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11/03/2009 at 10:15AM PST, ID: 24868137
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8.3

Problem getting handle via CreateFile() when opening a SCSI tape drive via \\.\TAPE0, but only when tape is busy running microsoft backup

Asked by dlethe in C++ Programming Language, Hard Drives & Storage, Windows MFC Programming

Tags: TAPE, Programming, SCSI, C, Windows programming

I am trying to perform some pass-through SCSI programming on my Windows-based Tape susbystem.  I want to open the tape in read-only mode so I can issue some CDBs to it.  Everything works fine unless the tape drive is running the microsoft backup program.

(Note, I have never had similar problems doing this under other operating systems, and I am performing pass-through SCSI commands that read log & mode pages. I am not trying to read media.  I know that the same tape drive has no problems doing this properly under other operating systems)

Here is my stripped down code
if (ReadWriteOpenRequired)
      handle = CreateFile("\\\\.\\TAPE0",GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_EXISTING,0,NULL);
else
      handle = CreateFile("\\\\.\\TAPE0",GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_READONLY,NULL);

The problem is that handle returns a -1.
I am running everything As administrator, and the code works fine if the tape is not busy.  

I know that there is a function, GetTapeStatus()  that can tell me if the tape is somehow locked in exclusive mode, but that function also needs to invoke CreateFile.  Am I missing something?  I am using VS2008.
[+][-]11/03/09 10:27 AM, ID: 25731879

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[+][-]11/03/09 10:29 AM, ID: 25731898

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[+][-]11/03/09 11:34 AM, ID: 25732596

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[+][-]11/03/09 11:36 AM, ID: 25732624

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[+][-]11/03/09 12:22 PM, ID: 25733147

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[+][-]11/03/09 12:25 PM, ID: 25733187

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[+][-]11/03/09 12:28 PM, ID: 25733220

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[+][-]11/03/09 12:47 PM, ID: 25733415

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[+][-]11/03/09 01:07 PM, ID: 25733659

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[+][-]11/03/09 01:09 PM, ID: 25733674

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[+][-]11/03/09 01:28 PM, ID: 25733949

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About this solution

Zones: C++ Programming Language, Hard Drives & Storage, Windows MFC Programming
Tags: TAPE, Programming, SCSI, C, Windows programming
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Solution Provided By: TapeDude
Participating Experts: 2
Solution Grade: A
 
 
 
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