Everhart, Glenn
From:	Edwards, Jonathan [Jonathan_Edwards@NAI.com]
Sent:	Tuesday, March 16, 1999 11:34 AM
To:	Rob Newberry; ntdev@atria.com; ntfsd@atria.com
Subject:	RE: [ntdev] example of using OPEN_BY_FILE_ID?

// 1st you have to open a handle to the partition the file is on  (must be
NTFS)
// it doesn't matter if the file is in a subdirectory.
   
    HANDLE                      hRoot;
    UNICODE_STRING              sRoot;
    OBJECT_ATTRIBUTES           oaRoot;

    sRoot.Buffer            =L"\\Device\\Harddisk0\\Partition2\\";    // D:
    sRoot.Length            =wcslen(sRoot.Buffer)*2;
    sRoot.MaximumLength     =sRoot.Length+2;

    InitializeObjectAttributes(&oaRoot,
                               &sRoot,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);


    status=ZwCreateFile(&hRoot,
                          SYNCHRONIZE
                        | FILE_READ_DATA,
                        &oaRoot,
                        &IoStatusBlock,
                        NULL,
                        FILE_ATTRIBUTE_NORMAL,
                        FILE_SHARE_READ | FILE_SHARE_WRITE |
FILE_SHARE_DELETE,
                        FILE_OPEN,
                        FILE_DIRECTORY_FILE,  
                        NULL,
                        0);


// Then, in the InitialiseObjectAttributes you set the root to the handle to
the partition.
    
    HANDLE                      hFile;
    UNICODE_STRING              sFile;
    OBJECT_ATTRIBUTES           oaFile;

    LARGE_INTEGER              FileID;


    FileID.HighPart=0x00600000;
    FileID.LowPart=0x000006c9;

    sFile.Buffer            =(WCHAR*)&FileID;
    sFile.Length            =8;
    sFile.MaximumLength     =8;

    InitializeObjectAttributes(&oaFile,
                               &sFile,
                               OBJ_CASE_INSENSITIVE,
                               hRoot,
                               NULL);


    status=ZwCreateFile(&hFile,
                          SYNCHRONIZE
                        | FILE_READ_DATA,
                        &oaFile,
                        &IoStatusBlock,
                        NULL,
                        FILE_ATTRIBUTE_NORMAL,
                        FILE_SHARE_READ,
                        FILE_OPEN,
                        FILE_NON_DIRECTORY_FILE | FILE_OPEN_BY_FILE_ID,  
                        NULL,
                        0);

---
Jonathan Edwards
Network Associates.


-----Original Message-----
From: Rob Newberry [mailto:robnewberry@grouplogic.com]
Sent: Monday, March 15, 1999 6:18 PM
To: ntdev@atria.com; ntfsd@atria.com
Subject: [ntdev] example of using OPEN_BY_FILE_ID?



Does anyone have an example of using NtCreateFile or ZwCreateFile with the
"FILE_OPEN_BY_FILE_ID" flag?  Rajeev Nagar's book describes how it's done
-- by passing the FileIndex returned from NtQueryInformationFile in the
name parameter, but I can't seem to get it to work.  I'm pretty sure I'm
not coaxing the LARGE_INTEGER into a UNICODE_STRING correctly.

Does anyone have any examples for doing this?

Thanks a million!

Rob
---------------------------------------------------------------------
Rob Newberry
Director of Fajita Technology
Group Logic, Inc.

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