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For each example, the level of complexity has increased, and the only remaining scenario to explain is the server push. What makes a server push unique is that each client accessing the global resource (for example, http://mydomain.com/global/resource) has a unique child URL (for example, http://mydomain.com/global/resource/unique-child). In previous examples, the URL used was a global resource that was shared among individual users. This time the URL must be unique because when the server pushes content, it is individualized. As a side note, when referencing the unique URLs for the scope of this example, the unique identifier will always be a username or user identifier. That does not need to be the case; it could be a feed identifier, message queue, and so on. The unique identifier represents some type of unique resource that distinguishes itself from the other resources. It also does not mean that a single user is allocated a single resource. It could be that multiple users share the same unique resource. qr code reader c# .net . NET Barcode Scanner Library API for . NET Barcode Reading and ...
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Find out most popular NuGet qrcode Packages. ... Reader . Bytescout Barcode Reader SDK for . NET , ASP. NET , ActiveX/COM - read barcodes .... The C# and . Figure 3-1. Factory pattern example console output As you can see, you could have many variants of a particular interface and determine which variant of a class you want to return. This could be useful for developing a data access layer for an application and ensuring that the data access layer abstracts the specific data access provider through a Factory pattern implementation. The example in Listing 3-1 also uses an interface to provide the different invariant interfaces to the MyDemo class. It is possible to use an abstract class to perform the same function. In fact, abstract classes could provide common functionality and provide a better mechanism for handling versioning over an interface. qr code reader c# .net How To Generate QR Code Using ASP . NET - C# Corner
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Open Source library: http://www.codeproject.com/KB/cs/ qrcode .aspx. Paid library: ... The UFO mother ship uses the same system as the enemy turrets to fire bullets at the lander. However, unlike the turrets, it s moving. It flies in a fixed elliptical path across the planet surface, as shown in Figure 7-24. vb.net qr code reader free ZBar bar code reader
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The VB . NET QR Code scanning decoder control component fast reads QR Code barcode images in .NET framework projects. Another pattern that is used in Enterprise Library application blocks is the Plug-in pattern. This pattern allows for extending the behavior of an existing class to suit a specific need by defining the correct instance outside the existing class. Reconsidering Listing 3-1, suppose that the appropriate IDemo instance returned is to be determined by an environment variable. Say there are ten environments that need ten different instances of IDemo. To support that, ten different case statements would be required within the switch state of the CreateInstance method. Although this wouldn t be that difficult to handle in this scenario, imagine an enterprise scenario where there could be hundreds of factories returning different instances. One way to prevent this type of maintenance headache is to use the Plug-in pattern. Now the correct component can be determined at runtime, based on a configuration file provided for the specific environment. In this case, a Factory pattern could still be used, but a demoType would not be passed in as a parameter of the CreateInstance method. Instead, the CreateInstance method would look at a configuration file to determine the appropriate IDemo instance to create. Listings 3-2 and 3-3 show an example of this. Listing 3-2. Plug-in Pattern Configuration Example <myDemoConfig> <object type="MyDemo.AlphaDemo" assembly="MyDemo"/> </myDemoConfig> Figure 7-24. The enemy mother ship travels in a fixed elliptical path above the planet surface. Two pairs of values determine the position and shape of the ellipse: centerX/centerY: You need to know where on the stage the center of the ellipse will be the centerX and centerY values. For example, to place the center of the ellipse in the center of the stage, use these two values: centerX = 275; centerY = 200; Before continuing with the server push implementation, a bit more thought to specifying the URL has to be given. For the Permutations pattern, I illustrated how to generate and retrieve URLs. You saw techniques for associating a representation with a resource based on the needs of the client. When using the server push, the URL must be unique, and this can be a problem because we don t know what the URL is in the first place. The question is how to figure out that the URL http://mydomain.com/global/resource/unique-child is unique based on the global resource http://mydomain.com/global/resource. Using a Hard-Coded URL A hard-coded URL is a URL that is written directly into the HTML, as illustrated by the following example: <html> <head> <title>Hard Code Reference</title> <script language="JavaScript" src="../lib/factory.js"></script> <script language="JavaScript" src="../lib/asynchronous.js"></script> <script language="JavaScript" type="text/javascript"> var asynchronous = new Asynchronous(); rangeX/rangeY: You need to know how wide and how high the ellipse will be. I call this rangeX and rangeY. For example, if you want the ellipse to be 400 pixels wide and 200 pixels high, use these two values: rangeX = 200; rangeY = 100; This is similar to a radius, but unlike a circle s radius, the width and height are not the same. Figure 7-25 shows what kind of ellipse you would end up with if you used these values. asp.net qr code reader ByteScout Barcode Reader SDK - VB . NET - Decode QR Code ...
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