我已經(jīng)用Java設(shè)計(jì)了自己的合成器，現(xiàn)在我想將其與Midi鍵盤連接。我在下面的課程搜索所有帶有發(fā)射器的Midi設(shè)備。它成功找到了我的Midi鍵盤。我將自己的接收器添加到每個(gè)設(shè)備的每個(gè)發(fā)送器中，以便它可以接收所有可能的信息。通過閱讀所有幫助文檔和Java文檔，我知道Transmitter將MidiEvents發(fā)送到Receiver，然后由Receiver處理send方法。因此，我編寫了自己的內(nèi)部類來實(shí)現(xiàn)Receiver，并僅使用了一個(gè)println語句來檢查send方法中是否檢測(cè)到任何東西。但是什么也沒撿到。做這種簡(jiǎn)單的事情似乎幾乎沒有幫助，我查看了每個(gè)幫助文件，javadoc和論壇。我敢肯定，這一定是我確實(shí)以某種方式錯(cuò)過的東西。

我的合成器不應(yīng)與界面合成器混淆，它也不是Midi樂器。它使用合成算法并具有回放方法。基本上，我只需要讓Midi鍵盤發(fā)送有關(guān)事件的便箋，便會(huì)調(diào)用播放方法。

import javax.sound.midi.*;

import java.util.ArrayList;

import java.util.List;

import java.io.*;

public class MidiHandler

{

//ArrayList of MidiDevices

private ArrayList devices = new ArrayList();

public MidiHandler()

{

MidiDevice device;

MidiDevice.Info[] infos = MidiSystem.getMidiDeviceInfo();

for (int i = 0; i < infos.length; i++) {

try {

device = MidiSystem.getMidiDevice(infos[i]);

//does the device have any transmitters?

if (device.getTransmitters().size() > 0) {

//if it does, add it to the device list

System.out.println(infos[i] +":" + device.getTransmitters().size());

devices.add(device);

}

} catch (MidiUnavailableException e) {}

}

//if any transmitting devices were found

if(devices.size()>0) {

//for each device

for(int i = 0; i

try {

//get all transmitters

List transmitters = devices.get(i).getTransmitters();

//and for each transmitter

for(int j = 0; j

//create a new receiver

transmitters.get(i).setReceiver(

//using my own MidiInputReceiver

new MidiInputReceiver(devices.get(i).getDeviceInfo().toString())

);

}

//open each device

devices.get(i).open();

//if code gets this far without throwing an exception

//print a success message

System.out.println(devices.get(i).getDeviceInfo()+" Was Opened");

} catch (MidiUnavailableException e) {}

}

}

}

//tried to write my own class. I thought the send method handles an MidiEvents sent to it

public class MidiInputReceiver implements Receiver {

public String name;

public MidiInputReceiver(String name) {

this.name = name;

}

public void send(MidiMessage msg, long timeStamp) {

System.out.println("midi received");

}

public void close() {}

}

}

注意：

我已經(jīng)看到了：Java MIDI-從鋼琴獲取數(shù)據(jù)嗎？

和這個(gè)：http://www.jsresources.org/examples/MidiInDump.html

接口Sequencer看起來也很復(fù)雜，我也想要。

我發(fā)現(xiàn)MidiDevice getTransmitters()似乎返回當(dāng)前已經(jīng)打開的發(fā)送器列表，而不是返回可打開的發(fā)送器。 我相信，通過getTransmitter()方法可以打開一個(gè)新的發(fā)送器。 我已經(jīng)修改了您的代碼以執(zhí)行此操作：

import javax.sound.midi.*;

import java.util.ArrayList;

import java.util.List;

import java.io.*;

public class MidiHandler

{

public MidiHandler()

{

MidiDevice device;

MidiDevice.Info[] infos = MidiSystem.getMidiDeviceInfo();

for (int i = 0; i < infos.length; i++) {

try {

device = MidiSystem.getMidiDevice(infos[i]);

//does the device have any transmitters?

//if it does, add it to the device list

System.out.println(infos[i]);

//get all transmitters

List transmitters = device.getTransmitters();

//and for each transmitter

for(int j = 0; j

//create a new receiver

transmitters.get(j).setReceiver(

//using my own MidiInputReceiver

new MidiInputReceiver(device.getDeviceInfo().toString())

);

}

Transmitter trans = device.getTransmitter();

trans.setReceiver(new MidiInputReceiver(device.getDeviceInfo().toString()));

//open each device

device.open();

//if code gets this far without throwing an exception

//print a success message

System.out.println(device.getDeviceInfo()+" Was Opened");

} catch (MidiUnavailableException e) {}

}

}

//tried to write my own class. I thought the send method handles an MidiEvents sent to it

public class MidiInputReceiver implements Receiver {

public String name;

public MidiInputReceiver(String name) {

this.name = name;

}

public void send(MidiMessage msg, long timeStamp) {

System.out.println("midi received");

}

public void close() {}

}

}

在我的硬件上(我插入了一個(gè)簡(jiǎn)單的USB MIDI控制器)，在創(chuàng)建MidiHandler實(shí)例之后，該代碼可以正確打印出" midi receive"。

希望這可以幫助！

非常感謝！ 這確實(shí)可行，并且代碼也較少混淆。

我發(fā)現(xiàn)您必須在調(diào)用setRecceiver()之前打開設(shè)備，否則從上次運(yùn)行該應(yīng)用程序起，將使用任何垃圾MIDI數(shù)據(jù)調(diào)用接收方的send()方法。

device.open();

Transmitter trans = device.getTransmitter();

// set new receiver after opening so that the input buffer will be flushed

trans.setReceiver(new MidiInputReceiver(device.getDeviceInfo().toString()));

在添加接收器之前打開deviced非常重要

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