WIN32汇编 怎么实现键盘Ctrl+Alt+Del的屏蔽

[dachidahu]

能否给出具体代码~谢谢了

[dongyi940333]

这是INTER汇编语言程序设计第四版书上的一个例子,用于阻止按CTRL-ALT-DELETE重启.
该程序只能在计算机引导到MS_DOS方式下才能正常工作,WINDOWS禁止TSR程序截取键盘按键.

主要用到INT 21H的功能35H和25H,你自已看一下,初学,不对之处请指出,谢谢

TITLE Reset-Disabling program (No_Reset.asm)

; This program disables the usual DOS reset command
; (Ctrl-Alt-Del), by intercepting the INT 9 keyboard
; hardware interrupt. It checks the shift status bits
; in the MS-DOS keyboard flag and changes any Ctrl-Alt-Del
; to Alt-Del. The computer can only be rebooted by
; typing Ctrl+Alt+Right shift+Del. Assemble, link,
; and convert to a COM program by including the /T
; command on the Microsoft LINK command line.
; Last update: 10/12/01

.model tiny
.code
rt_shift EQU 01h ; Right shift key: bit 0
ctrl_key EQU 04h ; CTRL key: bit 2
alt_key EQU 08h ; ALT key: bit 3
del_key EQU 53h ; scan code for DEL key
kybd_port EQU 60h ; keyboard input port

ORG 100h ; this is a COM program
start:
jmp setup ; jump to TSR installation

; Memory-resident code begins here
int9_handler PROC FAR
sti ; enable hardware interrupts
pushf ; save regs & flags
push es
push ax
push di

; Point ES:DI to the DOS keyboard flag byte:
L1: mov ax,40h ; DOS data segment is at 40h
mov es,ax
mov di,17h ; location of keyboard flag
mov ah,es:[di] ; copy keyboard flag into AH

; Test for the CTRL and ALT keys:
L2: test ah,ctrl_key ; CTRL key held down?
jz L5 ; no: exit
test ah,alt_key ; ALT key held down?
jz L5 ; no: exit

; Test for the DEL and Right-shift keys:
L3: in al,kybd_port ; read keyboard port
cmp al,del_key ; DEL key pressed?
jne L5 ; no: exit
test ah,rt_shift ; right shift key pressed?
jnz L5 ; yes: allow system reset

L4: and ah,NOT ctrl_key ; no: turn off bit for CTRL
mov es:[di],ah ; store keyboard_flag

L5: pop di ; restore regs & flags
pop ax
pop es
popf
jmp cs:[old_interrupt9] ; jump to INT 9 routine

old_interrupt9 DWORD ?

int9_handler ENDP
end_ISR label BYTE

; --------------- (end of TSR program) ------------------
; Save a copy of the original INT 9 vector, and set up
; the address of our program as the new vector. Terminate
; this program and leave the int9_handler procedure in memory.

setup:
mov ax,3509h ; get INT 9 vector
int 21h
mov word ptr old_interrupt9,bx ; save INT 9 vector
mov word ptr old_interrupt9+2,es

mov ax,2509h ; set interrupt vector, INT 9
mov dx,offset int9_handler
int 21h

mov ax,3100h ; terminate and stay resident
mov dx,OFFSET end_ISR ; point to end of resident code
shr dx,4 ; multiply by 16
inc dx ; round upward to next paragraph
int 21h ; execute MS-DOS function
END start