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KEYBOARD.PAS
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KEYBOARD.PAS
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{======================= Keyboard Handler ==========================
Returns the scancode for any pressed key, including ALT, CTRL, SCROLL, NUM etc.
v.0.1 - 10.09.2018 by Jan Knipperts}
Unit Keyboard;
interface
uses dos;
type
Keycfg_type = record
Keyname : string;
Scancode : byte;
end;
var
keydown : byte;
keys : array [0..127] of boolean;
scan,
lastkey : byte;
Procedure initKB;
{Initializes the keyboard handler}
Procedure deinitKB;
{Restores the original handler}
Function GetKeyName(code : byte) : string;
{Returns the key name for the given scancode as string}
Function GetanyKey : byte;
{Returns the scan code of the pressed key. Also works for special keys like ALT, CTRL etc.}
implementation
var oldint : pointer;
procedure INT9; interrupt;
begin
scan := port[$60]; { Get Scancode }
if scan > $7F then { Key released ? }
begin
if keys[scan xor $80] then
dec(keydown);
keys[scan xor $80] := false; {Yes !}
end
else
begin
if not keys[scan] then
inc(keydown);
keys[scan] := true; {NO ! Key pressed }
lastkey := scan;
end;
port[$20] := $20; { Send EndOfInterrupt to Interruptcontroller }
end;
procedure initKB;
var
i : byte;
begin
for i := 0 to 127 do
keys[i] := false; {No keys pressed}
keydown := 0;
getintvec(9, oldint);
setintvec(9, @INT9);
end;
procedure deinitKB;
begin
setintvec(9, oldint);
end;
function GetKeyName(code : byte) : string;
begin
case code of
1 : GetKeyname := 'ESC';
2 : GetKeyname := '1';
3 : GetKeyname := '2';
4 : GetKeyname := '3';
5 : GetKeyname := '4';
6 : GetKeyname := '5';
7 : GetKeyname := '6';
8 : GetKeyname := '7';
9 : GetKeyname := '8';
$A : GetKeyname := '9';
$B : GetKeyname := '0';
$C : GetKeyname := '-';
$D : GetKeyname := '=';
$E : GetKeyname := 'BACKSPACE';
$F : GetKeyname := 'TAB';
$10 : GetKeyname := 'Q';
$11 : GetKeyname := 'W';
$12 : GetKeyname := 'E';
$13 : GetKeyname := 'R';
$14 : GetKeyname := 'T';
$15 : GetKeyname := 'Y';
$16 : GetKeyname := 'U';
$17 : GetKeyname := 'I';
$18 : GetKeyname := 'O';
$19 : GetKeyname := 'P';
$1A : GetKeyname := '[';
$1B : GetKeyname := ']';
$1C : GetKeyname := 'ENTER';
$1D : GetKeyname := 'CTRL';
$1E : GetKeyname := 'A';
$1F : GetKeyname := 'S';
$20 : GetKeyname := 'D';
$21 : GetKeyname := 'F';
$22 : GetKeyname := 'G';
$23 : GetKeyname := 'H';
$24 : GetKeyname := 'J';
$25 : GetKeyname := 'K';
$26 : GetKeyname := 'L';
$27 : GetKeyname := ';';
$28 : GetKeyname := '''';
$29 : GetKeyname := '`';
$2A : GetKeyname := 'L SHIFT';
$2B : GetKeyname := '\';
$2C : GetKeyname := 'Z';
$2D : GetKeyname := 'X';
$2E : GetKeyname := 'C';
$2F : GetKeyname := 'V';
$30 : GetKeyname := 'B';
$31 : GetKeyname := 'N';
$32 : GetKeyname := 'M';
$33 : GetKeyname := ',';
$34 : GetKeyname := '.';
$35 : GetKeyname := '/';
$36 : GetKeyname := 'R SHIFT';
$37 : GetKeyname := 'PRINT';
$38 : GetKeyname := 'ALT';
$39 : GetKeyname := 'SPACE';
$3A : GetKeyname := 'CAPS';
$3B : GetKeyname := 'F1';
$3C : GetKeyname := 'F2';
$3D : GetKeyname := 'F3';
$3E : GetKeyname := 'F4';
$3F : GetKeyname := 'F5';
$40 : GetKeyname := 'F6';
$41 : GetKeyname := 'F7';
$42 : GetKeyname := 'F8';
$43 : GetKeyname := 'F9';
$44 : GetKeyname := 'F10';
$45 : GetKeyname := 'NUM';
$46 : GetKeyname := 'SCRL';
$47 : GetKeyname := 'HOME';
$48 : GetKeyname := 'UP';
$49 : GetKeyname := 'PGUP';
$4A : GetKeyname := '-';
$4B : GetKeyname := 'LEFT';
$4C : GetKeyname := 'CENTER';
$4D : GetKeyname := 'RIGHT';
$4E : GetKeyname := '+';
$4F : GetKeyname := 'END';
$50 : GetKeyname := 'DOWN';
$51 : GetKeyname := 'PGDN';
$52 : GetKeyname := 'INS';
$53 : GetKeyname := 'DEL';
$57 : GetKeyname := 'F11';
$58 : GetKeyname := 'F12';
end;
end;
Function GetanyKey : byte;
var res : byte;
begin
res := 0;
repeat
if (keydown > 0) then
begin
repeat;
res := lastkey;
until keydown = 0;
end;
until res <> 0;
GetanyKEy := res;
End; { ReadKey }
end.