要解决这个问题，你需要做一些事情:

A way to capture MIDI data from your keyboard. Depending upon the interface: MIDI interface (classic) or USB MIDI interface (modern) the most likely interface is to a computer as it provides the most options. USB host microcontrollers are not as simple as just using a computer. A scheme to convert MIDI data into keystrokes. Like one user pointed out, chords are the way to go as the number of keys will not be dependent upon the number of piano keys. A way to inject a key into the operating system. This will require a low-level driver to be accurate. I have played around with applications that inject keyboard and mouse data into applications in Windows 7, and it can be flaky and depend upon whether an application is currently in focus. This is hardest part of the interface. What may work is to create a HID USB keyboard microcontroller that also has a serial interface.

串行接口将创建一个虚拟串行端口。读取MIDI数据并产生击键的软件可以向虚拟串行端口发送一个串行消息。微控制器将发送一个击键，使它看起来像一个标准的键盘输入。这将允许同时连接MIDI端口和USB MIDI键盘。

Hmmm, with this type of interface you could also simulate a mouse and use some piano keys setup for the mouse axis and buttons. The pressure could be used to determine mouse pointer velocity. So you could eliminate the mouse as well. Another benefit of this approach is any type of input device you connect could talk to the virtual serial port to produce keyboard and mouse events. So if you wanted to add other hardware such as drum pedals or a joystick it would be a matter of adjusting the program that talks to the serial interface.

Another take on the above is like some posted above to use an Arduino, but also include USB Host Shield from Sparkfun to handle USB based music keyboards. This allows the Arduino to be programmed as a keyboard or keyboard mouse combo in the boot loader chip and allows the device to act a USB host for the USB based music keyboard. Then you are covered for both types. Although, I still think the virtual serial port method is more flexible and would be easier to program in the long run. The Arduino device will be harder to change than a desktop program or service.

还有另一种可能: 单手和弦键盘已经存在。我看过关于它们的视频，但你必须确定它们是否会伤害你的手。

试试Bome的MIDI翻译器。

它可以跨平台工作，可以轻松地将任何MIDI输入转换为键盘，快速设置和配置，另外它是免费的个人使用。

有一个教程，快速提示:MIDI翻译- MIDI键击，如何轻松设置:

基本上，你可以做的事情有无限的可能性，包括和弦和修饰键。我用它作为我的现场音频设备来控制我的DAW使用我的钢琴，从来没有遇到过问题。

以MAME街机游戏为例。他们已经建立了硬件设备，允许输入任意数量的不同项目。例如，iPac将输入设备的信号转换为USB，然后计算机可以使用USB来模拟按键。您可以使用任意组合的输入设备，只要不需要疯狂的编程逻辑就可以，因为解释输入的软件已经完成并经过了良好的测试。

我见过飞行模拟器座舱输入，自定义亭，和投票系统建立在这种方法.....而且价格也很合理!

如果你懂Java编程，你可以这样使用:

首先，实现一个javax.sound.midi.Receiver，使用send(..)方法将“Note on”事件映射到你想要的击键。

您需要使用它的getMessage方法获取MidiMessage的内容，并按照您的方式解释它。消息字节的含义可以在MIDI消息中找到。

在接收到某个键盘键的'note on'或'note off'后，您可以通过为它分配KeyEvent类的常量将其映射到您喜欢的键，例如c# 4 -> KeyEvent。VK_A等等。然后，java.awt可以使用这个键代码。Robot的keyPress和keyRelease方法实际发送击键到操作系统，从而发送到其他应用程序。

我同意Brian O'Dell的回答——如果这是我的项目，我会用硬件来做。它的优点是与平台和硬件无关——你的盒子取代了对MIDI-USB接口和PC API的需求。

mbed是一个非常容易学习的快速原型平台，与Arduino IMHO相比具有多种优势(在线编译器，512 KB闪存，96 MHz, c++语言)。它有一个USB键盘接口和一个预先为您编写的USB Midi接口。

社区是非常友好和愿意帮助的，有很多现有的项目同时使用MIDI和USB隐藏仿真-搜索Youtube“mbed MIDI”或类似的。

使用. net DirectSound接口这样的东西来连接到MIDI设备应该是相当容易的。您需要识别目标MIDI设备，然后获取用于侦听传入消息的代码(有关于通过谷歌进行此操作的文章)。

由于您正在使用MIDI in作为键盘，因此基本上只需要检测两个MIDI消息，即打开和关闭。MIDI消息是三个数据字节，指定命令、音符和速度。note off只是音符号(有时“坏”MIDI堆栈以零速度发送音符，这也是你必须预料到的)。

一旦你有了转换它们的消息，从。net输出的键盘应该相当简单。

其他答案中有很多关于技术细节的建议;我只是想让你对实际的MIDI消息有一个概念。好运！