public static string GetUsernameFromSessionId(uint sessionId)
{
var username = string.Empty;
if (WTSAPI32.WTSQuerySessionInformation(IntPtr.Zero, sessionId, WTSAPI32.WTS_INFO_CLASS.WTSUserName,
out var buffer, out var strLen) && strLen > 1)
{
username = Marshal.PtrToStringAnsi(buffer);
WTSAPI32.WTSFreeMemory(buffer);
}
return(username);
}
public static List <WindowsSession> GetActiveSessions()
{
var sessions = new List <WindowsSession>();
var consoleSessionId = Kernel32.WTSGetActiveConsoleSessionId();
sessions.Add(new WindowsSession
{
ID = consoleSessionId,
Type = SessionType.Console,
Name = "Console",
Username = GetUsernameFromSessionId(consoleSessionId)
});
var ppSessionInfo = IntPtr.Zero;
var count = 0;
var enumSessionResult = WTSAPI32.WTSEnumerateSessions(WTSAPI32.WTS_CURRENT_SERVER_HANDLE, 0, 1,
ref ppSessionInfo, ref count);
var dataSize = Marshal.SizeOf(typeof(WTSAPI32.WTS_SESSION_INFO));
var current = ppSessionInfo;
if (enumSessionResult != 0)
{
for (var i = 0; i < count; i++)
{
var sessionInfo =
(WTSAPI32.WTS_SESSION_INFO)Marshal.PtrToStructure(current, typeof(WTSAPI32.WTS_SESSION_INFO));
current += dataSize;
if (sessionInfo.State == WTSAPI32.WTS_CONNECTSTATE_CLASS.WTSActive &&
sessionInfo.SessionID != consoleSessionId)
{
sessions.Add(new WindowsSession
{
ID = sessionInfo.SessionID,
Name = sessionInfo.pWinStationName,
Type = SessionType.RDP,
Username = GetUsernameFromSessionId(sessionInfo.SessionID)
});
}
}
}
return(sessions);
}