Subject: Acessing DPMI memory without farptr
From: Bryanston School <MOLESWORTH DOT THOMAS AT bryanston DOT co DOT uk>
Date: Tue, 21 May 1996 14:23:47 +0100
Message-Id: <000000199912915529827@bryanston.co.uk>
Organization: Bryanston School
To: DJGPP mailing list <djgpp AT delorie DOT com>
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Is there a way to access memory allocated through the __dpmi functions
through pointers? I would prefer to access it directly, rather than
using things like _farpeekb and so on. It's annoying to have to use
_farpeek functions when dumping 1 Mb to a file, for example. I am
trying to capture an area of memory which is mapped into linear memory
off a physical device to disk. I mapped this memory using the instructions
in the FAQ (map physical memory, allocate descriptor, set limits and base),
but I don't seem to be able to access it without using the _farpeek / =
_farpoke
functions. Is there a quick way to do fwrite(memory, sizeof(memory), =
sizeof(int), filehandle) without doing it in a loop and transferring 4 =
bytes to the disk at once?

Also, I have found that declaring a lot of local variables in
main() sometimes gives errors, such as variables changing between
one printf() and another. Is this a known feature/bug, and if so what
should I do about it? I am currently declaring them global, which seems
to work. I'll post the code if this sounds strange.

Thanks in advance,

Thomas Molesworth
mailto:MOLESWORTH DOT THOMAS AT bryanston DOT co DOT uk