C# Signature:
[DllImport("wtsapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
static extern IntPtr WTSOpenServer(string pServerName);
VB Signature:
User-Defined Types:
None.
Notes:
As always, only do SetLastError=true if you actually intend to call GetLastError.
Tips & Tricks:
Please add some!
Sample Code:
[DllImport(@"wtsapi32.dll", SetLastError=true)]
static extern IntPtr WTSOpenServer(string serverName);
[DllImport(@"wtsapi32.dll", SetLastError=true)]
static extern bool WTSEnumerateSessions(
IntPtr hServer,
int Reserved,
int Version,
out IntPtr SessionInfo,
ref int Count
);
StructLayout (LayoutKind.Sequential, CharSet=CharSet.Ansi)]
public struct WTS_SESSION_INFO
{
public int SessionId;
public string pWinStationName;
public WTS_CONNECTSTATE_CLASS State;
}
public enum WTS_CONNECTSTATE_CLASS
{
/// <summary>
/// user is logged on to the WinStation.
/// </summary>
WTSActiveWTSActiveA,
/// <summary>
/// The WinStation is connected to the client.
/// </summary>
WTSConnectedWTSConnected,
/// <summary>
/// The WinStation is in the process of connecting to the client.
/// </summary>
WTSConnectQueryWTSConnectQuery,
/// <summary>
/// The WinStation is shadowing another WinStation.
/// </summary>
WTSShadowWTSShadow,
/// <summary>
/// The WinStation is active but the client is disconnected.
/// </summary>
WTSDisconnectedWTSDisconnected,
/// <summary>
/// The Win Station is waiting for a client to connect.
/// </summary>
WTSIdleWTSIdle,
/// <summary>
/// The WinStation is listening for a connection. A listener session waits for requests for new client connections.
/// No user is logged on a listener session. A listener session cannot be reset, shadowed, or changed to a regular client session.
/// </summary>
WTSListenWTSListen,
/// <summary>
/// The WinStation is being reset.
/// </summary>
WTSResetWTSReset,
/// <summary>
/// The WinStation is down due to an error.
/// </summary>
WTSDownWTSDown,
/// <summary>
/// The WinStation is initializing.
/// </summary>
WTSInitWTSInit
}
public WTS_SESSION_INFO[] GetSessions(string serveName)
{
WTS_SESSION_INFO[] sessionInfos;
int Count=0;
IntPtr hServer = new IntPtr(0);
hServer = WTSOpenServer(serveName);
if(hServer == IntPtr.Zero)
{
int ret = Marshal.GetLastWin32Error();
string msg = string.Format("\nError: [{0}] {1}\n", ret, GetErrorMessage(ret));
throw new ApplicationException(msg);
}
IntPtr ppSessionInfos = new IntPtr(0);
int sizeOfSessionInfo = Marshal.SizeOf(typeof(WTS_SESSION_INFO));
WTSEnumerateSessions(hServer, 0, 1,out ppSessionInfos, ref Count);
sessionInfos = new WTS_SESSION_INFO[Count];
for(int i=0; i < Count; i++)
{
sessionInfos[i] = (WTS_SESSION_INFO)Marshal.PtrToStructure(ppSessionInfos, typeof(WTS_SESSION_INFO));
}
return sessionInfos;
}
Alternative Managed API:
Do you know one? Please contribute it!
