Read and Write to RMS Using J2ME

[wa7edmenelnass]

This Application specially tries to explain how to read and write the data using RecordStore class. In the RecordStore class the following methods are available:




addRecord(byte[] data, int offset, int numBytes)

addRecordListener(RecordListener listener)

closeRecordStore()

deleteRecord(int recordId)

deleteRecordStore(String recordStoreName)

enumerateRecords(RecordFilter filter, RecordComparator comparator, boolean keepUpdated)


getLastModified()

getName()

getNextRecordID()
getNumRecords()
getRecord(int recordId)

getRecord(int recordId, byte[] buffer, int offset)

getRecordSize(int recordId)
getSize()
getSizeAvailable()
getVersion()
listRecordStores()
openRecordStore(String recordStoreName, boolean createIfNecessary)
removeRecordListener(RecordListener listener)
setRecord(int recordId, byte[] newData, int offset, int numBytes)








The Application is as follows:
http://www.roseindia.net/j2me/readwriterms.gif
http://www.roseindia.net/j2me/consolereadwriterms.gif


import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import javax.microedition.rms.*;

public class ReadWriteRMS extends MIDlet{
private RecordStore rs = null;
static final String REC_STORE = "ReadWriteRMS";

public void startApp(){
openRecStore();
writeRecord("Core J2ME Technology");
writeRecord("J2ME Wireless Toolkit");
readRecords();
closeRecStore();
deleteRecStore();
}

public void pauseApp(){}

public void destroyApp(boolean unconditional){
notifyDestroyed();
}

public void openRecStore(){
try{
rs = RecordStore.openRecordStore(REC_STORE, true );
}catch (Exception e){}
}

public void closeRecStore(){
try{
rs.closeRecordStore();
}catch (Exception e){}
}

public void deleteRecStore(){
if (RecordStore.listRecordStores() != null){
try{
RecordStore.deleteRecordStore(REC_STORE);
}catch (Exception e){}
}
}

public void writeRecord(String str){
byte[] rec = str.getBytes();
try{
rs.addRecord(rec, 0, rec.length);
}catch (Exception e){}
}

public void readRecords(){
try{
byte[] recData = new byte[5];
int len;

for(int i = 1; i <= rs.getNumRecords(); i++){
if(rs.getRecordSize(i) > recData.length){
recData = new byte[rs.getRecordSize(i)];
}
len = rs.getRecord(i, recData, 0);
System.out.println("------------------------------");
System.out.println("Record " + i + " : " + new String(recData, 0, len));
System.out.println("------------------------------");
}
}catch (Exception e){}
}
}


The Code is in the Attachments