Advanced IO in .Net; unanswerable ?

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

modosansreves - 01 Mar 2007 22:32 GMT

For a rather long time I've been looking for the following
functionality:

* On NTFS a file can have several names (hard links). How to enlist
them ?

* I'm going to create a file and I exactly know the future size. How
can I
- indicate that size in order to reduce possible fragmentation,
- indicate that I'm going to do sequential writes only ?

* On NTFS an empty folder can have a logical partition mounted to it.
There are also junctions.
Given a "folder" name, how to determine whether it is a regular
folder, a mount point or a junction ?

* Consequently from the previous,
a logical partition can have multiple mount points. How to enlist
them ?

Please ;) ...

Reply to this Message

RobinS - 02 Mar 2007 01:28 GMT

You might try posting your questions to
microsoft.public.dotnet.languages.csharp or
microsoft.public.dotnet.languages.vb, whichever is your choice. They are a
lot more active than this one is.

Robin S.
-----------------------------------------------

> For a rather long time I've been looking for the following
> functionality:
[quoted text clipped - 17 lines]
>
> Please ;) ...

Reply to this Message

Mattias Sjögren - 02 Mar 2007 06:01 GMT

>You might try posting your questions to
>microsoft.public.dotnet.languages.csharp or
>microsoft.public.dotnet.languages.vb, whichever is your choice. They are a
>lot more active than this one is.

I'd recommend posting to a group like
microsoft.public.win32.programmer.kernel instead. The questions are in
no way related to C# or VB. The answer will likely be the same
regardless of which language you want to do this from.

>> * On NTFS a file can have several names (hard links). How to enlist
>> them ?

I don't know any other way than to enumerate all files/links and
checking if they refer to the same physical file (by calling
GetFileInformationByHandle and comparing
BY_HANDLE_FILE_INFORMATION.nFileIndexHigh/Low).

>> * I'm going to create a file and I exactly know the future size. How
>> can I
[quoted text clipped - 5 lines]
>> Given a "folder" name, how to determine whether it is a regular
>> folder, a mount point or a junction ?

You can use GetVolumeNameForVolumeMountPoint or
FindFirstVolumeMountPoint and related fuctions to determine which
mount points there are.

Junctions are implemented with reparse points, so you can check the
attributes of the directory and look for FileAttributes.ReparsePoint.

Mattias

Signature

Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

Reply to this Message

modosansreves - 10 Mar 2007 13:51 GMT

Thank you very much, Mattias :)

Unfortunately, I didn't met GetVolumeNameForVolumeMountPoint before
and now I know at least one solution to my problems and a land to dig
for other solutions.

Reply to this Message

BrianH - 14 Mar 2007 20:28 GMT

Thank you very much Robin! I had missed these and they seem to be more
in line with my current needs. I wouldn't have known about them if you
hadn't gone out of your way to direct someone there.

BrianH

> You might try posting your questions to
> microsoft.public.dotnet.languages.csharp or
> microsoft.public.dotnet.languages.vb, whichever is your choice. They are a
> lot more active than this one is.
>
> ...

Reply to this Message

RobinS - 15 Mar 2007 19:18 GMT

You're welcome. I just cruise through once in a while and let people know.

Good luck.
Robin S.
--------------------

> Thank you very much Robin! I had missed these and they seem to be more
> in line with my current needs. I wouldn't have known about them if you
[quoted text clipped - 8 lines]
>>
>> ...

Reply to this Message

Advanced IO in .Net; unanswerable ?

Free Magazines