passing structure address to procedure

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xray

Joined: 22 Jul 2007
Posts: 2
Location: florida

xray 22 Jul 2007, 17:22

can any one help me? i need to pass a pointer of a structure to a procedure.
and then access certain data from the structure.

for example:

struct TDk
a db 1
b db 2
ends

tdk TDK

stdcall somefunc tdk

proc somefunc lpStrucutre
mov eax,[lpStructure].b ;should be the same as mov eax,[tdk.b]
ret
endp

22 Jul 2007, 17:22

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 22 Jul 2007, 17:48

Code:


;declaration
struct TDk 
a db 1 
b db 2 
ends


;passing:
push tdk
call somefunc

;accessing:
proc somefunc lpStruc
 mov ecx, [lpStruc] ;ecx = address of structure in memory
 mov eax, [ecx + TDK.a] ;eax = member a of structure at address ecx
 ret
endp

22 Jul 2007, 17:48

xray

Joined: 22 Jul 2007
Posts: 2
Location: florida

xray 23 Jul 2007, 13:43

thank you very much. just what i needed.

23 Jul 2007, 13:43

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