byte[] data = new byte[size];
sheet.serialize(0, data);
EventRecordFactory erf = new EventRecordFactory();
MyIndexRecordListener myIndexListener = new MyIndexRecordListener();
erf.registerListener(myIndexListener, new short[] { IndexRecord.sid, });
erf.processRecords(new ByteArrayInputStream(data));
IndexRecord indexRecord = myIndexListener.getIndexRecord();
int dbCellRecordPos = indexRecord.getDbcellAt(0);
return dbCellRecordPos;
}