Re: Shared memory question

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#16380

From: Vladimir Afanasyev
Date: Tue, 20 May 2003 08:56

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"Remy Lebeau \(TeamB\)" <gambit47@yahoo.com> wrote:
>
>"Vladimir Afanasyev" <avv@systema.kiev.ua> wrote in message
>news:3ec4fae5$1@newsgroups.borland.com...
>
>> The question WHO will call DuplicateHandle
>> is not important
>
>Yes, of course it is important.  Only the second process needs to call it.
>The first process doesn't need to, it can just create a second read-only
>mapping handle directly (since it knows its own mapping names).  It doesn't
>need to duplicate its own original handle.
>

DuplicateHandle can duplicate handle for target process 
even it called from source process:
"If the process that calls DuplicateHandle is not the target 
process, the duplicating process must use interprocess 
communication to pass the value of the duplicate handle to the 
target process. " (from Help).
Calling DuplicateHandle from target process more suitable but
I suppose that better call DuplicateHandle from source process.
It is preventing uncontrolled expansion handles from target 
processes.
Vladimir.

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