barcode scanner in .net core

barcode scanner in .net core

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Description Merges elements from two sequences Casts an element of the sequence into a specified type Filters elements of a sequence, returning only those of the specified type Converts the sequence into an array Creates a Dictionary(Of Tkey, Tvalue) from a sequence Creates a List(Of T) from a sequence Creates a Lookup(Of K,T) from a sequence Returns its argument typed as Ienumerable(Of T) Provides a default element for an empty sequence Returns the element at the specified index from a sequence Similar to ElementAt but also returns a default element when the specified index is out of range Returns the first element in a sequence Similar to First but also returns a default element when the first element in the sequence is not available

For the past several chapters, we ve been focusing on what could be considered the back end of Cocoa programming, the model and controller classes that provide functionality to help take care of your application s infrastructure. Now it s time to turn our attention to the front end of Cocoa, and pay more attention to the view part of the MVC architecture. In this chapter, we re going to focus on windows (not the Microsoft kind), menus (not the restaurant kind), and sheets (not the bed kind), all of which are high-level GUI objects that practically no Cocoa application can do without. Windows provide the foundation for view objects to do their drawing. In Cocoa, these are represented by NSWindow, its direct subclass NSPanel, and several specialized subclasses. Menus provide the familiar top-of-the-screen access to system-wide and application-specific user actions that most Mac applications have, and are represented by a hierarchy of NSMenu and NSMenuItem objects. Sheets provide an alternative to the classic free-floating modal window by letting you attach a modal window as an overlay on an existing window, giving the user a more coherent interface. We re going to explore each of these three areas in a lab, a toy application that has no real use, and is only created for demonstrating some functionality and letting you see how these things work.

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When you created the project as a Core Data enabled project, Xcode s template magic should have created a file called OfflineMailer.xcdatamodel. Double-click it, and you should get something that looks like Figure 7-13.

and si.index_id > 1 and si.index_id < 255"

without any help from a visual designer because it can t currently handle templates. Listing 13.4 shows what the final style should look like.

Why doesn t the queue attempt to allocate space for Thread 1 again As long as a single thread accesses the collection, there is no reason to assume that the space allocated would no longer be available. When an unforeseeable situation occurs, the best thing to do is to throw an exception. Additionally, if the Enqueue method contained retry logic, it is possible that something much worse than an exception, such as an infinite loop or thread starvation, could occur. In the next section we see how we can use collections safely in a multithreaded environment. 7.1.2 Making collections thread-safe using Synchronized We ve seen that the Queue class in the Collections namespace is not thread-safe. This is the general rule for collections, with the exceptions of the Hashtable and ArrayList classes. Hashtable is thread-safe for multiple readers and a single writer. Multiple threads can read from the same Hashtable safely as long as no more than one thread is updating it. This is most likely because a reader-writer lock guards the Hashtable s data. In the next chapter we ll discuss reader-writer locks. The ArrayList class is thread-safe for multiple readers. This means that multiple threads can be reading from the same ArrayList as long as no thread attempts to update it. In the last section we saw how the Queue class is not thread-safe. Fortunately it is easy to make a Collection thread-safe. The static/shared Synchronized method of the Collection class returns a collection that is thread-safe.

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