RE: retrieving the cluster size on xp

I didn't explain myself properly... I wrote some deviceiocontrol code for
wme/w98 and it craches because createfile on vmm32.vxd (or whatever) returns
null. Getdiskfreespace works properly on my machine (then again, I have 32k
and 4k clusters...). Still, there should be a function that works on ALL
windowses and that returns the cluster size.

----------------------------------
Peace and love,
Tweety
[email protected] - [email protected]
YahooID: tweety_04_01



-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
Carsten Orthbandt
Sent: March 14, 2004 3:58 AM
To: [email protected]
Subject: RE: [GD-Windows] retrieving the cluster size on xp

I'd bet some money on your source being the reason for crashing. The
GetDiskFreeSpace API works fine for me on all flavours of Win32. I don't
think you'll crash XP calling this function, it's your app.
Generally, Win9x is much more forgiving when it comes to invalid memory
accesses than the WinNT siblings.
Wich is actually a good thing.

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: [email protected]
> [mailto:[email protected]] On Behalf Of 
> tweety
> Sent: Sunday, March 14, 2004 5:02 AM
> To: [email protected]
> Subject: RE: [GD-Windows] retrieving the cluster size on xp
> 
> 
> Ok, I'll try it. Thanks. By the way, I did it in w98/me a long time 
> ago, it just crashes on xp... :) You know, I find really sad that 
> 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 
> cluster size reliably in all operating systems... Maybe longhorn?...
> 
> ----------------------------------
> Peace and love,
> Tweety
> [email protected] - [email protected]
> YahooID: tweety_04_01
> 
>  
> 
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of 
> Simon O'Connor
> Sent: March 13, 2004 5:06 PM
> To: [email protected]
> Subject: RE: [GD-Windows] retrieving the cluster size on xp
> 
> 
> Hi Tweety,
> 
> 
> GetDiskFreeSpace() is supported on Windows XP, Windows 2000, Windows 
> NT, Windows Me, Windows 98, Windows 95, and Windows Server 2003...
> 
> My comments about 9x were just addressing your preference for a 
> portable method.
> 
> 
> Cheers,
> 
> Simon O'Connor
> Programmer @ Acclaim
> & Microsoft DirectX MVP
> 
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]]
> On Behalf Of
> > tweety
> > Sent: 13 March 2004 21:55
> > To: [email protected]
> > Subject: RE: [GD-Windows] retrieving the cluster size on xp
> > 
> > I specified in the subject that I'm interested in finding out the 
> > 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...
> > 
> > ----------------------------------
> > Peace and love,
> > Tweety
> > [email protected] - [email protected]
> > YahooID: tweety_04_01
> > 
> >  
> > 
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]]
> On Behalf Of
> > Simon O'Connor
> > Sent: March 13, 2004 4:42 PM
> > To: [email protected]
> > Subject: RE: [GD-Windows] retrieving the cluster size on xp
> > 
> > 
> > Hi Tweety,
> > 
> > 
> > You can use GetDiskFreeSpace() to find the number of sectors per 
> > cluster and the number of bytes per sector so simply
> multiply them to
> > find the size of a cluster.
> > 
> > 
> > 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).
> > 
> > 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 
> > something like PartitionMagic etc). If you do need the totally 
> > accurate value, you could obtain the DDK and take a look at the 
> > Win9x/Me specific FS_GetDiskInfo() function.
> > 
> >  
> > Cheers,
> >  
> > Simon O'Connor
> > Programmer @ Acclaim
> > & Microsoft DirectX MVP
> > 
> > 
> > ________________________________
> > 
> > 	From: [email protected]
> > [mailto:[email protected]]
> On Behalf Of
> > tweety
> > 	Sent: 11 March 2004 23:39
> > 	To: [email protected]
> > 	Subject: [GD-Windows] retrieving the cluster size on xp
> > 	
> > 	
> > 	Can someone please tell me how to get the cluster
> allocation size in
> 
> > 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 
> > deviceiocontrol's functions, but none seems to return the
> cluster size
> > or something that i could use... can you tell me?
> > 	 
> > 		----------------------------------
> > 	Peace and love,
> > 	Tweety
> > 	[email protected] - [email protected]
> > 	YahooID: tweety_04_01
> > 	
> > 	
> > 
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