Re: CFileDialog Does not show mapped files in system account

From:
"Tom Serface" <tom.nospam@camaswood.com>
Newsgroups:
microsoft.public.vc.language
Date:
Fri, 16 Mar 2007 08:28:55 -0700
Message-ID:
<OFjFg$9ZHHA.4832@TK2MSFTNGP02.phx.gbl>
I most of the time find mapped drives to be a bad way to go and I use UNC's
in my program whenever possible. The whole process breaks down quickly on a
client/server architecture where the server machine may have a different set
of mapped drives from the client. UNC's are a bit slower (don't know why),
but a whole lot more reliable and easier to resolve.

Tom

"Alex Blekhman" <xfkt@oohay.moc> wrote in message
news:%23SVxK69ZHHA.3984@TK2MSFTNGP02.phx.gbl...

"Larry Smith" wrote:

Drive mappings exist only under an accout, which created them. Read
"Remarks" section in documentation for `WNetAddConnection2' function.


That's not true actually. While this entire area is flaky (it has its
roots in the SMB=Server Message Block protocol), a drive mapping is a
machine-wide alias for a UNC path.


It was like this for WinNT/2K. Starting from WinXP/2K3 each user has its
own set of drives:

KB180362 - "INFO: Services and Redirected Drives"
http://support.microsoft.com/kb/180362/

<quote>
On Windows NT and on Windows 2000, drive letters are global to the system.
All users on the system share the letters A-Z. Each user does not get
their own set of drive letters. This means a user can access the
redirected drives of another user if they have the appropriate security
access.
</quote>

This is the exact situation that you describe. Following is description
for XP/2K3:

<quote>
On Windows XP and on Microsoft Windows Server 2003, each logon session
receives its own set of drive letters, A through Z. Therefore, redirected
drives cannot be shared between processes that are running under different
user accounts.
</quote>

Alex

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