1install_keyboard(3)             Allegro manual             install_keyboard(3)
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NAME

6       install_keyboard - Installs the Allegro keyboard interrupt handler.
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SYNOPSIS

9       #include <allegro.h>
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12       int install_keyboard();
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DESCRIPTION

15       Installs  the  Allegro  keyboard  interrupt handler. You must call this
16       before using any of the keyboard input routines. Once you have  set  up
17       the  Allegro handler, you can no longer use operating system calls or C
18       library functions to access the keyboard.
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20       Note that on some platforms the keyboard won't work unless you have set
21       a  graphics  mode, even if this function returns a success value before
22       calling set_gfx_mode. This can happen in environments with graphic win‐
23       dowed  modes,  since  Allegro  usually  reads  the keyboard through the
24       graphical window (which appears after the set_gfx_mode call). Example:
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26          allegro_init();
27          install_timer();
28          install_keyboard();
29          /* We are not 100% sure we can read the keyboard yet! */
30          if (set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0) != 0)
31             abort_on_error("Couldn't set graphic mode!");
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33          /* Now we are guaranteed to be able to read the keyboard. */
34          readkey();
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RETURN VALUE

37       Returns zero on success, or a negative number on failure (but  you  may
38       decide  not to check the return value as this function is very unlikely
39       to fail).
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SEE ALSO

43       remove_keyboard(3),  poll_keyboard(3),  key(3),  keypressed(3),   read‐
44       key(3),  ureadkey(3), keyboard_callback(3), keyboard_ucallback(3), key‐
45       board_lowlevel_callback(3),   three_finger_flag(3),    key_led_flag(3),
46       set_leds(3), set_keyboard_rate(3), set_gfx_mode(3)
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50Allegro                          version 4.2.2             install_keyboard(3)
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