.net upc-a reader

.net upc-a reader

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Much of an IBF solution revolves around the creation of solution metadata. As I explained earlier, metadata is nothing more than XML that is used by IBF to bind the elements of a solution together. When you re building and debugging an IBF solution, this metadata is maintained in an XML file in Visual Studio. When the IBF solution is deployed, however, the metadata is written to a SQL Server database that is available to all Office applications that will use the solution. The database, which is exposed to clients through a web service, is known as the metadata service. The metadata service serves as both a repository of metadata and a security boundary to prevent unauthorized users from executing the solution. Although the concept of metadata is simple, the structure of metadata in an IBF solution is not trivial, and this is what causes the learning curve to be so steep. Later in the chapter, I will define key metadata elements and show you how to properly configure them in an IBF solution. You will find, however, that the XML used by IBF can become quite complicated and borders on indecipherable at times. Fortunately, IBF provides us with several tools to generate and manage metadata, including a new Visual Studio .NET project type that provides a metadata explorer for viewing and managing metadata. Figure 5-3 shows a typical metadata explorer in Visual Studio .NET.

Even though this discussion of the HTML structure might seem basic and long-winded, it is important to realize that there is a nested structure because HTML event bubbling and how it occurs is directly related to this structure. Looking back at the HTML code, you can see that the div HTML element has the onclick attribute, which implements the onclick event. From a traditional programming perspective, the defined onclick event would capture only click events that relate directly to the div element. With event bubbling, the defined event will be triggered for all click events that involve the div element and one of its descendent elements. This means that if the nested button is clicked, the OnClick function is called. Event bubbling is a clever way to define collecting-type events that can be triggered by multiple HTML elements. However, event bubbling works only if the event bubbles. There are some HTML events that will not bubble and are specific to the HTML element. Let s say that an event has been triggered and is bubbling up the chain. If the event is caught and processed, the caught event can be canceled. The way to cancel the event is to return false, as illustrated by the following example: <div onclick="return false" /> Canceling an event that is bubbling works only if the event can be canceled. Canceling every onclick event is a solution when you don t want the browser to process certain events to disable functionality. In the example HTML, the event called the OnClick function will process the click event for multiple HTML elements. The implementation of the function is as follows:

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As you look at the requests and responses and do some mental math, you ll know that adding 1 and 2 results in the sum of 3 From the perspective of the contract, it would seem that everything is OK and that the system is implemented and works In reality, however, the illustrated HTTP conversations were all faked This leads to the following question: when developing a contract, how do you physically define the contract A purist might say, The contract is defined using some sort of tool that the client and server programmers then implement The purist answer sounds good and would be great if such a tool existed Unfortunately, no tool allows you to design REST-based HTTP conversations that can serve as the basis of the test and Mock URL layer.

E B V N function OnClick( evt) {

The Context and Action Service (CAS) engine is a client-side component that communicates with the metadata service and IBF-compliant web services. The CAS engine serves two functions. The first is to request metadata from the metadata service in response to user activity.

Faced with the fact that you don t have such a tool, using an editor to generate the HTTP conversation manually is incredibly error-prone and tedious I don t suggest that anybody should do that However, you still need to define a contract, but you can t do it without a tool or an editor Without any sort of documentation, the contract literally remains a figment of your imagination And figments of imagination are rather difficult to create test cases for The solution is to write the tests that make up the contracts, even though writing a bunch of tests does not make a contract The tests have to serve a dual purpose that is, they have to provide tests as well as act as documentation for how the contracts are called and used Therefore, it s important that you structure the tests clearly and make them verbose.

evt = (evt) evt : ((event) event : null); if( evt) { var elem = (evt.target) evt.target : ((evt.srcElement) evt.srcElement : null); if( elem) { document.getElementById( "eventDestination").innerHTML = "Click (" + elem.id + ")"; } }

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