这是我对这个问题的看法：
using System;using System.Collections.Generic;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( IntPtr hServer, int sessionId, WTS_INFO_CLASS wtsInfoClass, out 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(Environment.MachineName); } public static void ListUsers(string serverName) { IntPtr serverHandle = IntPtr.Zero; List<string> resultList = new List<string>(); serverHandle = WTSOpenServer(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)); IntPtr currentSession = 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(userPtr); WTSFreeMemory(domainPtr); } WTSFreeMemory(sessionInfoPtr); } } finally { WTSCloseServer(serverHandle); } } }}
