Detecting Users in a machine for a Roaming profile

Question

Hi,

I am trying to do an application which will detect user which is Roaming which is in that particular machine but the attached code below will always return no user although I am in that machine.

Please help.

Thanks.

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace EnumerateRDUsers
{

    class Program
    {
        [DllImport("wtsapi32.dll")]     
        static extern IntPtr WTSOpenServer([MarshalAs(UnmanagedType.LPStr)] String pServerName);     
        [DllImport("wtsapi32.dll")] static extern void WTSCloseServer(IntPtr hServer);      
        [DllImport("wtsapi32.dll")] static extern Int32 WTSEnumerateSessions(IntPtr hServer, [MarshalAs(UnmanagedType.U4)] Int32 Reserved, [MarshalAs(UnmanagedType.U4)] Int32 Version, ref IntPtr ppSessionInfo, [MarshalAs(UnmanagedType.U4)] ref Int32 pCount);      [DllImport("wtsapi32.dll")] static extern void WTSFreeMemory(IntPtr pMemory);      [DllImport("Wtsapi32.dll")] static extern bool WTSQuerySessionInformation(System.IntPtr hServer, int sessionId, WTS_INFO_CLASS wtsInfoClass, out System.IntPtr ppBuffer, out uint pBytesReturned);      [StructLayout(LayoutKind.Sequential)]     private struct WTS_SESSION_INFO { public Int32 SessionID;        [MarshalAs(UnmanagedType.LPStr)] public String pWinStationName; public WTS_CONNECTSTATE_CLASS State;     } public enum WTS_INFO_CLASS { WTSInitialProgram, WTSApplicationName, WTSWorkingDirectory, WTSOEMId, WTSSessionId, WTSUserName, WTSWinStationName, WTSDomainName, WTSConnectState, WTSClientBuildNumber, WTSClientName, WTSClientDirectory, WTSClientProductId, WTSClientHardwareId, WTSClientAddress, WTSClientDisplay, WTSClientProtocolType } public enum WTS_CONNECTSTATE_CLASS { WTSActive, WTSConnected, WTSConnectQuery, WTSShadow, WTSDisconnected, WTSIdle, WTSListen, WTSReset, WTSDown, WTSInit }

        static void Main(string[] args)
        {
            ListUsers("ServerA");
        }
              
        
        public static IntPtr OpenServer(String Name)
        {
            IntPtr server = WTSOpenServer(Name);
            return server;
        }
        
        public static void CloseServer(IntPtr ServerHandle)
        {
            WTSCloseServer(ServerHandle);
        }
        
        public static void ListUsers(String ServerName)
        {
            IntPtr serverHandle = IntPtr.Zero;
            List<String> resultList = new List<string>();
            serverHandle = OpenServer(ServerName);
            
            try
            {
                IntPtr SessionInfoPtr = IntPtr.Zero;
                IntPtr userPtr = IntPtr.Zero;
                IntPtr domainPtr = IntPtr.Zero;
                Int32 sessionCount = 0;
                Int32 retVal = WTSEnumerateSessions(serverHandle, 0, 1, ref SessionInfoPtr, ref sessionCount);
                Int32 dataSize = Marshal.SizeOf(typeof(WTS_SESSION_INFO));
                Int32 currentSession = (int)SessionInfoPtr;
                uint bytes = 0;
                if (retVal != 0)
                {
                    for (int i = 0; i < sessionCount; i++)
                    {
                        WTS_SESSION_INFO si = (WTS_SESSION_INFO)Marshal.PtrToStructure((System.IntPtr)currentSession, typeof(WTS_SESSION_INFO));
                        currentSession += dataSize; WTSQuerySessionInformation(serverHandle, si.SessionID, WTS_INFO_CLASS.WTSUserName, out userPtr, out bytes);
                        WTSQuerySessionInformation(serverHandle, si.SessionID, WTS_INFO_CLASS.WTSDomainName, out domainPtr, out bytes);
                        Console.WriteLine("Domain and User: " + Marshal.PtrToStringAnsi(domainPtr) + "\\" + Marshal.PtrToStringAnsi(userPtr));
                    } WTSFreeMemory(SessionInfoPtr);
                }
            }
            finally
            {
                CloseServer(serverHandle);
            }
        }
    }
}

Answer 1

Hi,

I am moving your thread into the Windows Desktop SDK Forum for dedicated support.
Have a nice day,

---

Leo Liu [MSFT]
MSDN Community Support | Feedback to us

Answer 2

Hi guys,

Anyone have any methods to detect users in OS just like Quser in command prompt in code?

Thanks.