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(Environment.MachineName);
Console.ReadKey();
} 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 = ;
Int32 retVal = WTSEnumerateSessions(serverHandle, , , ref SessionInfoPtr, ref sessionCount);
Int32 dataSize = Marshal.SizeOf(typeof(WTS_SESSION_INFO));
Int32 currentSession = (int)SessionInfoPtr;
uint bytes = ; if (retVal != )
{
for (int i = ; 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(string.Format("SessionID : {0} Domain : {1} User : {2} StationName : {3} State : {4}",
si.SessionID, Marshal.PtrToStringAnsi(domainPtr), Marshal.PtrToStringAnsi(userPtr), si.pWinStationName, si.State)); WTSFreeMemory(userPtr);
WTSFreeMemory(domainPtr);
} WTSFreeMemory(SessionInfoPtr);
}
}
finally
{
CloseServer(serverHandle);
} } }

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