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At the beginning of the program, you can initialize port 4 by calling SetHSPort(); This is enough to tell the NXT firmware to enable the RS485 chip for the serial communication. To send a string, simply call SendHSString ( msg ); where msg is the string you want to send. To send a number, call SendHSNumber ( num ); where num is the integer you want to send. To receive a string, make the following call: result = ReceiveHSString ( msg ); After the call, the Boolean result will be true if the buffer is not empty, and the msg string will contain the received data. If the buffer is empty, or the data is equal to zero, the result value will be false. To receive an integer number, call result = ReceiveHSNumber ( num ); As before, after the call, the Boolean result will be true if the buffer is not empty, and the num variable will contain the received data. If the buffer is empty, or the data is equal to zero, the result value will be false. This function, as does the preceding, features a timeout mechanism to avoid remaining stuck if the high-speed buffer is empty. Next I ll describe the two programs in outline form, starting from the slave the simpler and proceeding with the master, where I ll focus on the sound counting routine.

This section will demonstrate how to create custom hash and symmetric encryption providers. For the examples, add a new class library to the CryptographyDemo solution and name it CryptographyDemoLibrary. Then add the following references: Microsoft.Practices.EnterpriseLibrary.Security.Cryptography.dll Microsoft.Practices.EnterpriseLibrary. Security.Cryptography.Configuration.dll Microsoft.Practices.EnterpriseLibrary.Common.dll System.Configuration.dll System.Security.dll

Figure 10-1. The command menu of the old version of Dungeon and the new version of Dungeon running on a large-screen emulator with Locale (language) set to French

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Creating a custom hash algorithm is not for the faint of heart or the mathematically challenged. It is a subject that has entire books and college courses devoted to it. Since this section is meant to demonstrate the creation of a provider and not the implementation of a hashing algorithm, the code will simply wrap the MD5 provider supplied by the .NET Framework. To begin, add a new class to the CryptographyDemoLibrary project and name it DemoHashProvider.cs. Then add the proper using statements and inherit the IHashProvider interface, as shown in Listing 10-9.

CHAPTER 8 JOHNNXT IS ALIVE!

As you ve seen throughout this book, handling the differences between one platform and the next is a constant problem that you always need to keep in mind. It comes up in obvious ways when writing a GUI as you choose what sizes and kinds of graphics are appropriate and optimize the use of resources for a given handset. Less obvious issues also come up such as identifying different keypress actions using keycodes, as you ll see in the Implementing Softkeys section later in this chapter. And while you re customizing your labels and other strings, it s a good time to think about adding custom labels for different languages as well.

Listing 10-9. Inheriting the IHashProvider Interface using using using using using Microsoft.Practices.EnterpriseLibrary.Security.Cryptography; Microsoft.Practices.EnterpriseLibrary.Security.Cryptography.Configuration; Microsoft.Practices.EnterpriseLibrary.Common.Configuration; System.Security.Cryptography; System.Collections.Specialized;

The program discussed in this section gives your robot the ability to walk everywhere, by avoiding obstacles. Download the sound files provided, together with the source code, to the NXT using BricxCC, so that the NXT can play them.

namespace DGTEL.CryptographyLibrary { public class DemoHashProvider: IHashProvider { public DemoHashProvider(NameValueCollection attributes) { } #region IHashProvider Members public bool CompareHash(byte[] plaintext, byte[] hashedtext) { } public byte[] CreateHash(byte[] plaintext) { } #endregion } } Next, add the ConfigurationElementType attribute to the class. Then implement the IHashMembers interface. Listing 10-10 shows these additions. Listing 10-10. Creating a Custom Hash Provider Class using Microsoft.Practices.EnterpriseLibrary.Security.Cryptography; using Microsoft.Practices.EnterpriseLibrary.Security.Cryptography. Configuration; using Microsoft.Practices.EnterpriseLibrary.Common.Configuration; using System.Security.Cryptography; using System.Collections.Specialized; namespace DGTEL.CryptographyLibrary {

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