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// note there are three slashes before the root name // because there is no "host" for this connection: rootdir = (FileConnection)Connector.open( "file:///" + rootname); // List the current files: Enumeration ls = rootdir.list(); while(ls.hasMoreElements()) { String filename = (String)(ls.nextElement()); myMidlet.display(" file: " + filename); // print the contents of the file: FileConnection file = null; try { file = (FileConnection)Connector.open( "file:///" + rootname + "/" + filename); if(file.canRead()) { InputStream is = file.openInputStream(); byte[] contents = new byte[25]; int len = is.read(contents); is.close(); myMidlet.display(" contents: " + new String(contents, 0, len)); } else { myMidlet.display(" * not readable"); } } catch(Exception e) { e.printStackTrace(); } finally { try { file.close(); } catch(Exception e) {} } } // now try to create a file: FileConnection newfile = null; try { newfile = (FileConnection)Connector.open( "file:///" + rootname + "myNewFile"); if(newfile.exists()) { OutputStream os = newfile.openOutputStream(); os.write((new String("overwriting old contents")).getBytes()); os.close(); } else { newfile.create(); OutputStream os = newfile.openOutputStream(); os.write((new String("creating new contents")).getBytes()); os.close();

Play Number Five is alive!" Play I am alive. Play Yeah! Johnny 5! That s cool! Play Hello, bozos! Play Need input! Play Malfunction! Play soundtrack loop Stop sounds Play one of the preceding sounds randomly

Listing 11-12. Adding the SaveSecurityCacheItem Methods public IToken SaveSecurityCacheItem(SecurityCacheItem item) { IToken token = new GuidToken(); SaveSecurityCacheItem(item, token); return token; } public void SaveSecurityCacheItem( SecurityCacheItem item, IToken token) { SecurityCacheItem cacheItem = null; cacheItem = securityCacheManager.GetData(token.Value) as SecurityCacheItem; if (cacheItem == null) { securityCacheManager.Add(token.Value, item, CacheItemPriority.Normal, null, GetCacheExpirations()); } else { cacheItem.Identity = item.Identity; cacheItem.Principal = item.Principal; cacheItem.Profile = item.Profile; } } Compile the code and copy the new assembly to the bin directory of the Enterprise Library installation. Create a reference to the new assembly from the demo application.

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The hardest part is complete, and now it is time to configure the new security cache provider. The unfortunate part about creating a custom provider is that the easiest implementation requires that any properties be added as attributes. Since the sample security cache provider uses the same cache manager as the default caching store provider, you will need to add attributes to the configuration. The few steps listed here will set up the DemoSecurityCacheProvider class to be used with the cache manager that was configured earlier in the chapter.

} } catch(Exception e) { e.printStackTrace(); } finally { try { newfile.close(); } catch(Exception e) {} } } } catch(Exception e) { e.printStackTrace(); } finally { try { rootdir.close(); } catch(Exception e) {} } } } The corresponding MIDlet class to run this thread is just a simple variant of the other MIDlet classes, such as Listing 7-2. The only difference is that it needs to include a display method that writes a string to the screen. This is shown in Listing 7-7. Listing 7-7. FCTest.java package net.frog_parrot.net; import import import import import import javax.microedition.lcdui.Command; javax.microedition.lcdui.CommandListener; javax.microedition.lcdui.Display; javax.microedition.lcdui.Displayable; javax.microedition.lcdui.Form; javax.microedition.midlet.MIDlet;

The torso, arms, and laser motors are connected to the slave NXT on the ports specified in Table 8-4. Table 8-4. Slave NXT Constant Definitions for Motors and Sensors

Listing 9-3. Logging Using Extended Properties private void m_WriteLogEntryButton_Click(object sender, EventArgs e) { // Create and fill new LogEntry object LogEntry entry = new LogEntry(); entry.EventId = 1; entry.Priority = 0; entry.Categories.Add("Trace"); entry.Severity = TraceEventType.Critical; entry.Message = "This is a test message";

OUT_A OUT_B OUT_C IN_1

/** * A simple MIDlet to test which APIs are implemented. */ public class FCTest extends MIDlet implements CommandListener { private Command myExitCommand = new Command("Exit", Command.EXIT, 1); private Command myOkCommand = new Command("OK", Command.OK, 1); private Form myResultScreen; /** * Empty constructor. */ public FCTest() { }

// Add extended properties to the LogEntry, if checked if (m_LogExtendedProp.Checked) { entry.ExtendedProperties.Add("AuditTrackingCode", 1000); } // Write the LogEntry Logger.Write(entry); }

The Tracer class has a simple usage model. By utilizing the using clause, trace information can be generated automatically for a series of operations. When executing a trace, the first parameter is a string identified as operation. This is actually the logging category. Add a new button to the project form, set its Text property to Trace Click, and name it m_TraceButton. Write the code shown in Listing 9-4 into the click event handler for the button. Listing 9-4. Using Tracer private void m_TraceButton_Click(object sender, EventArgs e) { using (new Tracer("TraceButton Trace Events")) { // Execute the button click event code } } The resulting output if the .NET Framework XmlWriterTraceListener is used would look like Listing 9-5.

You can control those motors by calling the following function (implemented inside J5_comm.nxc) within JohnNXT s master program: Remote (opcode, ack) opcode is one of the constants in Table 8-5, and ack can be either ACK_RX or ACK_DONE. With ACK_RX, the master program just waits for the slave to receive the command, while with ACK_DONE, the master program hangs on until the slave has finished the action it was told to do. The constants listed in Table 8-5 are used in the slave program both as commands to be executed and as state descriptions.

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