C # Get RDC / RDP Session Information and Console

Question

I am trying to get the RDC / RDP and Console inputs information programmatically through C #.

I want to create a simple console application (.EXE) so that I can get information from the Task Manager → Users tab of any remote computer in our domain (Windows Server 2003 x86 or 2008R2 x64).

Indicates whether a person is registered on the server directly (for example, the Console) or through RDC / RDP (including the client, if it is still active) or disconnected if it is "paused" (ie they did not log out, but simply temporarily closed the windows RDC / RDP)

I have administrator rights on all servers and you can configure any Windows services / firewalls that should be enabled / disabled (if required)

I think I should probably use WMI (using System.Management), but the examples I found from Google only extract the existing user.

//Method 1 var searcher = new ManagementObjectSearcher( "SELECT UserName FROM Win32_ComputerSystem"); var collection = Searcher.Get(); foreach(ManagementObject entry in collection) { Console.WriteLine(entry["UserName"]); } //Method 2 string computer = "somecomputername"; var searcher = new ManagementObjectSearcher( computer + @"root\CIMV2", "SELECT * FROM Win32_TerminalService"); var collection = Searcher.Get(); foreach(ManagementObject entry in collection) { //Write them out (although usernames isnt listed from the example I found) } 

Answer 1

This will give you everything you need. Just call ListSessions and pass the server name. For more information about the session, pass ServerName and SessionId to GetSessionInfo .

 using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices; namespace TerminalTools { public class TermServicesManager { [DllImport("wtsapi32.dll")] static extern IntPtr WTSOpenServer([MarshalAs(UnmanagedType.LPStr)] String pServerName); [DllImport("wtsapi32.dll")] static extern void WTSCloseServer(IntPtr hServer); [DllImport("Wtsapi32.dll")] public static extern bool WTSQuerySessionInformation(IntPtr hServer, int sessionId, WTS_INFO_CLASS wtsInfoClass, out System.IntPtr ppBuffer, out uint pBytesReturned); [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); [StructLayout(LayoutKind.Sequential)] private struct WTS_SESSION_INFO { public Int32 SessionID; [MarshalAs(UnmanagedType.LPStr)] public String pWinStationName; public WTS_CONNECTSTATE_CLASS State; } [StructLayout(LayoutKind.Sequential)] public struct WTS_CLIENT_ADDRESS { public uint AddressFamily; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)] public byte[] Address; } [StructLayout(LayoutKind.Sequential)] public struct WTS_CLIENT_DISPLAY { public uint HorizontalResolution; public uint VerticalResolution; public uint ColorDepth; } public enum WTS_CONNECTSTATE_CLASS { Active, Connected, ConnectQuery, Shadow, Disconnected, Idle, Listen, Reset, Down, Init } public enum WTS_INFO_CLASS { InitialProgram = 0, ApplicationName = 1, WorkingDirectory = 2, OEMId = 3, SessionId = 4, UserName = 5, WinStationName = 6, DomainName = 7, ConnectState = 8, ClientBuildNumber = 9, ClientName = 10, ClientDirectory = 11, ClientProductId = 12, ClientHardwareId = 13, ClientAddress = 14, ClientDisplay = 15, ClientProtocolType = 16 } private static IntPtr OpenServer(string Name) { IntPtr server = WTSOpenServer(Name); return server; } private static void CloseServer(IntPtr ServerHandle) { WTSCloseServer(ServerHandle); } public static List<TerminalSessionData> ListSessions(string ServerName) { IntPtr server = IntPtr.Zero; List<TerminalSessionData> ret = new List<TerminalSessionData>(); server = OpenServer(ServerName); try { IntPtr ppSessionInfo = IntPtr.Zero; Int32 count = 0; Int32 retval = WTSEnumerateSessions(server, 0, 1, ref ppSessionInfo, ref count); Int32 dataSize = Marshal.SizeOf(typeof(WTS_SESSION_INFO)); Int64 current = (int)ppSessionInfo; if (retval != 0) { for (int i = 0; i < count; i++) { WTS_SESSION_INFO si = (WTS_SESSION_INFO)Marshal.PtrToStructure((System.IntPtr)current, typeof(WTS_SESSION_INFO)); current += dataSize; ret.Add(new TerminalSessionData(si.SessionID, si.State, si.pWinStationName)); } WTSFreeMemory(ppSessionInfo); } } finally { CloseServer(server); } return ret; } public static TerminalSessionInfo GetSessionInfo(string ServerName, int SessionId) { IntPtr server = IntPtr.Zero; server = OpenServer(ServerName); System.IntPtr buffer = IntPtr.Zero; uint bytesReturned; TerminalSessionInfo data = new TerminalSessionInfo(); try { bool worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ApplicationName, out buffer, out bytesReturned); if (!worked) return data; string strData = Marshal.PtrToStringAnsi(buffer); data.ApplicationName = strData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ClientAddress, out buffer, out bytesReturned); if (!worked) return data; WTS_CLIENT_ADDRESS si = (WTS_CLIENT_ADDRESS)Marshal.PtrToStructure((System.IntPtr)buffer, typeof(WTS_CLIENT_ADDRESS)); data.ClientAddress = si; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ClientBuildNumber, out buffer, out bytesReturned); if (!worked) return data; int lData = Marshal.ReadInt32(buffer); data.ClientBuildNumber = lData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ClientDirectory, out buffer, out bytesReturned); if (!worked) return data; strData = Marshal.PtrToStringAnsi(buffer); data.ClientDirectory = strData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ClientDisplay, out buffer, out bytesReturned); if (!worked) return data; WTS_CLIENT_DISPLAY cd = (WTS_CLIENT_DISPLAY)Marshal.PtrToStructure((System.IntPtr)buffer, typeof(WTS_CLIENT_DISPLAY)); data.ClientDisplay = cd; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ClientHardwareId, out buffer, out bytesReturned); if (!worked) return data; lData = Marshal.ReadInt32(buffer); data.ClientHardwareId = lData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ClientName, out buffer, out bytesReturned); strData = Marshal.PtrToStringAnsi(buffer); data.ClientName = strData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ClientProductId, out buffer, out bytesReturned); Int16 intData = Marshal.ReadInt16(buffer); data.ClientProductId = intData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ClientProtocolType, out buffer, out bytesReturned); intData = Marshal.ReadInt16(buffer); data.ClientProtocolType = intData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.ConnectState, out buffer, out bytesReturned); lData = Marshal.ReadInt32(buffer); data.ConnectState = (WTS_CONNECTSTATE_CLASS)Enum.ToObject(typeof(WTS_CONNECTSTATE_CLASS), lData); worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.DomainName, out buffer, out bytesReturned); strData = Marshal.PtrToStringAnsi(buffer); data.DomainName = strData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.InitialProgram, out buffer, out bytesReturned); strData = Marshal.PtrToStringAnsi(buffer); data.InitialProgram = strData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.OEMId, out buffer, out bytesReturned); strData = Marshal.PtrToStringAnsi(buffer); data.OEMId = strData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.SessionId, out buffer, out bytesReturned); lData = Marshal.ReadInt32(buffer); data.SessionId = lData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.UserName, out buffer, out bytesReturned); strData = Marshal.PtrToStringAnsi(buffer); data.UserName = strData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.WinStationName, out buffer, out bytesReturned); strData = Marshal.PtrToStringAnsi(buffer); data.WinStationName = strData; worked = WTSQuerySessionInformation(server, SessionId, WTS_INFO_CLASS.WorkingDirectory, out buffer, out bytesReturned); strData = Marshal.PtrToStringAnsi(buffer); data.WorkingDirectory = strData; } finally { WTSFreeMemory(buffer); buffer = IntPtr.Zero; CloseServer(server); } return data; } } public class TerminalSessionData { public int SessionId; public TermServicesManager.WTS_CONNECTSTATE_CLASS ConnectionState; public string StationName; public TerminalSessionData(int sessionId, TermServicesManager.WTS_CONNECTSTATE_CLASS connState, string stationName) { SessionId = sessionId; ConnectionState = connState; StationName = stationName; } public override string ToString() { return String.Format("{0} {1} {2}", SessionId, ConnectionState, StationName); } } public class TerminalSessionInfo { public string InitialProgram; public string ApplicationName; public string WorkingDirectory; public string OEMId; public int SessionId; public string UserName; public string WinStationName; public string DomainName; public TermServicesManager.WTS_CONNECTSTATE_CLASS ConnectState; public int ClientBuildNumber; public string ClientName; public string ClientDirectory; public int ClientProductId; public int ClientHardwareId; public TermServicesManager.WTS_CLIENT_ADDRESS ClientAddress; public TermServicesManager.WTS_CLIENT_DISPLAY ClientDisplay; public int ClientProtocolType; } }