.NET (Core and Framework)

Re: How to get WindowsIdentity from domain\ username without password?

18-Dec-08 23:42

I can get WindowsIdentity with this Function:

[DllImport("advapi32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern bool LogonUser(string lpszUsername,
string lpszDomain, string lpszPassword, int dwLogonType,
int dwLogonProvider, ref IntPtr phToken);

private static WindowsIdentity getWindowsIdentity(string userName, string Domain, string Password)
{
bool posix = ((int) Environment.OSVersion.Platform == 128);
WindowsIdentity user = null;
try
{
if (posix)
{
user = new WindowsIdentity(userName);
}
else
{
IntPtr token = IntPtr.Zero;
LogonUser(userName, Domain, Password, 2, 0, ref token);
if (token == IntPtr.Zero)
{
return null;
}
user = new WindowsIdentity(token);
}
}
catch (Exception ex)
{
return null;
}

return user;
}
But I want to get WindowIdentity with only Domain\UserName argument?
Thanks for any idea !

QuynhTD

Dave Kreskowiak19-Dec-08 4:14

Re: How to get WindowsIdentity from domain\ username without password?

19-Dec-08 4:14

Wow. That's alot of code to do this:

string userName = Environment.UserName;
string userDomain = Environment.UserDomainName;

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Doan Quynh19-Dec-08 15:24

Re: How to get WindowsIdentity from domain\ username without password?

19-Dec-08 15:24

No, I don't want those information. I want to get WindowsIdentity object from username.
I want to have a function that :
WindowsIdentity identity = GetWindowsIdentityFromUserName(string userName) ???

QuynhTD

Dave Kreskowiak19-Dec-08 15:45

Re: How to get WindowsIdentity from domain\ username without password? [modified]

19-Dec-08 15:45

OK, I misunderstood what you were after. .NET 2.0 and above has the System.Windows.Principle namespace, but that WindowsIdentity class can only return the currently logged on entity, unless your attached to a Windows 2003 domain.

What are you trying to do with this??

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Doan Quynh19-Dec-08 16:18

Re: How to get WindowsIdentity from domain\ username without password?

19-Dec-08 16:18

In fact I want to get,set all permission (Read, write, ..in FileSystemRights) in Folder's ACL of one user on WinNT.
I solved it but I have to get WindowsIdentity object of user . Here is the code:

public  void SetFolderPermission(string userName, string fullPath, AccessControlType accessControlType,
                                             FileSystemRights fileAccessPermisson)
      {
          var dInfo = new DirectoryInfo(fullPath);

          DirectorySecurity dSecurity = dInfo.GetAccessControl();
          dSecurity.AddAccessRule(new FileSystemAccessRule(userName, fileAccessPermisson,
                                                           InheritanceFlags.ContainerInherit |
                                                           InheritanceFlags.ObjectInherit, PropagationFlags.None,
                                                           accessControlType));
          dInfo.SetAccessControl(dSecurity);
      }

      public  void RemoveAllFolderPermission(string userName, string fullPath, string password, string domain)
      {
          WindowsIdentity _principal = getWindowsIdentity(userName, domain, password);
          if (_principal == null)
          {
              throw new Exception("Invalid domain\\username or password");
              return;
          }

          var dInfo = new DirectoryInfo(fullPath);

          DirectorySecurity dSecurity = dInfo.GetAccessControl();

          AuthorizationRuleCollection acl = dSecurity.GetAccessRules
              (true, true, typeof (SecurityIdentifier));
          int count = acl.Count;
          int i = 0;
          while (i < count)
          {
              var rule =
                  (FileSystemAccessRule) acl[i];

              if (_principal.User.Equals(rule.IdentityReference))
              {
                  dSecurity.RemoveAccessRule(rule);
              }
              i++;
          }

          dInfo.SetAccessControl(dSecurity);
      }

      [DllImport("advapi32.dll", CallingConvention = CallingConvention.StdCall)]
      public static extern bool LogonUser(string lpszUsername,
                                          string lpszDomain, string lpszPassword, int dwLogonType,
                                          int dwLogonProvider, ref IntPtr phToken);

      private static WindowsIdentity getWindowsIdentity(string userName, string Domain, string Password)
      {
          bool posix = ((int) Environment.OSVersion.Platform == 128);
          WindowsIdentity user = null;
          try
          {
              if (posix)
              {
                  user = new WindowsIdentity(userName);
              }
              else
              {
                  IntPtr token = IntPtr.Zero;
                  LogonUser(userName, Domain, Password, 2, 0, ref token);
                  if (token == IntPtr.Zero)
                  {
                      return null;
                  }
                  user = new WindowsIdentity(token);
              }
          }
          catch (Exception ex)
          {
              return null;
          }

          return user;
      }

Maybe do that with out using WindowsIdentity ???

QuynhTD

modified on Friday, December 19, 2008 11:47 PM

Dave Kreskowiak20-Dec-08 4:17

Re: How to get WindowsIdentity from domain\ username without password?

20-Dec-08 4:17

The code for setting the folder permission is good, but since removing a permission is just about the same as setting it, you'd have to think that code would be about the same size. I hate to say that you solved the problem, but went way beyond what's required to get the job done.

Have a look at this example[^] discussion.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Doan Quynh21-Dec-08 19:49

Free Help from Microsoft for Your Windows Client Applications

21-Dec-08 19:49

OK, your ideals are very helpful. Thank u very much!
Rdgs,

QuynhTD

vb,net buttons

chathini18-Dec-08 20:35

chathini

18-Dec-08 20:35

how to add an image into a botton?? its like how to show a image of a printer rather than a "print"??

Re: vb,net buttons

Thulasee Shan19-Dec-08 0:54

Thulasee Shan

19-Dec-08 0:54

use the Image property in the property window or use Button1.Image to assign dynamically.

VB6.0 to VB.NET

sntkn18-Dec-08 20:11

sntkn

18-Dec-08 20:11

Hi... how to convert code in vb6.0 into vb.net

Re: VB6.0 to VB.NET

Oshtri Deka18-Dec-08 21:13

Oshtri Deka

18-Dec-08 21:13

Try to find some tool for that.
I will risk to act like an smart-ass, but just google for it.
This one was first result on my list.
http://www.artinsoft.com/pr_vbcompanion.aspx?gclid=CI2jjdaczJcCFQJKtAodGFj0Qg[^]

Re: VB6.0 to VB.NET

Dragonfly_Lee24-Dec-08 19:01

Dragonfly_Lee

24-Dec-08 19:01

Be ready for some potential issues. Smile | :)

Tan Li

I Love KongFu~

brucedkyle18-Dec-08 19:03

brucedkyle

18-Dec-08 19:03

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ThreadPool not executing queued jobs

Helfdane18-Dec-08 3:14

Helfdane

18-Dec-08 3:14

Hi,

I'm working on a calculation module which handles a lot of small calculations. A sqeuencial approach is not feasible due to the amount of calculations (the biggest batch is approximately 15 million calculations) and my initial run projected 83 days in the worst case scenario. This is too long.

Since the threadpool is described as a good solution for many short calculations, I decided to give it a try. My implementation works on a small scale (15k calculations) and performs acceptable given 40 threads (dual-core, so max ideal number is max 50 according to the msdn documentation, but then the system threads are starving and timers run out of sync and GC freezes).

My only problem is, when I feed my small jobs to the queue, it fills the first batch of empty threads and then continues queuing, but *not* executing the jobs which are queued for processing. At a certain point, on the small scale, it has completed queuing, and *then* it starts processing the requests very fast. This is not sustainable, since when filling the queue, the system slowly grinds to a halt queuing slower per job.

To get an idea of a run: one calculation costs 25-500ms to complete, around 15 calculations per context, and about 1 million contexts to be processed per run.

Anyone can help me find an answer why the threadpool continues to queue but not process the queued jobs until the queuing is complete? Thanks in advance.

The consumer isn't a moron; she is your wife.

led mike18-Dec-08 7:05

18-Dec-08 7:05

Helfdane wrote:
Anyone can help me find an answer why the threadpool continues to queue but not process the queued jobs until the queuing is complete? Thanks in advance.

Even if they can, you are chasing the wrong problem. With only two cores you are not gaining anything by trying to pool a million operations. There is a logical maximum benefit of running twice as fast by using both cores equally. However you cannot attain the maximum because there is overhead of managing the pool and context switching between threads and other resources being used by the system.

You might be better off just creating two threads and splitting your operations in half running half in each thread.

Since you did not mention it, I should ask if you know about distributed computing? This would be the most common solution using PC's to reduce a 83 day workload.

led mike

Helfdane18-Dec-08 21:53

Helfdane

18-Dec-08 21:53

Thank you and Dave for your replies.

Distributed computing is not an option, since it's an application that is installed at the customer and has to run standalone (it's a critical application where most clients prefer to hook it off the network).

About the threads, I was only following the MSDN documentation where they mention that 25 threads per core is the max ideal number where the overhead would still be smaller than the improvement per thread.

I forgot to mention, each calculation *might* need some additional information from the DB, hence the threading.

My problem is not the load or the number of threads, they are parameters on an existing infrastructure. My question is, why the threads are not working (are they on hold/in wait?) while queuing the jobs (is this infrastructure the right one?). Since you and Dave Kreskowiak propose less threads which I can agree on, the queuing will still be there, thus my problem still exists as the queuing still takes time while the threads do nothing (cpu load during queuing is not above 40%, so the other 60% should be used to do the first calculations but it doesn't use the 60% unless queuing is completed).

The consumer isn't a moron; she is your wife.

led mike19-Dec-08 7:15

19-Dec-08 7:15

Helfdane wrote:
the MSDN documentation where they mention that 25 threads per core is the max ideal number where the overhead would still be smaller than the improvement per thread.

Yes but for what use model? Threading is mostly related to multi-user processing. You want to maximize threads in that use model to share the compute cycles across users so that they don't wait one at a time for a reply. This is not your use model.

Helfdane wrote:
why the threads are not working (are they on hold/in wait?)

Debugging threaded code is difficult when you are there, we are not. We are mostly guessing at this based on the information you have provided. One thing we do not know is how many jobs you queued. You threw out some numbers like 15 million. That's a large number for a PC. Given your use model I would research using two threads and a design that allows each thread to process half the calculations.

Resources are another issue when you start talking numbers like 15 million. I would wonder how much resources each calculation requires, I mean if there is some source data used for each calculation and you load all 15 million calculation resources at once you probably start having a lot of paging which slows everything down, as opposed to getting the resources only when needed.

I don't know what your experience and background is but writing efficient code requires a lot of in depth knowledge and experience. You have to understand hardware as well as software. Most of that is beyond my expertise, but I do understand you can't just read a threading article to get up to speed.

led mike

Helfdane21-Dec-08 23:27

Helfdane

21-Dec-08 23:27

You have valid points, thanks for your input.

We are talking a multi-user environment, that is, multiple users can do a request for a number of calculations (there is one dispatcher which processes the requests by transforming it into the format used by the calculation engine. This dispatcher will probably have a WCF component for the thin clients to talk to, this is not final yet. In addition, the dispatcher will have the possibility of throttling the requests if the queue becomes too big, but that is something I haven't worked out yet; it's still on the drawing board). The dispatcher is designed to also monitor the system resources, as on which it will base his throttling and batching strategy. This should lessen the preassure on the hardware as well.

The test-case I had was 15k calculations (1000 base calculations with 15 subcalculations each in testing data). This means that when the calculation starts, 15k calculations are in the queue. The thing which hints me that nothing is happening is, that when queuing the first action of a calculation, the calculation routine is sending a notification to the console that it is starting, but the starting message never gets there unless queuing is done and so is the load.

I am not sure if my current infrastructure will be sufficient, hence my research and these forum postings, as I am not sure if I want to use a component (the threadpool in this case) where I cannot predict exactly what will happen. I think I do need threading since missing parts required for a calculation need to be fetched from the DB and/or are dependant on other calculations.

My background is saas with an average load of 500+ simultanious connections for clients who operate globally. My background is not primarily with .net.

The consumer isn't a moron; she is your wife.

Dave Kreskowiak18-Dec-08 8:21

18-Dec-08 8:21

Helfdane wrote:
performs acceptable given 40 threads

40 threads on a dual core? It can perform better if you use few threads. Under that load, you're spending an awful lot of time doing context switching going from thread to thread to thread.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

led mike18-Dec-08 8:35

18-Dec-08 8:35

Didn't I say that? Confused | :confused:

led mike

Dave Kreskowiak18-Dec-08 9:03

18-Dec-08 9:03

Sometimes is multiple people tell him the same thing, it might sink in that it's not a good idea. Big Grin | :-D

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

led mike18-Dec-08 9:05