how to virtualy access structure inside structure?

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at0mic

Joined: 09 Mar 2005
Posts: 12

at0mic 09 Mar 2005, 23:31

something like pseudocode:

Code:

include 'win32ax.inc'

struc RGB
{
 .R  POS
 .G  POS
 .B  POS
 }

struc POS
{

.x rb ?
.y rb ?
}

.data


buffer rb 1024
.code
start:

        lea ebx,[buffer]
        virtual at ebx
        lol RGB
        end virtual

        mov al, BYTE [lol.R.y]

invoke ExitProcess,0

.end start

please help Privalov or the others Gurus!

I have troubles with:

Code:

struc IMAGE_NT_HEADERS
{
  .Signature         DWORD                   ?
  .FileHeader        IMAGE_FILE_HEADER
  .OptionalHeader    IMAGE_OPTIONAL_HEADER32
}

_________________
at0mic!

09 Mar 2005, 23:31

Vasilev Vjacheslav

Joined: 11 Aug 2004
Posts: 392

Vasilev Vjacheslav 10 Mar 2005, 09:24

i think better way to use struct macro

Code:

struct IMAGE_NT_HEADERS
  .Signature            dd ?
  .FileHeader           IMAGE_FILE_HEADER
  .OptionalHeader       IMAGE_OPTIONAL_HEADER
ends

substructures can be accessed with this code

Code:

; .unth defined inside procedure

lea edi,[.inth]
mov eax,[edi+IMAGE_NT_HEADER.FileHeader.TimeDateStamp]

Code:

; and if you have mapped pe-file, for example (edi - pointer to mapped file)

mov eax,[edi+IMAGE_DOS_HEADER.e_lfanew]
mov esi,edi
add esi,eax
mov ecx,[esi+IMAGE_NT_HEADER.FileHeader.TimeDateStamp]

10 Mar 2005, 09:24

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