linux man page for keyboard_ucallback

keyboard_ucallback(3alleg4)					  Allegro manual				       keyboard_ucallback(3alleg4)

NAME

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

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(3alleg4), readkey(3alleg4), ureadkey(3alleg4), keyboard_callback(3alleg4), keyboard_lowlevel_callback(3alleg4)

Allegro 							   version 4.4.2				       keyboard_ucallback(3alleg4)