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c#wpfwindowswindows-services
Syed Waqas
Syed Waqas

Reputation: 862

How to get current windows username from windows service in multiuser environment using .NET

I have a windows service which run a WPF application all the time for all the logged in users which works fine, now in the WPF application i can not get a current username as Environment.UserName; returns 'SYSTEM' which is understandable. so what i thought was to find session id of current process which could be retrieved by Process.GetCurrentProcess().SessionId and then get the list of all users logged in to the machine and looping through it to find the session id match with process session id and later his username.

but i don't how to get the list of all logged in users or i would appreciate if someone can help me with alternative.

Upvotes: 0

Views: 11222

Answers (6)

Igor
Igor

Reputation: 17

You can try this Code:

string username = "SYSTEM";
var explorer = Process.GetProcessesByName("explorer").FirstOrDefault();
if (explorer != null)
{
    username = GetUsername(explorer.SessionId);
}

Implementation of method GetUsername here: https://stackoverflow.com/a/35810391/10412686

Upvotes: 0

Tola Ch.
Tola Ch.

Reputation: 198

You can try this Code spinet. Whenever a user logged onto windows, the Username attribute will contain the username of the user. In the case when there are no users in the windows system, there will be no instances of the Win32_ComputerSystem class.

ManagementScope ms = new ManagementScope("\\\\.\\root\\cimv2");
ObjectQuery query = new ObjectQuery("SELECT * FROM Win32_ComputerSystem");
ManagementObjectSearcher searcher = new ManagementObjectSearcher(ms, query);
foreach(ManagementObject mo in searcher.Get())
{
    Console.WriteLine(mo["UserName"].ToString());
}

Upvotes: 1

Soma Mbadiwe
Soma Mbadiwe

Reputation: 1674

I ran into a similar problem while building a Windows Service. Just like you, I had the Session ID and needed to get the corresponding username. Syed's answer above did not work on my machine (Windows 10) as Microsoft seems to have removed the quser executable. After several unsuccessful solution hereon SO, I ran into this particular answer and it inspired my solution:

Here's my code (all of them residing inside a class; in my case, the class inheriting ServiceBase)

    [DllImport("Wtsapi32.dll")]
    private static extern bool WTSQuerySessionInformation(IntPtr hServer, int sessionId, WtsInfoClass wtsInfoClass, out IntPtr ppBuffer, out int pBytesReturned);
    [DllImport("Wtsapi32.dll")]
    private static extern void WTSFreeMemory(IntPtr pointer);

    private enum WtsInfoClass
    {
        WTSUserName = 5, 
        WTSDomainName = 7,
    }

    private static string GetUsername(int sessionId, bool prependDomain = true)
    {
        IntPtr buffer;
        int strLen;
        string username = "SYSTEM";
        if (WTSQuerySessionInformation(IntPtr.Zero, sessionId, WtsInfoClass.WTSUserName, out buffer, out strLen) && strLen > 1)
        {
            username = Marshal.PtrToStringAnsi(buffer);
            WTSFreeMemory(buffer);
            if (prependDomain)
            {
                if (WTSQuerySessionInformation(IntPtr.Zero, sessionId, WtsInfoClass.WTSDomainName, out buffer, out strLen) && strLen > 1)
                {
                    username = Marshal.PtrToStringAnsi(buffer) + "\\" + username;
                    WTSFreeMemory(buffer);
                }
            }
        }
        return username;
    }

Upvotes: 3

Syed Waqas
Syed Waqas

Reputation: 862

I solve it by executing powershell command "quser" in my WPF application which returns all the logged in users then I am iterating to find session id in which the application is running with user session id and then retrieving his name. below is the function which fetch the username by passing his session id

 private string GetUserName(int SessionId)
        {
            try
            {
                Runspace runspace = RunspaceFactory.CreateRunspace();
                runspace.Open();

                Pipeline pipeline = runspace.CreatePipeline();
                pipeline.Commands.AddScript("Quser");
                pipeline.Commands.Add("Out-String");

                Collection<PSObject> results = pipeline.Invoke();

                runspace.Close();

                StringBuilder stringBuilder = new StringBuilder();
                foreach (PSObject obj in results)
                {
                    stringBuilder.AppendLine(obj.ToString());
                }

                foreach (string User in stringBuilder.ToString().Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries).Skip(1))
                {
                    string[] UserAttributes = User.Split(new string[]{" "},StringSplitOptions.RemoveEmptyEntries);
                    if (int.Parse(UserAttributes[2].Trim()) == SessionId)
                    {
                        return UserAttributes[0].Replace(">", string.Empty).Trim();
                    }
                }

                return stringBuilder.ToString();
            }
            catch (Exception ex)
            {
            }

            return string.Empty;
        }

the function can be called by 

string CurrentUser = GetUserName(Process.GetCurrentProcess().SessionId);

Upvotes: 1

Shamim
Shamim

Reputation: 444

i made a little search and find this code that should work for you:
it will get the username whom is running the process...
reference: How do I determine the owner of a process in C#?

public string GetProcessOwner(string processName)
{
string query = "Select * from Win32_Process Where Name = \"" + processName + "\"";
ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);
ManagementObjectCollection processList = searcher.Get();

foreach (ManagementObject obj in processList)
{
    string[] argList = new string[] { string.Empty, string.Empty };
    int returnVal = Convert.ToInt32(obj.InvokeMethod("GetOwner", argList));
    if (returnVal == 0)
    {
        // return DOMAIN\user
        string owner = argList[1] + "\\" + argList[0];
        return owner;       
    }
}

return "NO OWNER";
}

Upvotes: 0

pKami
pKami

Reputation: 354

Found this solution on MSDN forums:

using System.Security.Principal;
.
.
.
WindowsPrincipal wp = new WindowsPrincipal(WindowsIdentity.GetCurrent());
String username = wp.Identity.Name;

Now this is easily tested by creating a new Console Application, pasting the above code, and writing the username string to Console. Seems to work fine, but for services it's apparently a more complex situation. Since all services are run in a container that runs under the SYSTEM user, that's what they return. For more information see the below link, esp. all Harry Zhu's answers.

http://social.msdn.microsoft.com/Forums/vstudio/en-US/3be119b0-88b4-442e-9613-6856cbb27adb/how-can-i-get-current-username-in-windows-service?forum=csharpgeneral

It would seem it's not possible to achieve what you are trying to get, as services are totally seperate from users' session.

Upvotes: 0

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