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Docs » Autodocs » lowlevel.library » AddKBInt
AddKBInt -- adds a routine to the keyboard interrupt. (V40)
intHandle = AddKBInt(intRoutine, intData);
D0 A0 A1
APTR AddKBInt(APTR, APTR);
This routine extends the functionality of the keyboard interrupt to
include intRoutine. Since this is an extention of the normal
keyboard interrupt all of the keyboard handshaking is handled. The
keyboard error codes are filtered out and not passed to intRoutine.
The routine is called whenever the user enters a key on the
keyboard.
The routine is called from within an interrupt, so normal
restrictions apply. The routine must preserve the following
registers: A2, A3, A4, A7, D2-D7. Other registers are
scratch, except for D0, which MUST BE SET TO 0 upon
exit. On entry to the routine, A1 holds 'intData' and A5
holds 'intRoutine', and D0 contains the rawkey code read
from the keyboard.
The routine is not called when a reset is received from the
keyboard.
This is a low level function that does not fit the normal Amiga
multitasking model. The interrupt installed will have no knowledge
of which window/screen currently has input focus.
If your program is to exit without reboot, you MUST call RemKBInt()
before exiting.
Only one interrupt routine may be added to the system. ALWAYS
check the return value in case some other task has previously
used this function.
intRoutine - the routine to invoke every vblank. This routine should
be as short as possible to minimize its effect on overall
system performance.
intData - data passed to the routine in register A1. If more than one
long word of data is required this should be a pointer to
a structure that contains the required data.
intHandle - a handle used to manipulate the interrupt, or NULL
if it was not possible to attach the routine.
RemKBInt()
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