Re: Asynchronous (overlapping) file access
"Alexander Nickolov" <agnickolov@mvps.org> wrote in message
news:eQSQWnS1HHA.1204@TK2MSFTNGP03.phx.gbl...
Why do you think so? Is this the result of testing you've done?
Ok, I take that back after rereading the description of
FILE_FLAG_NO_BUFFERING in the CreateFile documentation.
--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://vcfaq.mvps.org
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"Ben Voigt [C++ MVP]" <rbv@nospam.nospam> wrote in message
news:OOm2cXI1HHA.1164@TK2MSFTNGP02.phx.gbl...
Check "result" returned by WriteFile, and if zero call GetLastError()
and check for ERROR_IO_PENDING or other error codes. If WriteFile does
overlap it returns zero with ERROR_IO_PENDING.
But WriteFile is not guaranteed to return early for all conditions: It
can elect to complete the write during the call, and it may do so for
some data lengths, some disk drivers, etc.
And almost surely does so when you specify "no buffering".
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