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Man Pages


Manual Reference Pages  -  KEYBOARD_UCALLBACK (3)

NAME

keyboard_ucallback - User specified unicode keyboard callback handler. Allegro game programming library.

CONTENTS

Synopsis
Description
See Also

SYNOPSIS

#include <allegro.h>

extern int (*keyboard_ucallback)(int key, int *scancode);

DESCRIPTION

Unicode-aware version of keyboard_callback(). If set, this function is called by the keyboard handler in response to every keypress. It is passed the character value and scancode that are about to be added into the input buffer, can modify the scancode value, and returns a new or modified key code. If it both sets the scancode to zero and returns zero, the keypress will be ignored. This routine executes in an interrupt context, so it must be in locked memory. Example:

   int silence_g_key(int key, int *scancode)
   {
      if (key == ’g’) {
         *scancode = 0;
         return 0;
      }
      return key;
   } END_OF_FUNCTION(silence_g_key)
  
   ...
  
      install_timer();
      LOCK_FUNCTION(silence_g_key);
      install_keyboard();
      keyboard_ucallback = silence_g_key;

Note that this keyboard callback has priority over the non unicode callback. If you set both, only the unicode one will work.

SEE ALSO

install_keyboard(3), readkey(3), ureadkey(3), keyboard_callback(3), keyboard_lowlevel_callback(3)
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Allegro KEYBOARD_UCALLBACK (3) version 4.4.2

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