press and hold any icon in the App Switcher bar until they all shake and a red circle with a minus sign appears in the upper-left corner of the

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Compile the project Open Workflow1.xaml and in the Toolbox (Project section) you will now find the new SaveBooking activity should now be available. Drag it onto the Sequence activity just beneath the "Check availability" activity. On the properties of the "Save Booking" activity, set the BookingReference argument to use the BookingReference variable defined in the main workflow. Run your workflow. You should now see the output Save booking and whatever you have set the booking reference variable to.

Figure 4-1. Use case for example ASP.NET application In Figure 4-1, the actor is a user who has to perform four steps: search Amazon.com, filter the results on a price band, filter the resulting results based on user reviews, and then output the final results. Notice in the use case diagram how the individual use cases are sequential and operate on the results of the previous use case. This is a very common and essential attribute of the Pipes and Filters pattern. Even though the example doesn t illustrate the addition of other streams, it s also part of the pattern. If the data isn t processed using those attributes, then the Pipes and Filters pattern might not be suitable. The advantage of the Pipes and Filters pattern is its ability to substitute and modify the sequence of events used to process a data set. For example, to search eBay for a television isn t difficult it only requires adding an additional use case before the filtering is started. The strength

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