public static WTS_USER_INFO[] EnumerateUsers(string serverName = null)
{
var list = new List <WTS_USER_INFO>();
serverName = serverName ?? Environment.MachineName;
var serverHandle = OpenServer(serverName);
try
{
var sessionInfoPtr = IntPtr.Zero;
var sessionCount = 0;
var retVal = WtsApi32.WTSEnumerateSessions(serverHandle, 0, 1, ref sessionInfoPtr, ref sessionCount);
var dataSize = Marshal.SizeOf(typeof(WTS_SESSION_INFO));
var currentSession = (long)sessionInfoPtr;
if (retVal != 0)
{
for (int i = 0; i < sessionCount; i++)
{
var si = (WTS_SESSION_INFO)Marshal.PtrToStructure((IntPtr)currentSession, typeof(WTS_SESSION_INFO));
currentSession += dataSize;
IntPtr userPtr;
IntPtr domainPtr;
uint bytes;
WtsApi32.WTSQuerySessionInformation(serverHandle, si.SessionID, WTS_INFO_CLASS.WTSUserName, out userPtr, out bytes);
WtsApi32.WTSQuerySessionInformation(serverHandle, si.SessionID, WTS_INFO_CLASS.WTSDomainName, out domainPtr, out bytes);
var userName = Marshal.PtrToStringAnsi(userPtr);
var domainName = Marshal.PtrToStringAnsi(domainPtr);
var info = new WTS_USER_INFO
{
State = si.State,
Domain = domainName,
UserName = userName,
SessionID = si.SessionID
};
list.Add(info);
}
WtsApi32.WTSFreeMemory(sessionInfoPtr);
}
}
finally
{
CloseServer(serverHandle);
}
return(list.ToArray());
}
public static void CloseServer(IntPtr ServerHandle)
{
WtsApi32.WTSCloseServer(ServerHandle);
}
public static IntPtr OpenServer(String Name)
{
IntPtr server = WtsApi32.WTSOpenServer(Name); return(server);
}