RE: How to query for a long filename using IRP_MJ_DIRECTO RY_CONTROL/IRP_MN_QUERY_DIRECTORY?

NTFSD
1

(1) Yes. Explorer uses this technique all of the time to match up long
name/short name as well as actual case of the file name.
(2) Not in the versions you are targeting.
(3) This can either be a file name you wish to find (not a path, just a
filename) or a regular expression (e.g., “*.doc” to find all of the DOC
files within the directory.) That name will be used to match the short OR
long file name.
(4) No. IRP_MJ_DIRECTORY_CONTROL is one of the functions managed by the
Flags field in the DEVICE_OBJECT. For most file systems this will be
neither I/O, so the data will be returned in the buffer pointed to by
Irp->Userbuffer.

Regards,

Tony

Tony Mason
Consulting Partner
OSR Open Systems Resources, Inc.
http://www.osr.com

-----Original Message-----
From: vishnu [mailto:xxxxx@lycos.com]
Sent: Tuesday, November 19, 2002 8:15 AM
To: File Systems Developers
Subject: [ntfsd] How to query for a long filename using
IRP_MJ_DIRECTORY_CONTROL/IRP_MN_QUERY_DIRECTORY?

I am writing a filter driver over NTFS for WIN NT 4.0 & win2K .I get a
short filename to the delete routine of the filter driver when the file is
deleted from the command prompt using del command.(Eg.
h:\testdir\longfilename.txt will be sent as h:\testdir\longfi~1.txt).
Suppose I want to query for the long filename by creating my own IRP and
filling in the QuerDirectory structure. I have the following queries.

  1. Is it possible to always get a long filename using
    IRP_MJ_DIRECTORY_CONTROL and filling in the appropriate IRP parameters?
  2. Is it possible to obtain long filename for a particular file directly
    i.e not querying the entire directory?
  3. what do I fill up in the “FileName”(a filename in particular for which
    I want the long name or the parent directory-Eg. In the above
    case,h:\testdir ? ) and “FileIndex”(I don’t know for what reason this
    field is used for) fields in the QueryDirectory structure?
  4. will AssociatedIrp.SystemBuffer always get the results of the query?

TIA,
Vishnu

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