public static List <string> GetInteractiveUserList()
{
List <string> result = new List <string>();
IntPtr sessionInfoList = IntPtr.Zero;
int sessionCount = 0;
int retVal = SafeNativeMethods.WTSEnumerateSessions(SafeNativeMethods.WTS_CURRENT_SERVER_HANDLE, 0, 1, ref sessionInfoList, ref sessionCount);
if (retVal != 0)
{
int dataSize = Marshal.SizeOf(typeof(SafeNativeMethods.WTS_SESSION_INFO));
int currentSession = (int)sessionInfoList;
for (int x = 0; x < sessionCount; x++)
{
SafeNativeMethods.WTS_SESSION_INFO sessionInfo =
(SafeNativeMethods.WTS_SESSION_INFO)Marshal.PtrToStructure((IntPtr)currentSession, typeof(SafeNativeMethods.WTS_SESSION_INFO));
currentSession += dataSize;
uint bytes = 0;
IntPtr userInfo = IntPtr.Zero;
IntPtr domainInfo = IntPtr.Zero;
bool sResult = SafeNativeMethods.WTSQuerySessionInformation(SafeNativeMethods.WTS_CURRENT_SERVER_HANDLE, sessionInfo.SessionID, SafeNativeMethods.WTS_INFO_CLASS.WTSUserName, out userInfo, out bytes);
if (!sResult)
{
int Win32ErrorResult = Marshal.GetLastWin32Error();
SafeNativeMethods.WTSFreeMemory(sessionInfoList);
throw new Win32Exception(Win32ErrorResult, "WTSQuerySessionInformation");
}
string user = Marshal.PtrToStringAnsi(userInfo);
SafeNativeMethods.WTSFreeMemory(userInfo);
sResult = SafeNativeMethods.WTSQuerySessionInformation(SafeNativeMethods.WTS_CURRENT_SERVER_HANDLE, sessionInfo.SessionID, SafeNativeMethods.WTS_INFO_CLASS.WTSDomainName, out domainInfo, out bytes);
if (!sResult)
{
int Win32ErrorResult = Marshal.GetLastWin32Error();
SafeNativeMethods.WTSFreeMemory(sessionInfoList);
throw new Win32Exception(Win32ErrorResult, "WTSQuerySessionInformation");
}
string domain = Marshal.PtrToStringAnsi(domainInfo);
SafeNativeMethods.WTSFreeMemory(domainInfo);
if (!string.IsNullOrEmpty(domain))
{
result.Add(string.Format("{0}\\{1}", domain, user));
}
else if (!string.IsNullOrEmpty(user))
{
result.Add(user);
}
}
SafeNativeMethods.WTSFreeMemory(sessionInfoList);
}
return(result);
}
public static bool IsSessionLoggedOFF(int session)
{
SafeNativeMethods.WTS_SESSION_INFO sessionInfo = new SafeNativeMethods.WTS_SESSION_INFO();
// if WTSQuerySessionInformation returns false than the session is already closed
// WTSQuerySessionInformation returns zero if the session is logged off.
sessionInfo.State = SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSReset;
uint bytes = 0;
IntPtr userInfo = IntPtr.Zero;
bool sResult = SafeNativeMethods.WTSQuerySessionInformation(SafeNativeMethods.WTS_CURRENT_SERVER_HANDLE, session, SafeNativeMethods.WTS_INFO_CLASS.WTSConnectState, out userInfo, out bytes);
if (sResult)
{
int lData = Marshal.ReadInt32(userInfo);
sessionInfo.State = (SafeNativeMethods.WTS_CONNECTSTATE_CLASS)Enum.ToObject(typeof(SafeNativeMethods.WTS_CONNECTSTATE_CLASS), lData);
/*
switch (sessionInfo.State)
{
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSActive:
ret = "WTSActive";
break;
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSConnected:
ret = "WTSConnected";
break;
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSConnectQuery:
ret = "WTSConnectQuery";
break;
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSDisconnected:
ret = "WTSDisconnected";
break;
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSDown:
ret = "WTSDown";
break;
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSIdle:
ret = "WTSIdle";
break;
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSInit:
ret = "WTSInit";
break;
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSListen:
ret = "WTSListen";
break;
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSReset:
ret = "WTSReset";
break;
case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSShadow:
ret = "WTSShadow";
break;
}
*/
}
SafeNativeMethods.WTSFreeMemory(userInfo);
return (sessionInfo.State == SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSReset) ? true : false;
}
