Huge Pointer question

Article View: comp.windows.ms.programmer

Article #96

Back to comp.windows.ms.programmer Previous Next

#96

From: Mark Hjelm
Date: Tue, 28 Jul 1992 19:51

20 lines
1284 bytes

    If I were to allocate two large (>64k) chunks of memory, say
using GlobalAlloc, what would be the proper way to copy the data
from one to the other?  When I use GlobalLock on such things, is
the offset portion of the returned pointer guaranteed to be 0?  If
so, can I just step though the chunks in 64k pieces, converting a
huge pointer to the base of each piece to a far pointer and then
using the standard _fmemcpy and friends?  If so, does this technique
work under both Microsoft C and Borland C (i.e. do they implement
huge pointers the same way)?  If not, what do I do?  What about if
I want to copy some portion of the chunks of memory at different
offsets within the chunks?  Do I need to be really careful about
64K boundaries? Just for completeness, what about plain DOS and 
halloc?
    
Thanks,
Mark
hjelm@cs.cmu.edu

Technical Details

Message-ID: <1992Jul28.195140.137052@cs.cmu.edu>

Path: arc1-ca.pugleaf.net!sparky!uunet!ogicse!das-news.harvard.edu!cantaloupe.srv.cs.cmu.edu!hjelm

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!sparky!uunet!ogicse!das-news.harvard.edu!cantaloupe.srv.cs.cmu.edu!hjelm
From: hjelm+@cs.cmu.edu (Mark Hjelm)
Newsgroups: comp.windows.ms.programmer
Subject: Huge Pointer question
Message-ID: <1992Jul28.195140.137052@cs.cmu.edu>
Date: 28 Jul 92 19:51:40 GMT
Article-I.D.: cs.1992Jul28.195140.137052
Organization: School of Computer Science, Carnegie Mellon
Lines: 20
Nntp-Posting-Host: g.gp.cs.cmu.edu