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//--------------------------------------------------------// Constants /** * a flag. */ public static final int SOFT_NONE = 0; /** * a flag. */ public static final int SOFT_LEFT = 1; /** * a flag. */ public static final int SOFT_RIGHT = 2; //--------------------------------------------------------// instance data /** * The width of the handset's screen. */ int myWidth; /** * The height of the handset's screen. */ int myHeight; /** * Whether to create the softkeys for the current handset. */ boolean myUseSoftkeys; /** * A keycode for the current handset. */ int myLeftSoftkey; /** * A keycode for the current handset. */ int myRightSoftkey;

First, we need to create the online/offline functionality for the ACME POS client. To begin, open the ACME.POS.Service solution. Right-click the Add References node of the ACME.POS.Service.Client solution and add the following assemblies: Microsoft.Practices.EnterpriseLibrary.Caching.dll Microsoft.Practices.EnterpriseLibrary.Caching.Cryptography.dll ACME.POS.UserInterface.Configuration.dll Add a web reference to the Customer web service that was created in 8 to the ACME.POS.Service.Client. Name the class OfflineManager. Within the class, add the following using statements and ensure the class is public. using using using using using using using using System; System.Collections.Generic; System.Net; System.Text; Microsoft.Practices.EnterpriseLibrary.ExceptionHandling; Microsoft.Practices.EnterpriseLibrary.Caching; ACME.POS.Service.Client.ACMECustomerWebService; ACME.POS.UserInterface.Configuration;

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nxc, where all the robot constant definitions are specified: the motor ports; the sensor ports; and the opcodes for the various commands written in capital letters, such as A_FOLDED, T_DOWN, or UNKNOWN, for example The other inclusion is for the communication library described earlier After the initial definitions, the code goes on with the low-level routines for the mechanics The program starts executing the main task; here the J5_Init() function is called After that, an infinite loop is started, to receive and execute the commands for the master NXT The incoming commands are received using the ReceiveHSNumber(cmd) function Note that the ReceiveHSNumber function is called inside the parentheses of the if structure, and so the value returned by that function affects the subsequent working.

namespace ACME.POS.Service.Client { public class OfflineManager { } } Next, add the TestWebServer method and GetUrl property. The TestWebServer method will take a URL and a timeout value. This method will test to ensure the URL exists. This will tell the application whether to save data locally or to the ACME server. The GetUrl property will retrieve the default web service URL from the application configuration file. Listing 10-13 shows these additions. Listing 10-13. Adding the testWebServer Method namespace ACME.POS.Service.Client { public class OfflineManager { private string m_Url ; private bool TestWebServer(string Url, int Timeout) { HttpWebRequest httpRequest = WebRequest.Create(Url) as HttpWebRequest;

//--------------------------------------------------------// data for internal use /** * The custom data corresponding to the current handset. */ Properties myProperties; /** * The labels corresponding to the current language. */ Properties myLabels; /** * The image file containing all of the labels for the * current handset. */ Image myLabelImage; /** * The names of the image files for the current language * and handset. */ Properties myLabelImages; //--------------------------------------------------------// initialization /** * construct the custom data. * @param width the width of the display. * @param height the height of the display. */ public Customizer(int width, int height) { myWidth = width; myHeight = height; } /** * construct the custom data. */ public void init() throws IOException { InputStream is = null; // step 1 is to determine the correct language: String locale = System.getProperty("microedition.locale");

HttpWebResponse httpResponse = null; bool testResult = false; try { //Don't allow infinite timeouts if (Timeout > 0) httpRequest.Timeout = Timeout; // Set resource limits httpRequest.MaximumAutomaticRedirections = 4; httpRequest.MaximumResponseHeadersLength = 4; // Set credentials httpRequest.Credentials = CredentialCache.DefaultCredentials; httpResponse = httpRequest.GetResponse() as HttpWebResponse; testResult = true; } catch { //Ignore any exception that occurs } finally { if (httpResponse != null) { httpResponse.Close(); } } return testResult; } private string GetUrl { get { if(String.IsNullOrEmpty(m_Url)) { WebServiceSettings settings = new WebServiceSettings(); m_Url = settings.WebServiceURLs.Get( settings.DefaultWebServiceURL).URL; } return m_Url; } } } }

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