如何在不实际打开大写锁定的情况下打开键盘的大写锁定灯? [英] Way to turn on keyboard's caps-lock light without actually turning on caps-lock?

问题描述

我正在编写一个使用大写锁定作为拨动开关的程序.设置键的LED来显示我的程序是打开还是关闭，就像Capslock键自然起作用一样.

I'm writing a program that uses caps-lock as a toggle switch. It would be nice to set the LED of the key to show that my program is on or off, like the capslock key does naturally.

我知道我可以按SendInput('Capslock');或任何实际打开和关闭大写锁定的功能.但是我的应用程序是一个打字程序，我不需要处理翻译全大写字母的键，只要打开它们就可以将我变成大写或小写字母.我可能最终会走那条路，但不是这个版本.

I know that I could just SendInput('Capslock'); or whatever to actually turn caps-lock on and off. But my app is a typing program, and I don't want to have to deal with translating the all-caps keys that turning it on would give me into their lower/upper cases. I might go that route eventually, but not for this version.

但是我只想打开LED灯，而实际上没有打开大写锁定.有什么办法吗?

I would however be interested in just turning on the LED light WITHOUT actually turning on caps-lock. Is there any way to do that?

谢谢.

推荐答案

Miranda IM的插件名为"

There are plugin for Miranda IM named "Keyboard Notify Ext." which contains in its source code C implementation of controlling leds. See file keyboard.c in source. Probably you can port it to C#.

以下是源代码中最有趣的亮点:

Here are most interesting highlights from source code:

mir_snprintf(aux1, sizeof(aux1), "Kbd%d", i);
mir_snprintf(aux2, sizeof(aux2), "\\Device\\KeyboardClass%d", i);
DefineDosDevice(DDD_RAW_TARGET_PATH, aux1, aux2);

mir_snprintf(aux1, sizeof(aux1), "\\\\.\\Kbd%d", i);
hKbdDev[i] = CreateFile(aux1, GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);

...

result |= DeviceIoControl(hKbdDev[i], IOCTL_KEYBOARD_SET_INDICATORS, &InputBuffer, DataLength, NULL, 0, &ReturnedLength, NULL);

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