Huge Pointer question

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1 total messages Started by Mark Hjelm Tue, 28 Jul 1992 19:51

#96

Author: 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

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