Copy File using duplicate handle

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I want to copy a file that is being used by "System" process[pid:4]
I iterated all the handles for this process and duplicated the handle for the file i required. now when i am reading the file using this handle it says "access denied"
is there any way to change the "share mode" using this duplicate handle so that I can read it?

Posted 24-Mar-11 2:36am

aquarianutsav

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2 solutions

Solution 2

CPallini is right. If the handle is not inheritable (which is the default), you can't use it from another process.

If you know the name of the file, you can try to open it with CreateFile and use FILE_SHARE_READ | FILE_SHARE_WRITE flags.

If you don't know the name of the file, you can try to get it from its handle there:
http://msdn.microsoft.com/en-us/library/aa366789(v=vs.85).aspx[^]

Posted 24-Mar-11 3:20am

Olivier Levrey

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Sergey Alexandrovich Kryukov 24-Mar-11 15:41pm

I agree, too. Good Answer, my 5.
--SA

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CPallini · Accepted Answer · 2011-03-24T02:42:00

Solution 1

Nope (as far as I know): that would be a security treat.

Posted 24-Mar-11 2:42am

CPallini

Comments

Sergey Alexandrovich Kryukov 24-Mar-11 15:40pm

I think your right. Shared more is granted, not grabbed. My 5.
--SA

mbue 24-Mar-11 15:47pm

Indeed! - sometimes there is a reason to open a file exclusive.
Regards.