How can I refresh keycode to keysym mapping?

[Edward]

Hi all,
 
I want to get keysym with XKeycodeToKeysym method, but I found when I change keyboard layout using setxkbmap –layout 
in another process, The XKeycodeToKeysym return the old layout keysym.
 
For example:
Firstly, I run “setxkbmap –layout us”. I get “z” for XKeycodeToKeysym(disply, 52,0), then I run “setxkbmap –layout de” in 
another process I also get “z” for XKeycodeToKeysum(display, 52,0). I think it should return “y”. It seems that I omit to update 
key mapping, but I don’t know how to update it immediately in my code. 


Any idea is welcome.

 
Thank you in advance.
 
BR,
 
Edward.
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