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学 Win32 汇编[19]: 查看二进制等相关函数

2010-04-13 12:36 447 查看
在 masm32.inc 中有这样几个函数的声明:
byt2bin_ex  PROTO :BYTE, :DWORD
wrd2bin_ex  PROTO :WORD, :DWORD
dw2bin_ex   PROTO :DWORD, :DWORD
dw2hex_ex   PROTO :DWORD, :DWORD
bin2byte_ex PROTO :DWORD


byt2bin_ex: 从 Byte 数到二进制字符串
; Test19_1.asm
.386
.model flat, stdcall

include    windows.inc
include    kernel32.inc
include    masm32.inc
include    debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

.data
szBin db 8 dup(0), 0  ;这是接收二进制字符串的缓冲区
bVal  db 3
.code
main proc
;查看数字的二进制信息
invoke byt2bin_ex, 2, addr szBin
PrintString szBin ;00000010

;查看变量 bVal 的二进制信息
invoke byt2bin_ex, bVal, addr szBin
PrintString szBin ;00000011

;查看寄存器 al 的二进制信息
mov al, 0feh
invoke byt2bin_ex, al, addr szBin
PrintString szBin ;11111110
ret
main endp
end main


wrd2bin_ex: 从 Word 数到二进制字符串
; Test19_2.asm
.386
.model flat, stdcall

include    windows.inc
include    kernel32.inc
include    masm32.inc
include    debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

.data
szBin db 16 dup(0), 0  ;这是接收二进制字符串的缓冲区
wVal  dw 3
.code
main proc
;查看数字的二进制信息
invoke wrd2bin_ex, 2, addr szBin
PrintString szBin ;0000000000000010

;查看变量 wVal 的二进制信息
invoke wrd2bin_ex, wVal, addr szBin
PrintString szBin ;0000000000000011

;查看寄存器 ax 的二进制信息
mov ax, 0fffeh
invoke wrd2bin_ex, ax, addr szBin
PrintString szBin ;1111111111111110
ret
main endp
end main


dw2bin_ex: 从 DWord 数到二进制字符串
; Test19_3.asm
.386
.model flat, stdcall

include    windows.inc
include    kernel32.inc
include    masm32.inc
include    debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

.data
szBin db 32 dup(0), 0  ;这是接收二进制字符串的缓冲区
dwVal dd 3

.code
main proc
;查看数字的二进制信息
invoke dw2bin_ex, 2, addr szBin
PrintString szBin ;00000000000000000000000000000010

;查看变量 dwVal 的二进制信息
invoke dw2bin_ex, dwVal, addr szBin
PrintString szBin ;00000000000000000000000000000011

;查看寄存器 eax 的二进制信息
mov eax, 0fffffffeh
invoke dw2bin_ex, eax, addr szBin
PrintString szBin ;11111111111111111111111111111110
ret
main endp
end main


dw2hex_ex: 从 DWord 数到十六进制字符串
; Test19_4.asm
.386
.model flat, stdcall

include    windows.inc
include    kernel32.inc
include    masm32.inc
include    debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

.data
szHex db 8 dup(0), 0  ;这是接收十六进制字符串的缓冲区
dwVal dd 255
.code
main proc
;查看数字的十六进制信息
invoke dw2hex_ex, 16, addr szHex
PrintString szHex ;00000010

;查看变量 dwVal 的十六进制信息
invoke dw2hex_ex, dwVal, addr szHex
PrintString szHex ;000000FF

;查看寄存器 eax 的十六进制信息
mov eax, 2694881440
invoke dw2hex_ex, eax, addr szHex
PrintString szHex ;A0A0A0A0
ret
main endp
end main


bin2byte_ex: 从字符串(必须有 8 个 '0' 或 '1' 组成)到字节
; Test19_5.asm
.386
.model flat, stdcall

include    windows.inc
include    kernel32.inc
include    masm32.inc
include    debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

.data
szTxt1 db '00000010', 0
szTxt2 db '01111011', 0
szTxt3 db '11111111', 0
.code
main proc
invoke bin2byte_ex, addr szTxt1
PrintDec eax  ;2

invoke bin2byte_ex, addr szTxt2
PrintDec eax  ;123

invoke bin2byte_ex, addr szTxt3
PrintDec eax  ;255
ret
main endp
end main


学习查看二进制是为了看到 EFLAGS 中的二进制位的变化:
; Test19_6.asm
.386
.model flat, stdcall

include    windows.inc
include    kernel32.inc
include    masm32.inc
include    debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

.data
szBin db 8 dup(?), 0
.code
main proc
lahf  ;LAHF 指令是把 EFLAGS 寄存器的低字节读入 AH
invoke byt2bin_ex, ah, addr szBin
PrintString szBin  ;01000110
ret
main endp
end main
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