Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!usc!samsung!olivea!uunet!odi!ed
From: ed@odi.com (Ed Schwalenberg)
Newsgroups: comp.windows.ms.programmer
Subject: Re: GlobalDosAlloc
Message-ID: <1991Jan24.152328.6875@odi.com>
Date: 24 Jan 91 15:23:28 GMT
References: <ELHADAD.91Jan23121418@mermaid.cs.columbia.edu>
Distribution: comp
Organization: Object Design, Inc.
Lines: 13
In-Reply-To: elhadad@cs.columbia.edu's message of 23 Jan 91 17:14:18 GMT

In article <ELHADAD.91Jan23121418@mermaid.cs.columbia.edu> elhadad@cs.columbia.edu (Michael Elhadad) writes:

  I'm trying to understand when and why to use GlobalDosAlloc as opposed to
  GlobalAlloc.  Assume I am running in enhanced mode.  The only difference I 
  have read in the doc is GloabalDosAlloc will allocate the memory under the 
  1M line.  Why should that make a difference to an application?

The only real reason for using GlobalDosAlloc is that your Windows application
wants to share memory with a DOS application (like a TSR) which can only access
memory under 1MB.  Note that GlobalDosAlloc returns TWO addresses: a selector
which can be used in protected mode and a paragraph-segment value for the
real mode (i.e., DOS) program to use.  Normal Windows applications don't ever
use GlobalDosAlloc.