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let form = new Form() newImgEvent.Add(fun img -> form.BackgroundImage <- img) [<STAThread>] do Application.Run(form) To create the client, you must first create a proxy, using the same technique that you used in the example given in Listing 10-10. The utility SvcUtil.exe is run passing it the URL of the service, and this creates a proxy in C# that can be compiled into a .NET assembly and used from F#. In this case, the proxy is named ImageServiceClient. The definition of the client in Listing 10-15 might look a little complicated, but a lot of the code just lays out the form s controls or opens the image files. The really interesting code comes right at the end, where you add a function to the Send button s click event. This code reads an image from disk and loads it into a byte array. This byte array is then passed to the proxy s ReceiveImage method. Listing 10-15. A Client That Sends Images to Its Server #light open System open System.IO open System.Windows.Forms let form = let temp = new Form(Width=272, Height=64) let imagePath = new TextBox(Top=8, Left=8, Width=128) let browse = new Button(Top=8, Width=32, Left=8+imagePath.Right, Text = "...") browse.Click.Add(fun _ -> let dialog = new OpenFileDialog() if dialog.ShowDialog() = DialogResult.OK then imagePath.Text <- dialog.FileName) let send = new Button(Top=8, Left=8+browse.Right, Text = "Send") send.Click.Add(fun _ -> let buffer = File.ReadAllBytes(imagePath.Text) let service = new ImageServiceClient() service.ReceiveImage(buffer)) temp.Controls.Add(imagePath) temp.Controls.Add(browse) temp.Controls.Add(send) temp [<STAThread>] do Application.Run(form)

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Figure 2-19. Display Value output One last thing you need to understand about My Blocks is where they are kept on your computer. They aren t stored in the same directory as your NXT-G programs ( /LEGO Creations/MINDSTORMS Projects/Profiles/Default). You find them in a further subdirectory (/Blocks/My Blocks). If someone gives you a NXT-G program that contains My Blocks, they must be stored in that directory for everything to work. With first generation NXT-G software, this has to be done by hand. Second-generation NXT-G included a Create Pack and Go tool that made a single distribution (.rbtx) file that contains all the files needed for the program to run. That includes any My Blocks, image files, and sound files. The software also knows how to unpack these distributions and put all the files in the right place.

Figure 10-5 shows the example being executed. The user is about to select an image to send to the client.

are required to implement these APIs and exhibit the prescribed behavior, maximizing the portability of scripts between browsers.

Figure 10-5. A WCF service hosted in a Windows form This is not quite the whole story for a desktop application that listens for updates. The client that sends out updates needs to know the services and desktop applications to which it should send updates. In the services, you do this very simply by hard-coding the address of the service. In the real world, you d need to implement a service in the other direction as well. This service would tell the central client that a service was listening for updates and alert the central client when a service stops. Then the central client would need to loop through all services that were listening for updates and push the data out to each one of them.

My Blocks are great for creating subroutines, but at some point you will need to add something so complex that it requires a whole new NXT-G block. Sensors, for example, require low-level NXT control that you just can t get in a My Block. Fortunately, you can easily import new blocks to NXT-G using the Block Import Wizard. We will illustrate the process by importing a couple of blocks essential to building projects in this book. The original MINDSTORMS RCX had a couple of unique sensor types (Temperature and Rotation, for example) that are also supported by the NXT. The NXT software doesn t include these sensors by default because it is not very likely that someone buying a new NXT kit would own them. However, they are very useful for building homebrew sensors. Fortunately, LEGO provides a library of these Legacy Blocks on their MINDSTORMS Support page shown in Figure 2-20.