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Listing 4-9. Playing an Audio File /** * Read the audio file from the JAR and play it. */ void playMusic() { try { // create an input stream that can be used to read the // music data from a file called music.wav in a directory // called resources in this program's JAR file. InputStream is = getClass().getResourceAsStream("/resources/music.wav"); // create a media player to play the music file, and // inform the player that the format is "audio/X-wav" Player player = Manager.createPlayer(is, "audio/X-wav"); // start the music player.start(); } catch (IOException ioe) { // deal with the exception } catch (MediaException me) { // deal with the exception } } Before creating the Player, you can verify that the implementation supports playback of files in your chosen format by calling Manager.getSupportedContentTypes(). Some common types include .wav audio files (MIME type: audio/x-wav), .au audio files (MIME type: audio/basic), .mp3 audio files (MIME type: audio/mpeg), and .midi files (MIME type: audio/midi). Once you have an instance of Player, you have a number of methods at your disposition for controlling the Player s lifecycle. Using realize(), you can tell the player to do any preliminary construction steps without acquiring device resources, and the methods prefetch() and deallocate() allow you to instruct the Player to acquire (and release) the resources that the player needs in order to play. Then you can start and stop the music using the aptly named start() and stop() methods and close the player down with the method close().

Listing 9-9. Avoiding Machine-Gun Effects When Using Joysticks to Trigger Discrete Commands R_action = DecodeDir(R_cmd); if ( (R_action!=oldRf) || continuous ) { if (R_action>0) { //do something } if (R_action<0) { //do something else } } oldRf = R_action; First, the DecodeDir function calculates the direction of the joystick displacement (the right one in the example), by returning just 1, 0, or -1 and not a speed level. Then, the action corresponding to the joystick inclination is performed only if the actual R_action is different from the one saved before in the oldRf variable, and updated with the current R_action value only after the desired action has been performed. This way, no action will be retriggered until the joystick has returned to its center position, so that the DecodeDir function will return a value different from before. Notice that, if the continuous variable is true, the logical OR || function will force the whole condition ((R_action!=oldRf) || continuous) to be true, and some action will be performed anyway, no matter if R_action is equal to oldRf or not. For example, if the right joystick is moved forward, the DecodeDir function will return 1, thus triggering the action inside the if(R_action>0) {...} block. This block becomes unreachable if the (R_action!=R_old) condition is false, until the joystick does not return to its center (DecodeDir thus returns 0). This trick is necessary because the Mode1Actions function is called about 20 times per second notice that the loop calls Wait(50) and not only when the joysticks are moved. That said, you should now know how to bend the receiver program s template to your will.

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Now the SqlConnection object requires a connection string to determine specific parameters required by SQL Server in order to connect to it In this particular case, Steve decides to just hard-code the string into the code: public class myLookupDataAccessClass { public ReportLookUpData GetReportLookUpData() { string myConn = "server=MyServer;database=MyDatabase;Integrated.

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Now let s get building! The construction is simple, because it just uses a bunch of parts from the NXT retail set. You need two NXT retail sets to build the robot and the R/C. To build the remote shown here, you need an extra Touch Sensor and an extra 20cm (8 inch) cable. You can replace the extra short cable with a longer spare one you have in the set.

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