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/** * Uses an output stream to convert an int to four bytes. */ public static byte[] intToFourBytes(int i) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(4); DataOutputStream dos = new DataOutputStream(baos); dos.writeInt(i); baos.close(); dos.close(); byte[] retArray = baos.toByteArray(); return(retArray); } //-------------------------------------------------------// integer interpretation illustrated /** * Java appears to treat a byte as being signed when * returning it as an int--this function converts from * the signed value to the corresponding unsigned value. * This method is used by nostreamParseInt. */ public static int unsign(int signed) { int retVal = signed; if(retVal < 0) { retVal += 256; } return(retVal); } /** * Takes an array of bytes and returns an int. * This version will return the same value as the * method parseInt previously. This version is included * in order to illustrate how Java encodes int values * in terms of bytes. * @param data an array of 1, 2, or 4 bytes. */ public static int nostreamParseInt(byte[] data) { // byte 0 is the high byte, which is assumed // to be signed. As you add the lower bytes // one by one, you unsign them because // a single byte alone is interpreted as signed, // but in an int only the top byte should be signed. // (note that the high byte is the first one in the array) int retVal = data[0]; for(int i = 1; i < data.length; i++) { retVal = retVal << 8;

The configuration source implementations will cache the configuration data in memory for subsequent calls to the configuration sections. This creates a problem if the configuration file changes while an application is executing. To solve this, Enterprise Library has a file watcher feature that monitors the configuration files for changes. If a change does occur, it can refresh the configuration section objects to reflect the recent changes to keep the in-memory cached data as up-to-date as possible.

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Using the system configuration source is probably the easiest and simplest way to use the configuration features at least from a coding standpoint. One of the big reasons for this simplicity is that the storage of the configuration data is the actual application configuration file for the application (app.config/web.config). However, you do need to be careful to make sure the configuration data is still manageable. The more configuration data that is stored, the harder it can become to manage. Although it is possible to create components for the Enterprise Library Configuration Console to help manage your configuration data, it may not always be practical to do so. ( 5 discusses the Configuration Console and how to create your own design-time classes to manage configuration data.) In Listing 4-2, a simple class called MyCustomSection was created to store two configuration settings that were shown in the configuration file in Listing 4-1. Listing 4-4 then displayed the configuration data to a console window. Listing 4-5 demonstrates how this is done using the SystemConfigurationSource class. Listing 4-5. Display Configuration Settings in Console Window Using the SystemConfigurationSource Class using System; using System.Configuration; using Microsoft.Practices.EnterpriseLibrary.Common.Configuration; public class MyApp { static public void Main(string[] args) { IConfigurationSource myConfigurationSource = new SystemConfigurationSource(); //Load my section from config MyCustomSection section = myConfigurationSource.GetSection ("myCustomSection") as MyCustomSection; //Code to display configuration data to console } }

You ve made it through the first chapter with building instructions. You should feel satisfied you ve just built a biped that uses many of the techniques described in 1. This robot is representative of the first category I discussed in this book: interlacing legs bipeds. In addition, I ve also given you the first smattering of NXC programming. Not so scary, is it After learning some more theory in 3, you ll be able to build and program a scale-sized replica of the imperial AT-ST in 4: the All Terrain Scout Transport walker from the Star Wars saga.

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