java pdf 417 reader Reading a Record of a String Data Type into a RecordEnumeration in Java

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Reading a Record of a String Data Type into a RecordEnumeration
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Here are the steps required to read a record of a string data type into a RecordEnumeration: 1 Declare references to classes
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2 Create instances of classes and assign those instances to references 3 Open a record store and create a new record store if the record store doesn t exist 4 Display any errors that occur when opening/creating a record store 5 Create data in the appropriate data type 6 Convert data to a byte array 7 Write the record to the record store 8 Display any errors that might occur while writing to the record store 9 Create a RecordEnumeration 10 Loop through the RecordEnumeration, copying each record to a variable 11 Display the data in a dialog box 12 Display any errors that occur when reading records from the RecordEnumeration 13 Close and remove the RecordEnumeration and the record store
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Another change is in the third try {} block, where records from the record store are copied into the RecordEnumeration and then displayed on the screen The first statement in this try {} block creates a RecordEnumeration by calling the enumerateRecords() method The RecordEnumeration doesn t use a filter or comparator and is not automatically updated when changes are made to the underlying record store Before entering the while loop, the MIDlet calls the hasNextElement() method to determine whether there is a next record in the RecordEnumeration Remember that the RecordEnumeration is not at the first record, so the hasNextElement() method determines whether there is a record in the record store A boolean true is returned if a record exists, otherwise a false is returned If a true is returned by the hasNextElement(), the MIDlet copies the first record of the RecordEnumeration into a string, which is then displayed in an alert dialog box Of course, you can further process the record instead of displaying the record, depending on the nature of your application This process continues until the hasNextElement() method returns a false, indicating no more records exist in the RecordEnumeration
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The last modification of Listing 8-3 occurs in the fifth try {} block of Listing 8-7 This is where the record store is deleted The destroy() method is called in this example to release resources used by the RecordEnumeration and thereby having the effect of deleting records in the RecordEnumeration
Listing 8-7 Reading a record of a string data type into a RecordEnumeration
import import import import public {
javaxmicroeditionrms*; javaxmicroeditionmidlet*; javaxmicroeditionlcdui*; javaio*; class RecordEnumerationExample extends MIDlet implements CommandListener
private Display display; private Alert alert; private Form form; private Command exit; private Command start; private RecordStore recordstore = null; private RecordEnumeration recordEnumeration = null; public RecordEnumerationExample () { display = DisplaygetDisplay(this); exit = new Command("Exit", CommandSCREEN, 1); start = new Command("Start", CommandSCREEN, 1); form = new Form("RecordEnumeration"); formaddCommand(exit); formaddCommand(start); formsetCommandListener(this); } public void startApp() { displaysetCurrent(form); } public void pauseApp() { } public void destroyApp( boolean unconditional ) { } public void commandAction(Command command, Displayable displayable) {
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if (command == exit) { destroyApp(true); notifyDestroyed(); } else if (command == start) { try { recordstore = RecordStoreopenRecordStore( "myRecordStore", true ); } catch (Exception error) { alert = new Alert("Error Creating", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } try { String outputData[] = {"First Record", "Second Record", "Third Record"}; for (int x = 0; x < 3; x++) { byte[] byteOutputData = outputData[x]getBytes(); recordstoreaddRecord(byteOutputData, 0, byteOutputDatalength); } } catch ( Exception error) { alert = new Alert("Error Writing", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } try { StringBuffer buffer = new StringBuffer();
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recordEnumeration = recordstoreenumerateRecords(null, null, false); while (recordEnumerationhasNextElement()) { bufferappend(new String(recordEnumerationnextRecord())); bufferappend("\n"); } alert = new Alert("Reading", buffertoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } catch (Exception error) { alert = new Alert("Error Reading", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } try { recordstorecloseRecordStore(); } catch (Exception error) { alert = new Alert("Error Closing", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } if (RecordStorelistRecordStores() != null) { try { RecordStoredeleteRecordStore("myRecordStore"); recordEnumerationdestroy(); } catch (Exception error) { alert = new Alert("Error Removing", errortoString(), null, AlertTypeWARNING);
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