学 Win32 汇编[19]: 查看二进制等相关函数

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