asp.net pdf 417 reader

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ll data is not text. Binary data is used in all kinds of applications. Often, accessing binary data is faster than text data, and it is space-efficient, too. Until now we have not talked about what you need to do differently to process binary data in OCaml. This is actually for two reasons. The first is that many programmers and programs are often concerned with text instead of binary data. Text and other human-readable formats are the easiest way to electronically communicate information to people. The second reason, and most important, is because there is no difference. When dealing with binary files, a lot of information is presented in hexadecimal. If you are not familiar with hex, it can take awhile to get used to using a base 16 representation. Hex is base 16, which is different from normal decimal numbers that are base 10. These numbers are displayed using A F (or a f ) for the extra numbers. For example, in decimal notation, 10 is 10. In hex, 10 is 16. But don t worry: OCaml can help you with this. You just prefix numbers with 0x, and the OCaml interpreter will understand these are hex numbers and convert them. You can even perform calculations on hex numbers. 0x10;; : int = 16 0x10 + 10;; : int = 26

Views are user interface (UI) elements that form the basic building blocks of a user interface. Views are hierarchical and they know how to draw themselves. A view could be a button or a label or a text field, or lots of other UI elements. If you re familiar with views in J2EE and Swing then you ll understand views in Android.

When a user clicks that icon, the system takes the URI and uses it to call the content provider The content provider returns a collection of rows through a cursor..

An activity is a user interface concept. An activity usually represents a single screen in your application. It generally contains one or more views, but it doesn t have to. Moreover, other concepts in Android could better represent a viewless activity (as you ll see in the Service section shortly).

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An intent generically defines an intention to do some work. Intents encapsulate several concepts, so the best approach to understanding them is to see examples of their use. You can use intents to perform the following tasks: Broadcast a message Start a service Launch an activity Display a web page or a list of contacts Dial a phone number or answer a phone call

3. As long as this cursor has columns expected by the live folder (such as name, description, and the program to invoke when that row is clicked), the system will present these rows as a ListView or a GridView. 4. Because the ListViews and GridViews are capable of updating their data when the underlying data store changes, these views are called live hence the name live folders. So two key principles are at work in live folders. The first is the set of same column names across cursors. The second is that the views know how to look for any updates and change themselves accordingly. This second point is not unique to live folders, but quite natural to all views in the Android UI. Now that you have some idea of what live folders are, we ll systematically explore the livefolder framework a bit more. We will do that in two subsections. In the first subsection, we will examine the overall end-user experience of a live folder. This should further solidify your understanding of the concept. In the second subsection, we will show you how to build a live folder correctly so that it is actually live. It does take some extra work to make a live folder live, so we will explore this not-so-obvious aspect of live folders.

Intents are not always initiated by your application they re also used by the system to notify your application of specific events (such as the arrival of a text message). Intents can be explicit or implicit. If you simply say that you want to display a URL, the system will decide what component will fulfill the intention. You can also provide specific information about what should handle the intention. Intents loosely couple the action and action handler.

Hex isn t used to confuse you. It is used because it is much easier to convert back to base 2 (like binary), which is what computers use. You don t have to be able to read hex with the same ease as decimal notation, but you should be able to recognize it, at least.

Data sharing among mobile applications on a device is common. Therefore, Android defines a standard mechanism for applications to share data (such as a list of contacts) without exposing the underlying storage, structure, and implementation. Through content providers, you can expose your data and have your applications use data from other applications.

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