I'm trying to do a disk file pre-allocation under XP and Vista programmatically. I'm using just an fseek() positionning on the desired max space at creation time since I've read that if it goes beyond the EOF it automaticcaly fills the empty space with zeroes.
Well, it doesn't allocate (size 0k under Explorer) if I do just the fseek(). But as soon as I do a write somewhere, righte after it fills-in with spaces.
Is there any other technique, more reliable, to do file disk pre-allocation?
Try having a look at this:
http://support.microsoft.com/default...b;EN-US;841551
The System Call "SetEndOfFile" is supposed to do that.
How you go about doing that from the C runtime is a more interesting question.
--
Mats
Compilers can produce warnings - make the compiler programmers happy: Use them!
Please don't PM me for help - and no, I don't do help over instant messengers.
Thanks Mats, I'll look at. I can do in run time writing a dummy character at the last position of fseek(). I this case I need to keep in mind that dummy. As I'm working with a bunch of files in all kinds of I/O operations I would have liked a "one shot" module at the beginning of the app - C run time of course - to perform the necessary allocations and don't bother after that.
