Message-ID:	<33DFC0C2.4B1@lr.net>
Date:	Wed, 30 Jul 1997 18:31:30 -0400
From:	Isaac Waldron <waldroni AT lr DOT net>
Reply-To:	waldroni AT lr DOT net
Organization:	The Computer Nerd
MIME-Version:	1.0
To:	Jan Hubicka <hubicka AT ta DOT jcu DOT cz>
CC:	djgpp AT delorie DOT com
Subject:	Re: Keys
References:	<Pine DOT LNX DOT 3 DOT 91 DOT 970729164417 DOT 19687A-100000 AT tabor DOT ta DOT jcu DOT cz>

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Jan Hubicka wrote:
> 
> Hi. I need to know ascii codes of pressed keys. But I also need to be
> informed about ther release. Whats the easiest way to do this?
> 
> Honza
> 
> ------------------------------------------------------------------------------
>                    Have you browsed my www pages? Look at:
>                        http://www.paru.cas.cz/~hubicka
>       Koules-the game for Svgalib,X11 and OS/2,  Xonix-the game for X11
>       czech documentation for linux index, original 2D computer art and
>               funny 100 years old photos and articles are there!

Attached is my keyboard.h keypress handler.  The code is not documented
well, but is pretty simple.  Basically, you call install_keyboard() at
the beginning and remove_keyboard() at the end.  To check for a
keypress, just use an if statement, like this:

if (key[KEY_ENTER])
{
	call functions here.
};

BTW, key is an array that is indexed by any one of the defined key
codes, so key[<key define>] is 1 if the key is down, and 0 if it is not
pressed.

Hope this helps.

-- 
-Begin Signature-
Isaac Waldron <waldroni AT lr DOT net> N1YZI
http://www.geocities.com/SiliconValley/Lakes/5703/home.html
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/*
keyboard.h

A C++ header with functions that override the BIOS keayboard handler

Author: Isaac Waldron
*/

#include <dos.h>
#include <dpmi.h>
#include <go32.h>

#define KEYBOARD_INT 0x09
#define KEY_BUFFER 0x60
#define KEY_CONTROL 0x61
#define INT_CONTROL 0x20
#define KEY_ESC 1        /* keyboard scan codes */
#define KEY_1 2 
#define KEY_2 3 
#define KEY_3 4
#define KEY_4 5
#define KEY_5 6
#define KEY_6 7
#define KEY_7 8
#define KEY_8 9
#define KEY_9 10
#define KEY_0 11
#define KEY_MINUS 12
#define KEY_EQUALS 13
#define KEY_BACKSPACE 14
#define KEY_TAB 15 
#define KEY_Q 16
#define KEY_W 17
#define KEY_E 18
#define KEY_R 19
#define KEY_T 20
#define KEY_Y 21
#define KEY_U 22
#define KEY_I 23
#define KEY_O 24
#define KEY_P 25
#define KEY_OPENBRACE 26
#define KEY_CLOSEBRACE 27
#define KEY_ENTER 28
#define KEY_CTRL 29
#define KEY_A 30
#define KEY_S 31
#define KEY_D 32
#define KEY_F 33
#define KEY_G 34
#define KEY_H 35
#define KEY_J 36
#define KEY_K 37
#define KEY_L 38
#define KEY_COLON 39
#define KEY_QUOTE 40
#define KEY_TILDE 41
#define KEY_LSHIFT 42
#define KEY_Z 44
#define KEY_X 45
#define KEY_C 46
#define KEY_V 47
#define KEY_B 48
#define KEY_N 49
#define KEY_M 50
#define KEY_COMMA 51
#define KEY_STOP 52
#define KEY_SLASH 53
#define KEY_RSHIFT 54
#define KEY_ASTERISK 55
#define KEY_ALT 56
#define KEY_SPACE 57
#define KEY_CAPSLOCK 58
#define KEY_F1 59
#define KEY_F2 60
#define KEY_F3 61
#define KEY_F4 62
#define KEY_F5 63
#define KEY_F6 64
#define KEY_F7 65
#define KEY_F8 66
#define KEY_F9 67
#define KEY_F10 68
#define KEY_NUMLOCK 69
#define KEY_SCRLOCK 70
#define KEY_HOME 71
#define KEY_UP 72
#define KEY_PGUP 73
#define KEY_MINUS_PAD 74
#define KEY_LEFT 75
#define KEY_5_PAD 76
#define KEY_RIGHT 77
#define KEY_PLUS_PAD 78
#define KEY_END 79
#define KEY_DOWN 80
#define KEY_PGDN 81
#define KEY_INSERT 82
#define KEY_DEL 83
#define KEY_F11 87
#define KEY_F12 88
#define BREAK 128 //Key "no-longer pressed" code

unsigned char key[128];
_go32_dpmi_seginfo Old_KeyBoard;
_go32_dpmi_seginfo sinfo;

void key_handler(void)
{
        unsigned char temp, keyCode;
        keyCode = inp(KEY_BUFFER);
        temp = inp(KEY_CONTROL);
        temp = temp | 0x82;
        outp(KEY_CONTROL, temp);
        temp = temp & 0x7f;
        outp(KEY_CONTROL, temp);
        outp(INT_CONTROL, 0x20);
        if (keyCode > 128)
        {
                key[keyCode - 128] = 0;
        }
        else
        {
                key[keyCode] = 1;
        };
};

void key_handler_lock()
{
};

int install_keyboard(void)
{
        int i;
        for (i = 0; i < 127; i++)
        {
                key[i] = 0;
        };
        _go32_dpmi_lock_data(&key, sizeof(key));
        _go32_dpmi_lock_code(key_handler, (unsigned long)(key_handler_lock - key_handler));
        _go32_dpmi_get_protected_mode_interrupt_vector(KEYBOARD_INT, &Old_KeyBoard);
        sinfo.pm_offset = (long unsigned)&key_handler;
        sinfo.pm_selector = (short unsigned)_my_cs;
        _go32_dpmi_allocate_iret_wrapper(&sinfo);
        _go32_dpmi_set_protected_mode_interrupt_vector(KEYBOARD_INT, &sinfo);
};

void remove_keyboard(void)
{
        _go32_dpmi_set_protected_mode_interrupt_vector(KEYBOARD_INT, &Old_KeyBoard);
        _go32_dpmi_free_iret_wrapper(&sinfo);
};


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