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.
I want some way to know if the Capslock is active or not
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;
Status ok = XkbGetIndicatorState (display, XkbUseCoreKbd, &state);
XCloseDisplay (display);
if (ok != Success)
return 2;
printf ("Caps Lock is %s\n", (state & 1) ? "on" : "off");
return 0;
}
Alternatively, you can go with the same approach that is used in xset and use XkbGetNamedIndicator
which is a more general function. (Since Linux 1.1.54 the indicator lights and the key state can be changed independently, but you can generally expect them to match.)