Jeff, this exact approach is something I have on my long list of to-do's - I
don't have an answer for you, but certainly want to see what others respond.
However, in the interim, I would like to suggest as a debug tool a program
called examdiff... if you store a "before" and "after" snapshot of the exe
file, this will let you see precisely where the differences are.

- Roger

----- Original Message -----
From: "Jeff" <jma_at_mfire.com>
To: <sftalk_at_forth.com>
Sent: Thursday, December 11, 2003 10:52 PM
Subject: [sftalk] Editting an exe

> This is driving me nuts, so hopefully the gurus can help. I'm working
> on a registration system for my product. One of the checks is that in
> the program there is:
>
> CREATE foo 0 ,
>
> Now, later on in the code is a check function:
>
> : is-registered ( -- flag ) foo @ 0<> ;
>
> Of course it is more complicated than this, but you get the idea. Now,
> on my web server, I directly edit the final EXE file and replace the 0
> with a different value that is specific to the end-user. I'm finding
> the location to put it with a hex editor, searching on "foo" and
> moving 12 bytes downstream of the name (where there is 4 00 bytes).
>
> However, when executed foo @ still returns 0. I assume that I'm just
> writing the constant into the wrong memory location, but what worries
> me is that perhaps SF is doing something I'm not expecting and that I
> can't do what I want.
>
> Thanks for any suggestions.
>
> --
> Best regards,
> Jeff mailto:jma_at_mfire.com
>
>
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Received on Fri Dec 12 2003 - 06:19:09 PST