Using MASM to create a .dll

[JoueurDébutant]

Hi everyone !

First of all, please excuse my English, I'm foreigner...

I'm just beginning with MASM. I aim to write a .dll file which contains only one procedure. This procedure should interchange the contents of two Bytes, which will be arguments of the procedure. I wrote this code :

Code Select Expand

.386
.model flat, stdcall
option casemap: none

.code

start:

echange PROC p1: PTR, p2: PTR

mov eax, p1
mov ebx, p2
mov p1, ebx
mov p2, eax

ret

echange endp

end start

Could you please tell me whether this code is good ?

Thank you very much ! :U

[qWord]

Your procedure only change the arguments p1 and p2, which will be discarded when the procedure returns.

Code Select Expand

echange PROC uses ebx p1: PTR BYTE, p2: PTR BYTE

mov eax, p1
mov ebx, p2
mov dl,BYTE ptr [eax]
mov dh,BYTE ptr [ebx]
mov BYTE ptr [ebx],dl
mov BYTE ptr [eax],dh

ret

echange endp

[dedndave]

welcome to the forum   :U
i think we just had this discussion   :P

the forum search tool can answer some questions for you
http://www.masm32.com/board/index.php?topic=18309.0

[JoueurDébutant]

@qWord: Thank you for your answer !

@dadndave : ok, next time I first search in the forum.

Bye !