macro proc problem

Index > Macroinstructions > macro proc problem

Author

Thread

marcinzabrze12

Joined: 07 Aug 2011
Posts: 61

marcinzabrze12 15 Aug 2011, 22:30

If Arg in below procedure is a pointer to structure for example WIN32_FIND_DATA, how i can get pointer to a field .cFileName of this structure ?

Now i'm get it in this way:

Code:

section '.data' data readable writeable
WFD       WIN32_FIND_DATA

section '.code' code readable executable
start:
        stdcall  NameProc, WFD
        invoke  ExitProcess,0

proc NameProc uses ebx esi edi, Arg
 mov  eax, [Arg]
 add   eax, 44  ; because I already know that is offset a field .cFileName
 
ret
endp

Is ther other way to get it if I don't remember a value of numerical constant this field of structure ???

Sorry for my english.

15 Aug 2011, 22:30

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 15 Aug 2011, 23:55

Code:

proc NameProc uses ebx esi edi, Arg
 mov  eax, [Arg]
 lea  eax, [eax + WIN32_FIND_DATA.cFileName] ; Or "add eax, WIN32_FIND_DATA.cFileName"

ret
endp

15 Aug 2011, 23:55

Mike Gonta

Joined: 26 Dec 2010
Posts: 243

Mike Gonta 16 Aug 2011, 08:01

marcinzabrze12 wrote:

Is ther other way to get it if I don't remember a value of numerical constant this field of structure ???

Code:

include 'macro/masm.inc'
all EQU ebx ecx edx edi esi ; simple equate for "uses"
proc NameProc uses all, Arg
  assume eax:WIN32_FIND_DATA
  mov eax, [Arg] 
  lea eax, [eax.cFileName]
ret 
endp

_________________
Mike Gonta
look and see - many look but few see

https://mikegonta.com

16 Aug 2011, 08:01

Mike Gonta

Joined: 26 Dec 2010
Posts: 243

Mike Gonta 16 Aug 2011, 08:04

marcinzabrze12 wrote:

Is ther other way to get it if I don't remember a value of numerical constant this field of structure ???

Code:

include 'macro/masm.inc'
all EQU ebx ecx edx edi esi ; simple equate for "uses"
proc NameProc uses all, Arg
  assume eax:WIN32_FIND_DATA
  mov eax, [Arg] 
  lea eax, [eax.cFileName]
ret 
endp

_________________
Mike Gonta
look and see - many look but few see

https://mikegonta.com

16 Aug 2011, 08:04

marcinzabrze12

Joined: 07 Aug 2011
Posts: 61

marcinzabrze12 16 Aug 2011, 09:00

@LocoDelAssembly: It's exactly what i need know: WIN32_FIND_DATA.cFileName = 44

@Mike Gonta: I can't understand "assume" - Makes what this instruction ?

16 Aug 2011, 09:00

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum