vb.net data matrix reader

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In each of the previous examples, an array was created with exactly as many elements as were added with the XML. By using the length parameter, you can indicate for how many items the array is dimensioned, and no more than the indicated number of elements can be added with XML. If there are fewer items to be added than specified with the length attribute, the array is filled at the end with uninitialized elements having a null value. In the configuration file in Listing 12-22, an integer array is created and dimensioned for ten elements, but only four will be added. Listing 12-22. Predimensioning Arrays with the length Parameter </Emulator> < xml version="1.0" encoding="utf-8" > <Emulator> <Types> <MyComp>ConfigurationSampleEmulator.MyComp, ConfigurationSampleEmulator</MyComp> </Types> <EmulatorComponents> <MyComp id="MyComp"> <IntegerArrayProp length="10"> <System.Int32>1</System.Int32> <System.Int32>2</System.Int32> <System.Int32>3</System.Int32> <System.Int32>4</System.Int32> </IntegerArrayProp> </MyComp> </EmulatorComponents>

For this first example, consider the following scenario: You have a data-driven web page that needs to continuously alert the user with fast changing data, for instance, a page that displays the major financial indices in the U.S. capital markets: Dow Jones Industrial Average (DJIA), NASDAQ, and S&P500. One approach is to place a <META> tag in your page with refresh values that then force the page to refresh itself in regular intervals based on the provided value. But if you wanted to make the page behave more like a desktop application and update the data without page refresh, AJAX is definitely the recommended path. By now, you have seen the basics of the ScriptManager, UpdatePanel, UpdateProgress, and the Timer server controls in ASP.NET AJAX and have a good understanding of their functionality. So, with that in mind, let s build a quick application that does exactly what was talked about earlier: displays the three main indices of the American capital markets and continues to update the page with (simulated) real-time data without any page refresh.

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In the example in Figure 12-1, the BRE is called from within an orchestration. However, that is not the only avenue of access for the BRE. You can also use an API implementation of the product, as illustrated in Figure 12-2.

public TimeSpan LastExpiration { get; }

NOTE Do not confuse the message protocol with the transport protocol. SOAP is a message protocol that provides a specification for constructing messages. HTTP TCP and SMTP are transport protocols, which are different specifica, , tions for transporting messages. SOAP messages may be delivered using all of these transport protocols.

With the advent of the personal computer, much of the old server functionality wasn t necessary anymore. This was because the main use of servers at that time was for functions that could easily take place on a personal computer, such as calculations or analyses (see Figure 1-3). Functionality that required connectivity, such as email and network newsreaders, could still be achieved on a personal computer through terminal emulation. Then someone had the bright idea of using the power of the personal computer to enhance the online experience, taking it away from the green-and-black terminal and allowing features such as email, news, and graphics to appear in full four-color glory (see Figure 1-4). The personal computer flourished in power, and the early personal computers gave way to much more powerful machines with better graphics, faster processing chips, more memory, and persistent storage through hard drives.

A field is a variable that belongs to a class. It can be of any type, either predefined or user-defined. Like all variables, fields store data, and have the following characteristics: They can be written to. They can be read from. The minimum syntax for declaring a field is the following: Type Type Identifier; Field name For example, the following class contains the declaration of field MyField, which can store an int value: class MyClass { Type int MyField; } Field name

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