view byte by byte through OutputDebugString

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sleepsleep

Joined: 05 Oct 2006
Posts: 9292
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sleepsleep

hi there,
while doing this smart card dll, i face one problem
let me describe my problem.

eg.

Code:

somevariable db 0x00, 0xA4, 0x04, 0x00, 0x0A, 0x0A0, 0x00, 0x00, 0x00, 0x74, 0x4A, 0x50, 0x4E, 0x00, 0x10

now, assume i need to view it through OutputDebugString (return exactly like 0x00 0xA4 0x00 0x0A .... ~

first idea i got is like
f1 db '%lX ',0
f2 db '%s',0
mov eax,somevariable
xor edx,edx
mov edx, byte [eax]
invoke wsprintf,buff,f1,edx
mov esi,buff2
invoke lstrlen,buff
add esi,eax
invoke wsprintf,esi,f2,buff

u guys got any idea?

20 May 2007, 23:58

sleepsleep

just coded this (seems workable on my side)
could read the smartcard response now (match with string) through debugger (more easier now)
if first byte is zero, it returns immediately, u can check it with eax, if u supply sz, it will loop until that byte, if u supply zero, it loop until it finds 0 byte.

Code:

buff2                            rb 0xFF
debug                                rb 0xFF
debugr                               dd ?
debugw                          dd ?
debugs                          dd ?

proc debug_mem addr, sz
; -- -------------------
             push    debug
               pop     [debugw]
            push    [addr]
              pop     [debugr]
            cmp     [sz],0
              je      .till_null
          push    [sz]
                pop     [debugs]
    
    .s1:
            xor     edx,edx
             mov     eax,[debugr]
                mov     dl,byte [eax]
       cinvoke wsprintf,buff2,f2,edx
       cinvoke wsprintf,[debugw],f3,buff2
  invoke  lstrlen,buff2
               add     [debugw],eax
                inc     [debugr]
            dec     [debugs]
            cmp     [debugs],0
          je      .exit
               jmp     .s1
 
    .till_null:
             mov     eax,[addr]
          cmp     byte [eax],0
                je      .first_null
         mov     [debugs],1
          inc     eax
         
            .s2:
                    cmp     byte [eax],0
                        je      .s1
                 inc     eax
                 inc     [debugs]
                    jmp     .s2
         
            .first_null:
                    mov     eax,0
                       ret
 
    .exit:
          mov     eax,debug
           ret
endp

21 May 2007, 01:21

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