C# 多个键盘和低级钩子
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Multiple keyboards and low-level hooks
提问by Ray Hayes
I have a system where I have multiple keyboards and really need to know which keyboard the key stroke is coming from. To explain the set up:
我有一个系统，我有多个键盘，真的需要知道击键来自哪个键盘。解释设置：
- I have a normal PC and USB keyboard
- I have an external VGA screen with some hard-keys
- The hard keys are mapped as a standard USB keyboard, sending a limited number of key-codes (F1, F2, Return, + and -)
- 我有一台普通的 PC 和 USB 键盘
- 我有一个带有一些硬键的外置 VGA 屏幕
- 硬键映射为标准 USB 键盘，发送有限数量的键码（F1、F2、Return、+ 和 -）
I have a low-level hook (in C# but actually calling upon Win32 functionality) which is able to deal with the input even when my application is not focused.
我有一个低级挂钩（在 C# 中，但实际上调用了 Win32 功能），即使我的应用程序没有获得焦点，它也能够处理输入。
The problem is that when using the normal keyboard, some of the mapped key-codes at picked up by the application being driven on the external screen. One of the key-presses sent by the external screen and used for confirmation is VK_RETURN. Unless I can identify the "device" and filter upon it, the user could be performing actions and confirming them on a screen their not even looking at.
问题是，当使用普通键盘时，一些映射的键码会被外部屏幕上的应用程序所驱动。外部屏幕发送的用于确认的按键之一是 VK_RETURN。除非我可以识别“设备”并对其进行过滤，否则用户可能正在执行操作并在他们甚至不看的屏幕上确认它们。
How do I know which keyboard was responsible for the key-press?
我怎么知道哪个键盘负责按键？
采纳答案by Roel
Yes I stand corrected, my bad, learning something new every day.
是的，我站得更正，我的坏，每天都在学习新东西。
Here's my attempt at making up for it :) :
这是我弥补它的尝试:)：
Register the devices you want to use for raw input (the two keyboards) with ::RegisterRawInputDevices().
You can get these devices from GetRawInputDeviceList()
After you've registered your devices, you will start getting WM_INPUT messages.
The lParam of the WM_INPUT message contains a RAWKEYBOARD structure that you can use to determine the keyboard where the input came from, plus the virtual keycode and the type of message (WM_KEYDOWN, WM_KEYUP, ...)
So you can set a flag of where the last message came from and then dispatch it to the regular keyboard input handlers.
使用 ::RegisterRawInputDevices() 注册要用于原始输入的设备（两个键盘）。
您可以从 GetRawInputDeviceList() 获取这些设备
注册设备后，您将开始收到 WM_INPUT 消息。
WM_INPUT 消息的 lParam 包含一个 RAWKEYBOARD 结构，您可以使用它来确定输入来自哪个键盘，以及虚拟键码和消息类型（WM_KEYDOWN、WM_KEYUP，...）
因此，您可以设置最后一条消息来自何处的标志，然后将其分派到常规键盘输入处理程序。
回答by Roel
No way to do this. Windows abstracts this for you. As mentioned, you need to write/modify a device driver.
没有办法做到这一点。Windows 为您抽象了这一点。如前所述，您需要编写/修改设备驱动程序。
