[問題] 只能發出同一種樂器的同一個音
大家好
我在練習"深入淺出"書中的範例 "MiniMusicCmdLine"
但是照著書本打完並輸入不同參數(包含樂器種類和音符)後
卻只有跑出同一種樂器(應該是鋼琴?)的同一個音
並且有出現WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at
root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5'
不確定跟這個Warning是否有關
好像要更動regedit的東西才能改善這個Warning，但聽說有風險，所以還沒嘗試
謝謝大家
程式碼如下:
import javax.sound.midi.*;
public class MiniMusicCmdLine {
public static void main(String[] args) {
MiniMusicCmdLine mini = new MiniMusicCmdLine();
if(args.length < 2){
System.out.println("Balabalabala");
}else{
int instrument = Integer.parseInt(args[0]);
int note = Integer.parseInt(args[1]);
mini.play(instrument, note);
}
}
public void play(int instrument, int note){
try{
Sequencer player = MidiSystem.getSequencer();
player.open();
Sequence seq = new Sequence(Sequence.PPQ, 4);
Track track = seq.createTrack();
MidiEvent event = null;
ShortMessage first = new ShortMessage();
first.setMessage(192, 1, instrument, 0);
MidiEvent changeInstrument = new MidiEvent(first,1);
track.add(changeInstrument);
ShortMessage a = new ShortMessage();
a.setMessage(144, 1, note, 100);
MidiEvent noteOn = new MidiEvent(a,1);
track.add(noteOn);
ShortMessage b = new ShortMessage();
a.setMessage(128, 1, note, 100);
MidiEvent noteOff = new MidiEvent(b,16);
track.add(noteOff);
player.setSequence(seq);
player.start();
Thread.sleep(5000);
player.close();
System.exit(0);
}catch (Exception ex){
ex.printStackTrace();
}
}
}
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05/31 09:37, , 1F
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