.NET/Java PDF, Tiff, Barcode SDK Library

It is the goal of the Windows Communication Framework (WCF) to provide a unified model for creating distributed applications. The idea is that you create a service, something very similar to a web service, containing the functionality you want to expose. This service can then be exposed in a variety of different ways. For example, web services always pass XML messages, but WCF services can be configured to pass binary data or XML messages. Further, WFC services can be hosted in any process, rather than just on a web server. This means you could create a desktop application that listens for incoming messages without having to install a web server on the desktop.

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Unlinkable pages: You may have noticed that in most of the figures we ve shown you, the address bar doesn t change even when the page does. When you use the XMLHttpRequest object to communicate with the server, you never need to modify the URL displayed in the address bar. While this may actually be a plus in some Web applications, it also means your users cannot bookmark your page or send a URL to their friends (think about maps or driving directions). This isn t insurmountable; in fact, Google Maps now includes a Link to This Page link (see Figure 8-4). If links are key to your application or site, be aware that Ajax makes this a bit a challenge.

Figure 14-15. Remote control bluesend program main loop The NXT Quick Start Vehicle is a convenient starting point for a remote-control vehicle. All you need to do is load the bluereceive program shown in Figure 14-16. The receiver program just gets the steering and power values for a Move block from the two Bluetooth mailboxes. You determine the direction of the power command by comparing it with zero.

= 1999 ; month = 12; day = 31 }; 1999 ; month = 12; day = 31 }; 1999 ; month = 12; day = 31 } ]

Figure 8-4. Google Maps Link to This Page link Asynchronous changes: Talking to the server asynchronously is one of the real steps forward with Ajax; however, it isn t without its issues. We ve talked about this a few times, but it s worth discussing again: users have been trained to expect the entire page to be repainted anytime things change, so they may not notice when you update just parts of the page. Just because you can reload parts of the page doesn t mean this is the right approach for your entire application use this approach judiciously.

Figure 14-16. Remote control bluereceive program You need to use the Bluetooth menu on the remote-control NXT to establish the connection with the vehicle NXT as connection 1 and then run the programs. Refer to the LEGO MINDSTORMS User

List.iter (fun d -> print_int d.year) fsDateList fsDateList |> List.iter (fun d -> print_int d.year) Although this code is virtually the same as the previous example, it will compile without error. This is because the compiler can infer that the parameter d is of type date from the use of date s year field. It is important to remember that both cases work here, so although the forward operator isn t quite as useful when working with F# s record types and its union type, you can still use it. In fact, you should consider using it even when working with F# types, because this will lead to working with both external .NET types and F# types in a consistent manner. The forward operator > operator > operator is also incredibly useful when trying to chain functions together, that is, when one function operates on the result of another. Consider the next example, where you obtain a list of all the .NET assemblies in memory and then process this list until you end up with a list of all the .NET methods in memory. As each function operates on the result of the previous function, the forward operator is used to show the results being piped or passed forward to the next function. You don t need to declare intermediate variables to hold the results of a function. #light let methods = System.AppDomain.CurrentDomain.GetAssemblies() |> List.of_array |> List.map ( fun assm -> assm.GetTypes() ) |> Array.concat |> List.of_array |> List.map ( fun t -> t.GetMethods() ) |> Array.concat print_any methods You ll use this technique throughout the rest of the book, particularly when you cover data access in 9.

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