本文介绍了我如何将Midi消息发送到特定的Midi端口的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想将Note_On消息发送到名为LoopBe的虚拟Midi接口(链接到站点).如何获取Receiver对象(Java)?我尝试了下面的代码，但在rcvr.send()上收到了NullPointerException.
I want to send Note_On Message to a virtual Midi Interface called LoopBe (Link to Site). How do i get the Receiver object (Java)?I tried the Code below but I get a NullPointerException on rcvr.send().
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());
}
}
}
}
我尝试了rcvr = MidiSystem.getReceiver()，它起作用了，但是它将消息发送到com.sun.media.sound.MidiOutDevice$MidiOutReceiver@404b9385.
I tried rcvr = MidiSystem.getReceiver() and it worked, but it sends the message to com.sun.media.sound.MidiOutDevice$MidiOutReceiver@404b9385.
推荐答案
您应打开设备，然后再使用它.
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