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From: mojo@netcom.UUCP (Morris Jones)
Newsgroups: comp.windows.ms
Subject: Re: No free MS support for SDK; How to use lots of mem in a Win program?
Message-ID: <12438@netcom.UUCP>
Date: 23 Aug 90 06:57:23 GMT
References: <1990Aug19.132046.24146@eng.umd.edu> <prk.651226036@aries>
Organization: Netcom- The Bay Area's Public Access Unix System {408 241-9760 guest}
Lines: 28

Yes you can use large chunks of memory in Windows 3.0.  I've been doing
it successfully for a while now.

To allocate chunks larger than 64K, use GlobalAlloc(), and lock to a
pointer declared as "huge".  The C compiler (at least Microsoft's) will
properly increment the pointer using a external variable named __ahincr
to increment the selector number to point to the next 64K chunk.  Just
don't try doing pointer comparisons or convert a Selector:Offset address
into a physical address.  (They call this selector tiling.)

You can also use 32-bit programs in Windows 3.0 using the WINMEM32 DLL.
Course, this requires a true 32-bit compiler such as Watcom or Metaware.

If you want to write some assembler to do memory references, you can allocate
some 32-bit memory using WINMEM32 and use 32-bit offsets to reference it.
Or use Global16PointerAlias() to get a 16-bit selector into 32-bit memory.

The possibilities are endless.  But if all you've done in the past is DOS
programs, I highly recommend Intel's 80386 Programmer's Guide.  Get familiar
with how this stuff works.

Mojo
Caere Corp.

-- 
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