package demo;
import javax.microedition.lcdui.Graphics;
import javax.microedition.rms.RecordStore;

public class MyRecord{
	private int m_nCurRecord	= 0;	//當前得分
	private int m_nHighRecord = 0;		//歷史最高得分
	private String m_strName;			//RMS系統中數據表的名稱
	
	//構造方法，參數strName為存儲數據的表單名稱
	public MyRecord( String strName ){
		m_strName = strName;
		Load();
	}
	//獲取當前得分
	public int getCurRecord(){
		return m_nCurRecord;
	}
	//設置當前得分
	public void setCurRecord( int record ){
		m_nCurRecord = record;
		//如果當前得分高于歷史最高分，則保存
		if( m_nHighRecord < m_nCurRecord ){
			m_nHighRecord = m_nCurRecord;	
			Save();
		}
	}
	//存儲歷史最高分
	public void Save(){
		try{			
			byte b[] = new byte[4];
			int temp = m_nHighRecord;
			//將int型數據，保存到byte數組
			for(int i = b.length - 1; i >= 0; i--){
				b[i] = new Integer(temp & 0xff).byteValue();
				temp = temp >> 8;
			}			
			//打開RecordStore，沒有則新建			
			RecordStore rs = RecordStore.openRecordStore(
					m_strName,true);			
			if( rs.getNumRecords() > 0 ){	//如果記錄數大于0
				rs.setRecord(1, b, 0, b.length);  //更改第一條記錄
			}			
			else{     
				//如果沒有記錄，則添加記錄	
				rs.addRecord(b,0,b.length);	
			}		
			rs.closeRecordStore();
		}	
		catch (Exception ex){}	
	}	
	//讀取歷史最高分
	public boolean Load(){
		try{			
			RecordStore rs = 
				RecordStore.openRecordStore( m_strName, false);			
			byte b[] = rs.getRecord(1);
			m_nHighRecord = 0;
			for (int i = 0; i < 3; i++){
				//如果b[i]小于0,則將b[i]轉換成相應的正數
				if( b[i] < 0 )	
					m_nHighRecord += ( b[i] + 256 );
				else
					m_nHighRecord += b[i];	
				m_nHighRecord *= 256;	
			}					
			m_nHighRecord += b[3];	
			if( b[3] < 0 )	
				m_nHighRecord += 256;				
			rs.closeRecordStore();
		}
		catch (Exception ex){
			return false;
		}
		return true;		
	}
	//顯示歷史最高分記錄
	//參數g對應手機屏幕，scrWidth與scrHeight分別是屏幕的寬與高
	public void Paint( Graphics g, int scrWidth, int scrHeight ){
		StringBuffer buffer = new StringBuffer();
		buffer.append("歷史最高分：");
		buffer.append(m_nHighRecord);	
		int x = scrWidth / 2;
		int y = scrHeight / 2 - 20;
		g.drawString(buffer.toString(), x, y, 
				Graphics.TOP|Graphics.HCENTER );
		
		buffer.delete(0,buffer.length());
		buffer.append("本次得分：");
		buffer.append(m_nCurRecord);
		y = y + 40;
		g.drawString(buffer.toString(), x, y, 
				Graphics.TOP|Graphics.HCENTER );
	}
}