Accessing Netwok Shares

  • Thread starter Thread starter diephouse
  • Start date Start date
D

diephouse

I seem to be having a problem accessing networks shares. For example,
I try the following code:

File.Exists(@"\\SERVER\share");

always returns false! Or even if I map the drive

File.Exists(@"Z:\")

that will always return false as well. I can't seem to find too much
information on this. I can access the drive/share through windows
explorer so I don't understand what the problem is... any ideas?

- Dan
 
Here's the clincher: the program works fine when run from the command
line. But the program is actually being launced from a printer a
printer driver. The printer driver does a _wspawn() and launches my c#
program.

I don't think printer drivers can access network shares for whateve
reason. Anyway around this????

- Dan
 
This may be a permission/mapping problem most likely due to the fact
that the printer driver is spawning the application under a different
user/credentials.
You may need to use WindowsIdentity.Impersonate to impersonate a
windows user with higher authentication and/or a Windows user that has
the drive mapped
Click to expand...

So I've been running some tests to figure out what the issue is and I'm
confounded about one portion of it. I created a C# test program which
prints the following to a textbox:

textBox1.Text += "Z Directory exists: " + Directory.Exists("z:\\") + "\r\n";
textBox1.Text += "\\\\wing\\data Directory exists: " +
Directory.Exists("\\\\wing\\data") + "\r\n";
textBox1.Text += "User: " + WindowsIdentity.GetCurrent().Name + "\r\n";
textBox1.Text += "Is Auth: " +
WindowsIdentity.GetCurrent().IsAuthenticated + "\r\n";
textBox1.Text += "Is System: " +
WindowsIdentity.GetCurrent().IsSystem + "\r\n";

I've mapped \\wing\data to z:, so I would expect the same output for
both Directory.Exists("z:\\") and Directory.Exists("\\\\wing\\data").
And it does - but as soon as I throw an impersonate() in there - even if
I'm impersonating myself, Z:\ doesn't exist but \\\\wing\\data does.

Output before impersonating myself:
Z Directory exists: True
\\wing\data Directory exists: True
User: DELL\Dan
Is Auth: True
Is System: False

Output after impersonating myself:
Z Directory exists: False
\\wing\data Directory exists: True
User: DELL\Dan
Is Auth: True
Is System: False

Why does Z:\ cease to exist!?

Bonus question: is it possible to give the NT SYSTEM account access to
z:\? Thanks,

- Dan
 
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