RE: [GD-Windows] retrieving the cluster size on xp

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EVERY filesystem is divided in clusters, even CDFS/UDF and linux'
filesystems (reiserfs and... Whatever the normal one is called, I forgot =
:)
), even if they're as small as 1 byte (I personally never heard of one).
That's because, when adding new parts to a file surrounded by 2 other =
files,
you need a way to tell the os where to look for the next part, and you
really can't add a LONGLONG (int64) after every byte... Even a rle-based
approach would be slow when updating. So they just stuff a "next =
pointer"
for each cluster (since most fss store the next pointer at the =
beginning,
the macimum number of files/folders/objects etc is limited).
I know deviceiocontrol works differently on w200x/xp, but I haven't been
able to find out anything but bytes/sector, and I still need =
sectors/cluster
or something.
So, now tell me why is it so wrong to expect a function that receives a =
path
within the system (on windows it could be an itemidlist) (the path is
required because of the mounting points in wnt+ and linux etc) and =
retrieve
the cluster size of that folder (or return false when it cannot)? I'm =
not
talking about an os-independent function, I'm talking about a wrapper of =
the
different methods to get the cluster size (that's now; if they would =
have
thaught of that sooner, they could have written a propper getclusersize =
from
the beginning).

About the null pointer: the first write of a function as esoteric as my
w9x-compatible getclustersize that uses vxds and deviceiocontrol really
isn't that centered at handling internally errors, I just step through =
it
with the debugger. And I just used the disk in "readonly" mode, I love =
my
hard disk too :))

----------------------------------
Peace and love,
Tweety
mi...@sy... - twe...@us...
YahooID: tweety_04_01

-----Original Message-----
From: gam...@li...
[mailto:gam...@li...] On Behalf Of
Carsten Orthbandt
Sent: March 14, 2004 6:43 PM
To: gam...@li...
Subject: RE: [GD-Windows] retrieving the cluster size on xp

Erm... Show me _one_ *.vxd on a NT based OS. There ain't none.
DeviceIoControl is _documented_ to be different on NT and 9x.
If you rely on specific behaviour for portable code, you're doomed. =
OTOH,
given the wide variety of filesystems on Win32 systems, why do you =
expect to
find something like a cluster size at all? Why should it matter?
You either write portable application code and shouldn't have to resort =
to
native OS constants. Or you write OS specific code and then you'll have =
to
face the differences. And you better know about them.
9x and NT/2K/XP _are_ different platforms. System information easily =
tells
you that. Having nearly the same API on both of them is a mere =
convenience,
not a guarantee.

And: Your code crashes because CreateFile() returned NULL???
You'd better learn proper error handling before messing with my hard =
disk...

Carsten Orthbandt
Founder + Development Director
SEK SpieleEntwicklungsKombinat GmbH
http://www.sek-ost.de

Wenn ich Visionen habe, gehe ich zum Arzt. - Helmut Schmidt

> -----Original Message-----
> From: gam...@li...
> [mailto:gam...@li...] On Behalf Of =

> tweety
> Sent: Sunday, March 14, 2004 10:37 PM
> To: gam...@li...
> Subject: RE: [GD-Windows] retrieving the cluster size on xp
>=20
>=20
> I didn't explain myself properly... I wrote some deviceiocontrol code=20
> for wme/w98 and it craches because createfile on vmm32.vxd (or=20
> whatever) returns null.
> Getdiskfreespace works properly on my machine (then again, I have 32k=20
> and 4k clusters...). Still, there should be a function that works on=20
> ALL windowses and that returns the cluster size.
>=20
> ----------------------------------
> Peace and love,
> Tweety
> mi...@sy... - twe...@us...
> YahooID: tweety_04_01
>=20
>=20
>=20
> -----Original Message-----
> From: gam...@li...
> [mailto:gam...@li...] On Behalf Of =

> Carsten Orthbandt
> Sent: March 14, 2004 3:58 AM
> To: gam...@li...
> Subject: RE: [GD-Windows] retrieving the cluster size on xp
>=20
> I'd bet some money on your source being the reason for crashing. The=20
> GetDiskFreeSpace API works fine for me on all flavours of Win32. I=20
> don't think you'll crash XP calling this function, it's your app.=20
> Generally, Win9x is much more forgiving when it comes to invalid=20
> memory accesses than the WinNT siblings. Wich is actually a good=20
> thing.
>=20
> Carsten Orthbandt
> Founder + Development Director
> SEK SpieleEntwicklungsKombinat GmbH
> http://www.sek-ost.de
>=20
> Wenn ich Visionen habe, gehe ich zum Arzt. - Helmut Schmidt
>=20
>=20
> > -----Original Message-----
> > From: gam...@li...
> > [mailto:gam...@li...]
> On Behalf Of
> > tweety
> > Sent: Sunday, March 14, 2004 5:02 AM
> > To: gam...@li...
> > Subject: RE: [GD-Windows] retrieving the cluster size on xp
> >=20
> >=20
> > Ok, I'll try it. Thanks. By the way, I did it in w98/me a long time=20
> > ago, it just crashes on xp... :) You know, I find really sad that=20
> > there's a function in *foxpro* to find the cluster size of
> a drive and
> > there's not ONE thing in the whole windows 32 api to return the=20
> > cluster size reliably in all operating systems... Maybe longhorn?...
> >=20
> > ----------------------------------
> > Peace and love,
> > Tweety
> > mi...@sy... - twe...@us...
> > YahooID: tweety_04_01
> >=20
> > =20
> >=20
> > -----Original Message-----
> > From: gam...@li...
> > [mailto:gam...@li...]
> On Behalf Of
> > Simon O'Connor
> > Sent: March 13, 2004 5:06 PM
> > To: gam...@li...
> > Subject: RE: [GD-Windows] retrieving the cluster size on xp
> >=20
> >=20
> > Hi Tweety,
> >=20
> >=20
> > GetDiskFreeSpace() is supported on Windows XP, Windows 2000, Windows =

> > NT, Windows Me, Windows 98, Windows 95, and Windows Server 2003...
> >=20
> > My comments about 9x were just addressing your preference for a=20
> > portable method.
> >=20
> >=20
> > Cheers,
> >=20
> > Simon O'Connor
> > Programmer @ Acclaim
> > & Microsoft DirectX MVP
> >=20
> > > -----Original Message-----
> > > From: gam...@li...
> > > [mailto:gam...@li...]
> > On Behalf Of
> > > tweety
> > > Sent: 13 March 2004 21:55
> > > To: gam...@li...
> > > Subject: RE: [GD-Windows] retrieving the cluster size on xp
> > >=20
> > > I specified in the subject that I'm interested in finding out the=20
> > > cluster size (it's not a hint, but not partitionmagic, I'm
> > just trying
> > > to find out the waste of space on my drive) on *xp*, not
> 9x/me. And
> > > I'd really, REALLY, REEEALY preffer not to go to the ddk...
> > >=20
> > > ----------------------------------
> > > Peace and love,
> > > Tweety
> > > mi...@sy... - twe...@us...
> > > YahooID: tweety_04_01
> > >=20
> > > =20
> > >=20
> > > -----Original Message-----
> > > From: gam...@li...
> > > [mailto:gam...@li...]
> > On Behalf Of
> > > Simon O'Connor
> > > Sent: March 13, 2004 4:42 PM
> > > To: gam...@li...
> > > Subject: RE: [GD-Windows] retrieving the cluster size on xp
> > >=20
> > >=20
> > > Hi Tweety,
> > >=20
> > >=20
> > > You can use GetDiskFreeSpace() to find the number of sectors per=20
> > > cluster and the number of bytes per sector so simply
> > multiply them to
> > > find the size of a cluster.
> > >=20
> > >=20
> > > The docs for GetDiskFreeSpace() do mention that the
> returned sectors
> > > per cluster value can be inaccurate under Windows 9x/ME
> for drives
> > > with more than 64 sectors per cluster (the 80Gb drive in
> > this machine
> > > only has 8 per cluster so it might be a fairly unusual case).
> > >=20
> > > This is probably only an issue for you if your
> application needs to
> > > use this for something more than a "hint" (e.g. if you're writing=20
> > > something like PartitionMagic etc). If you do need the totally=20
> > > accurate value, you could obtain the DDK and take a look at the=20
> > > Win9x/Me specific FS_GetDiskInfo() function.
> > >=20
> > > =20
> > > Cheers,
> > > =20
> > > Simon O'Connor
> > > Programmer @ Acclaim
> > > & Microsoft DirectX MVP
> > >=20
> > >=20
> > > ________________________________
> > >=20
> > > 	From: gam...@li...
> > > [mailto:gam...@li...]
> > On Behalf Of
> > > tweety
> > > 	Sent: 11 March 2004 23:39
> > > 	To: gam...@li...
> > > 	Subject: [GD-Windows] retrieving the cluster size on xp
> > > =09
> > > =09
> > > 	Can someone please tell me how to get the cluster
> > allocation size in
> >=20
> > > windowsxp? of course, a portable way is the best, but just
> > 2000/xp is
> > > fine.
> > > i searched the internet far and wide and all i could find
> is how to
> > > find it on fat16/12 partitions and on w95/98/xp. i looked at=20
> > > deviceiocontrol's functions, but none seems to return the
> > cluster size
> > > or something that i could use... can you tell me?
> > > 	=20
> > > 		----------------------------------
> > > 	Peace and love,
> > > 	Tweety
> > > 	mi...@sy... - twe...@us...
> > > 	YahooID: tweety_04_01
> > > =09
> > > =09
> > >=20
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