• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 838
  • Last Modified:

VB6: Problem regarding the API Function NetShareGetInfo

Hello experts,
in my VB6 program I encountered the following problem:

Problem regarding the API Function  NetShareGetInfo:
If a user myuser has the following rights (permissions) on a share  \\ComputerName\test_data
  Full Control                   not allowed
  Modify                          allowed
  Read & Execute             allowed
  List Folder Contents       allowed
  Read                            allowed
  Write                           allowed
  Special Permissions       not allowed
the API Function NetShareGetInfo returns the Return Code ERROR_ACCESS_DENIED (=5).

But it is possible to establish a connection to this share using the user myuser on my computer;
and the files can be modified, ...

What could be wrong
or
is there another way to determine wether the share \\ComputerName\test_data is available?

I have used the Visual Basic program for the NetShareGetInfo API Function which can be found at:
  http://www.mentalis.org/apilist/NetShareGetInfo.shtml

If anyone knows a solution,
please supply an appropriate code snippet.
Thank you very much.

  HStrix


0
HStrix
Asked:
HStrix
  • 6
  • 5
1 Solution
 
Shiju SasidharanCommented:
0
 
Shiju SasidharanCommented:
Hi

For  Connecting to Network Resources try this link

http://vbnet.mvps.org/index.html?code/network/netconnect.htm

For Enumerating Local Network Resources via WNetEnumResource follow this link

http://vbnet.mvps.org/index.html?code/network/wnetenumresource.htm


;-)
Shiju
0
 
HStrixAuthor Commented:
Thanks Shiju,
but it doesn't solve my problem.
I want to check if a share is available.
I know the computer name, I know the share name, I know the user name.
I can access the share using the explorer-tools menu point.
But the API says the "Access_DENIED".
I want to get rid of this.
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
Shiju SasidharanCommented:
Hi
Have u set any password for the user 'Myuser'?

;-)
Shiju
0
 
Shiju SasidharanCommented:
i went through this link
http://www.mentalis.org/apilist/NetShareGetInfo.shtml

that code worked properly when i tried.

R u sure u have set the read permission for that user ?

;-)
Shiju

0
 
HStrixAuthor Commented:

The user 'myuser' has enough permission (read/write) accessing the share.
The user 'myuser' requires a password.
I establish the connection to the share using 'establish connection using mydomain\myuser/mypassword'.
And so it works.

But I want to check the connection programmatically.

I'm logged in as user 'mylocaluser' and not as 'myuser'.
It seems that this is the cause?
But how can I provide 'myuser' (or 'mydomain\myuser') and its password for NetShareGetInfo?
'myuser' is NOT a local user, it is a user in a domain (active directory).
My computer is NOT in the domain mydomain.
0
 
Shiju SasidharanCommented:
hi HStrix

u need to map it to a drive letter.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wnet/wnet/wnetaddconnection2.asp

using this you can specify the name and password.  You can use GetLogicalDrives to get a bitmap of the drive letters that are in use

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base/getlogicaldrives.asp

;-)
Shiju
0
 
HStrixAuthor Commented:
Thanks Shiju,
I understand what you mean.
"u need to map it to a drive letter." seems to be eqivalent to the connection  process.
This sounds that there is NO other way to check the availability of a share.

Then the process could be:
- check all drive letters for a share name
- if the share doesn't exist
  - check for an unused drive letter (could be a problem)
  - add this share using domain, user, pw and share name
- if the share already exists
  - check if the connection is possible <== how?
Is this sequence OK?

In addition:
How about using an UNC path and check if an access (connection) is possible?
This would be closer to the process I originally wanted to implement.
In this case I don't need to take care about the existing drive letters.
Do you have any suggestion for this?



0
 
HStrixAuthor Commented:
I found some useful information to solve the issue on
- Retrieving User, Share and Share User Name for Network Resources:
  http://vbnet.mvps.org/index.html?code/network/wnetdemo.htm
- How to check access rights to file/directory on NTFS volume in Windows NT/2000/XP:
  http://www.smsoft.ru/en/checkfileaccess.htm
I used the information from these pages to solve the issue for mapped drives.

Still open for me is "How to get simular information in case for UNC pathes".
0
 
HStrixAuthor Commented:
Thanks Shiju,
your comments did not completely solve the issue,
but they helped me coming toward a solution.

  HStrix
0
 
Shiju SasidharanCommented:
Hi HSrix

Thank u for giving the points & 
also for providing the link
  http://vbnet.mvps.org/index.html?code/network/wnetdemo.htm

regards

;-)
Shiju
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

  • 6
  • 5
Tackle projects and never again get stuck behind a technical roadblock.
Join Now