How can I use WriteFile API funct with an offset not multiple of 512 inside my flash memory?

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Hello..........
I'm now after achieving ReadFile() using this API function trying to write using WriteFile API function some bytes to my flash memory(pendrive). the problem is that I only can move the pointer using SetFilePointerEx() API function a multiple of 512 bytes offset, what if I want to write for example at 43 bytes offset? 43 is not multiple of 512 then a can't get there using SetFilePointerEx().. or really a can but a don't know how????..someone could help me?..

Posted 7-Jul-11 8:37am

glbrt.gds

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TRK3 · Accepted Answer · 2011-07-07T09:46:00

Solution 1

The typical way of doing partial page writes to a device that only supports writes on page boundaries is to first read the entire page into memory, then change the bytes you want to change in your in memory copy, then write the entire page back out.

Posted 7-Jul-11 9:46am

TRK3

Comments

Sergey Alexandrovich Kryukov 7-Jul-11 19:19pm

That is correct idea, my 5.
--SA

glbrt.gds 8-Jul-11 8:50am

and mine too ............ :) ..thanks.. but.. what is the fastest way to modify my byte buffer array???