如何以编程方式检测linux中大写锁定的状态 [英] How to detect the status of the capslock in linux programmatically

问题描述

我想知道 Capslock 是否处于活动状态，我想我可以使用 xet 为此目的，使用管道，通过 popen('xset -q | grep Capslock') 我能找出来，但我想要一些不使用命令的方法，在 C 程序中，有什么方法可以知道这一点.在这种情况下我还要问一件事，xset 在 linux 的控制台模式下不起作用，我做 alt+ctrl+f1 然后登录那里，如果尝试运行 xset -q 这将抛出错误，也许这无法与控制台中的 XWindows 通信，所以有什么解决方案可以解决这个问题案例.

I want some way to know if the Capslock is active or not, thought I can use xet for this purpose, using pipe, by popen('xset -q | grep Capslock') I am able to find out, but I want some way by which there is no use of the commands, in the C program, is there any way to know this. One more thing I want to ask in this context, xset doens't work in the console mode in linux, I do alt+ctrl+f1 then login there and if try to run xset -q this will throw error, perhaps this can't communicate with the XWindows in console, so what solution can be for this case.

推荐答案

我想知道 Capslock 是否处于活动状态

I want some way to know if the Capslock is active or not

您可能想要 XkbGetIndicatorState.例如:

You probably want XkbGetIndicatorState. For instance:

#include <stdio.h>
#include <stdlib.h>
#include <X11/XKBlib.h>

/* Compile this with -lX11 */

int main ()
{
  Display *display;
  Status status;
  unsigned state;

  display = XOpenDisplay (getenv ("DISPLAY"));
  if (!display)
    return 1;

  if (XkbGetIndicatorState (display, XkbUseCoreKbd, &state) != Success)
    return 2;

  printf ("Caps Lock is %s\n", (state & 1) ? "on" : "off");
  return 0;
}

或者，您可以使用 相同的方法在 xset 中使用 并使用 XkbGetNamedIndicator 这是一个更通用的函数.

Alternatively, you can go with the same approach that is used in xset and use XkbGetNamedIndicator which is a more general function.

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