Problem with modified Examplecode of HELLO.ASM

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Richter

Joined: 02 Sep 2005
Posts: 5

Richter 02 Sep 2005, 07:12

Hi,
i have modified the Hello exampel a little bit, now it doesnt work anymore Laughing

I want to change a letter at runtim, but i just get runtime memmory errors of windows

Code:

include 'win32ax.inc'

.code

  start:

        jmp goon
        text db "h",0
        name db "test"
        goon:

        mov ah, "a"
        mov [text], ah

        invoke  MessageBox,HWND_DESKTOP,text,name,MB_OK
        invoke  ExitProcess,0

.end start

Why does it not work?

Thx!

And sorry, english is not my nativ luange!

02 Sep 2005, 07:12

decard

Joined: 11 Sep 2003
Posts: 1092
Location: Poland

decard 02 Sep 2005, 07:40

That's because you're trying to write to your code section, which doesn't have "writeable" flag. If you want to keep both code and data in one section, then replace ".code" (3rd line) with:

Code:

section '.code' code data readable writeable

And, btw, there's missing 0 after name db "test".

regards

02 Sep 2005, 07:40

Richter

Joined: 02 Sep 2005
Posts: 5

Richter 02 Sep 2005, 07:45

Thx to the big noob helper! Very Happy

02 Sep 2005, 07:45

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