Re: Assembly in Win32

["Joseph Hardin" <lazer@zianet.com>]

Windows is real picky about which memory addresses you access, be careful
when addressing, since it won't allow you access to alot of registers(for
instance, try writing a putpixel proc with a 32bit c++ compiler , and window
throws a protection fault)
-----Original Message-----
From: Neil <dreaded.neil@phreaker.net>
To: gameprogrammer@gameprogrammer.com <gameprogrammer@gameprogrammer.com>
Date: Friday, October 13, 2000 2:35 AM
Subject: Assembly in Win32


>Well, I figured out how to get the data for the BIOS font, by:
>mov BH, 3 ;flag to return 8x8 font pointer
>mov AX, 0x1130 ;function 11h, subfunction 30h
>int 0x10 ;interrupt 10h
> . . then the font bitmap starts at [ES:BP] (and BP must be resored). When
>I try the code in "debug," it appears to work fine. This is great, except .
> .
>
>I'm using NASM to output a Win32 .obj file, and linking it with the rest of
>my program. Whenever I call this as function, though, I get a GPF. Somehow
>I get the feeling that Windows doesn't like me trying to do this sort of
>thing (I also feel a little stupid because I can't figure out how to get my
>attempts at assembly to work). Is it possible to do this in my Win32
>program (i.e. does Win32 even allow the use of int, and if so, are there
>certain restrictions, and what about memory addressing differences)? If
>not, is there an alternative that would accomplish the same thing?. :]
>
>-[ Neil-Edelman -- dreaded.neil@phreaker.net -- ICQ UIN: 705130
>-[ http://neil.freeshell.org/ -- http://moop.bizland.com/
>-[ "Nature makes frequent use of [the infinite] everywhere." -Georg Cantor
>
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