如何将 Midi 消息发送到特定的 Midi 端口

Question

我想发送 Note_On 消息到一个名为 LoopBe (Link to Site) 的虚拟 Midi 接口。我如何获得接收者对象 (Java)？我尝试了下面的代码，但在 rcvr.send().

上出现了 NullPointerException

public class test {

public static Receiver rcvr;

public static void main(String[] args) throws InvalidMidiDataException, MidiUnavailableException {
    String scene = "Test";
    getReceiver();
    ShortMessage myMsg = new ShortMessage();
    // Nachricht Channel Note Lautstärke
    myMsg.setMessage(ShortMessage.NOTE_ON, 0, 1, 127);
    rcvr.send(myMsg, -1);
    System.out.println("Szene " + scene + " ausgelöst");
}

public static void getReceiver() throws MidiUnavailableException {
    MidiDevice.Info[] infos = MidiSystem.getMidiDeviceInfo();
    for(Info devices : infos )
    {
        System.out.println(devices.getName() + " : " + devices.getDescription());
        if(devices.getName() == "LoopBe Internal MIDI" && devices.getDescription() == "No details available") {
            MidiDevice device = MidiSystem.getMidiDevice(devices); 
            rcvr =  device.getReceiver();
            System.out.println("Receiver: " + rcvr.toString());
        }
    }
  }
}

我试过 rcvr = MidiSystem.getReceiver() 并且成功了，但它会将消息发送到 com.sun.media.sound.MidiOutDevice$MidiOutReceiver@404b9385。

Answer 1

您应该 open 使用设备。

如何将 Midi 消息发送到特定的 Midi 端口

How can i send a Midi Message to a specific Midi Port

java

midi

javasound