ASP.NET PDF Viewer using C#, VB/NET

The assumption is that the server socket is running locally. In such an instance, the preceding code works without any extra help. In real-life deployment environments, though, this will rarely be the case. The server socket would run on some domain.com and would listen on some port, say 8080. Like everything else in Flash, the player security restrictions and requirements would kick in and you d need to define a policy file so that such operations are permitted. You could configure the application in such a way that the policy file is read over the same port, and then the socket connection is established and used for communication. In this chapter, the primary inspiration is to integrate Flex and Java. Often the remote data published by Java is going to be accessible over standard protocols like HTTP. So classes like HTTPService and URLLoader would be enough to communicate in most cases. However, as we saw, both these classes have their limitations, and in some cases, it s feasible to use the Socket class. In such cases, the requirement may be to connect over port 80, which is usually the default HTTP port. According to the security policy, any port below 1024 when accessed through Sockets needs special permission in its policy files. So once more, you d have to ensure that the policy file has the relevant permissions and is in place. This ends the peek into the Socket classes. However, before wrapping up and moving to the next topic, it is extremely important to mention a few things about sockets.

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C++ specifically (actually LH talks in terms of squares and rectangles, not circles and ellipses, but the examples are isomorphic, of course). Well, maybe it is unwise; but if so, then that s a problem with C++ specifically, it s not an argument for saying that circles should never (or almost never ) be treated as ellipses. That a square is a rectangle is true enough in carefully written code : I don t think code, carefully written or otherwise, has anything to do with the matter. In fact, the argument that code should dictate whether or not a circle is an ellipse seems to me to be 100 percent backward. A circle is an ellipse, and if your code doesn t support that fact, then there s something wrong with your code. By the way, treating circles as ellipses is not only logically correct, it s positively desirable in the context of (at least) spatial or temporal data. Furthermore (as noted in the body of the chapter), Hugh Darwen and I not only think we know how to do it, we think we know how to do it efficiently.

AS3 does not define any server socket class. It is not expecting an application running in the Flash Player to act as one. Data could be sent over the persistent socket connection, without being asked for. So, data streaming from the server to the client can be achieved quite efficiently. Such arriving data triggers the DataEvent.DATA event. Data upload onto the socket channel is asynchronous, and as of now, there is no way to measure how much of it has been transmitted to the server until the entire process completes. If you are looking to write an HTTP client using Socket so that the limitations of HTTPService and URLLoader are eradicated, you re in luck. Don t reinvent the wheel; just go ahead and use as3httpclientlib (http://code.google.com/p/as3httpclientlib/). This library s API resembles the Apache HTTP client, simple and clean. Sockets can be used to build real-time systems where the server needs to stream data up to the client, but it wouldn t work if this connection has a firewall to cross.

Figure 5-8. The Render Camera Preview window helps test how your animation is progressing. If it s very short, you may want to select the Loop check box in the lower-right corner to see the animation over and over again. Click the Stop button if your animation is still looping, and then click the Illustration tab to switch back to Editing mode.

Here are some quotes from a series of responses, all from the same person: I m not surprised that Dr S had problems with [the circles and ellipses article] .. Chris Date .. makes two fundamental errors with this article, these stopped me reading less than half the way through I ll reserve judgment on this extract until we find out what the alleged errors are (see later) As a quick point a class is a programming level realization of a type If in ooa you specify the classification type and some of its properties this could be modelled in any number of ways in any number of languages (of course also non oop s) A class in most oop s refers to the code itself that is a template for instantiation of behaviour ...

That finishes our look at sockets. Although there s more to the topic than what we cover here, further discussion is outside the scope of this book. Let s jump to the second main topic of this chapter: web services.

(As a follow on an object is most often an instantiation of a class, oop language terms vary of course) As I pointed out in my original article as clearly as I could! there s no consensus on what a class is and what a type is For the purposes of that article, I said I was going to take the terms as synonymous I don t want to quibble over terminology; the concepts are what I m interested in, and playing games with the terms doesn t invalidate any of the points I tried to make [The first error:] In basing your criticism on the C++ paragraph you miss the context This is talking about implementation issues NOT about pure theory.