Java从MIDI键盘获取输入
我用java设计了自己的合成器,现在我想用midi键盘连接它。我下面的课程搜索所有带有发射机的midi设备。它成功地找到了我的midi键盘。我为每个设备的每个发射机添加了自己的接收机,以便它能够接收所有可能的信息。通过阅读所有的帮助文档和java文档,我知道发送器将MIDI事件发送给接收器,然后接收器使用send方法处理这些事件。因此,我编写了自己的内部类实现Receiver,并使用println语句检查send方法中是否检测到任何内容。然而,什么也没有捡到。做这么简单的事情似乎没有什么帮助,我已经查看了每个帮助文件,javadoc和论坛。我确信这一定是我不知何故错过的一件非常明显的事情 我的合成器不应该与接口合成器混淆,它不是midi乐器。它使用合成算法,并具有回放方法。基本上,我只需要让midi键盘发送一个关于事件的注释,该注释将调用回放方法Java从MIDI键盘获取输入,java,input,keyboard,midi,javasound,Java,Input,Keyboard,Midi,Javasound,我用java设计了自己的合成器,现在我想用midi键盘连接它。我下面的课程搜索所有带有发射机的midi设备。它成功地找到了我的midi键盘。我为每个设备的每个发射机添加了自己的接收机,以便它能够接收所有可能的信息。通过阅读所有的帮助文档和java文档,我知道发送器将MIDI事件发送给接收器,然后接收器使用send方法处理这些事件。因此,我编写了自己的内部类实现Receiver,并使用println语句检查send方法中是否检测到任何内容。然而,什么也没有捡到。做这么简单的事情似乎没有什么帮助,我
import javax.sound.midi.*;
import java.util.ArrayList;
import java.util.List;
import java.io.*;
public class MidiHandler
{
//ArrayList of MidiDevices
private ArrayList<MidiDevice> devices = new ArrayList<MidiDevice>();
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<devices.size(); i++) {
try {
//get all transmitters
List<Transmitter> transmitters = devices.get(i).getTransmitters();
//and for each transmitter
for(int j = 0; j<transmitters.size();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() {}
}
}
导入javax.sound.midi.*;
导入java.util.ArrayList;
导入java.util.List;
导入java.io.*;
公共类MIDI处理程序
{
//MIDI设备的阵列列表
私有ArrayList设备=新建ArrayList();
公共middhandler()
{
MIDI设备;
MidiDevice.Info[]infos=MidiSystem.getMidiDeviceInfo();
for(int i=0;i0){
//如果有,请将其添加到设备列表中
System.out.println(infos[i]+“:“+device.getTransmitters().size());
设备。添加(设备);
}
}catch(MidiUnavailableException{}
}
//如果发现任何发射装置
如果(devices.size()>0){
//对于每个设备
对于(int i=0;i我发现MIDI设备getTransmitter()似乎返回当前已打开的发射机列表,而不是要打开的可用发射机列表。我相信打开新发射机的方法是通过getTransmitter()方法。我修改了您的代码以实现此目的:
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<Transmitter> transmitters = device.getTransmitters();
//and for each transmitter
for(int j = 0; j<transmitters.size();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() {}
}
}
导入javax.sound.midi.*;
导入java.util.ArrayList;
导入java.util.List;
导入java.io.*;
公共类MIDI处理程序
{
公共middhandler()
{
MIDI设备;
MidiDevice.Info[]infos=MidiSystem.getMidiDeviceInfo();
for(int i=0;i 对于(int j=0;j我发现在调用setRecceiver()之前必须先打开设备,否则将使用上次运行应用程序时的任何垃圾MIDI数据调用接收方的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()));
非常感谢!这确实有效,而且代码也不太复杂。在添加接收器之前打开Device非常重要