bytes in an array

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RedGhost

Joined: 18 May 2005
Posts: 443
Location: BC, Canada

RedGhost 24 May 2005, 15:17

if szMessage was 'abc'
and i wanted to push a certain character from that string
how would i go about that?

in c it would be szMessage[0], if i wanted the 'a'

24 May 2005, 15:17

coconut

Joined: 02 Apr 2004
Posts: 326
Location: US

coconut 24 May 2005, 16:02

not sure but try something like

cmp byte [szMessage+1] ,'a'

24 May 2005, 16:02

madmatt

Joined: 07 Oct 2003
Posts: 1045
Location: Michigan, USA

madmatt 24 May 2005, 16:30

Or you can do something like this:

Code:

    mov   ecx, 0; or any character wanted.
    mov   al, [szMessage + ecx] ;get first character, position 0.
    ;this method allows you to loop though the characters.

You did say push, so:

Code:

    mov   ecx, 2; or any character wanted
    mov   al, [szMessage + ecx] ;get third character, position 2.
    push  eax  ;ALWAYS, push a DWORD sized value on the stack.
    pop   eax ;restores char in AL. and also preserves AH
    ;this method also allows you to loop though the characters

24 May 2005, 16:30

RedGhost

Joined: 18 May 2005
Posts: 443
Location: BC, Canada

RedGhost 24 May 2005, 18:22

coconut wrote:

not sure but try something like

cmp byte [szMessage+1] ,'a'

yeah you can compare or replace them that way

madmatt wrote:

Or you can do something like this:

Code:

    mov   ecx, 0; or any character wanted.
    mov   al, [szMessage + ecx] ;get first character, position 0.
    ;this method allows you to loop though the characters.

You did say push, so:

Code:

    mov   ecx, 2; or any character wanted
    mov   al, [szMessage + ecx] ;get third character, position 2.
    push  eax  ;ALWAYS, push a DWORD sized value on the stack.
    pop   eax ;restores char in AL. and also preserves AH
    ;this method also allows you to loop though the characters

thanks alot, and yeah thats exactly what i was trying to do (loop thru em)

24 May 2005, 18:22

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