public static ConnectionState GetConnectionState(ITerminalServerHandle server, int sessionId)
{
ProcessSessionCallback <ConnectionState> callback =
delegate(IntPtr mem, int returned) { return((ConnectionState)Marshal.ReadInt32(mem)); };
return(QuerySessionInformation(server, sessionId, WTS_INFO_CLASS.WTSConnectState, callback));
}
public static T QuerySessionInformationForStruct <T>(ITerminalServerHandle server, int sessionId,
WTS_INFO_CLASS infoClass) where T : struct
{
ProcessSessionCallback <T> callback =
delegate(IntPtr mem, int returned) { return((T)Marshal.PtrToStructure(mem, typeof(T))); };
return(QuerySessionInformation(server, sessionId, infoClass, callback));
}
public static string QuerySessionInformationForString(ITerminalServerHandle server, int sessionId,
WTS_INFO_CLASS infoClass)
{
ProcessSessionCallback <string> callback =
delegate(IntPtr mem, int returned) { return(Marshal.PtrToStringAuto(mem)); };
return(QuerySessionInformation(server, sessionId, infoClass, callback));
}
private static T QuerySessionInformation <T>(ITerminalServerHandle server, int sessionId,
WTS_INFO_CLASS infoClass, ProcessSessionCallback <T> callback)
{
int returned;
IntPtr mem;
if (NativeMethods.WTSQuerySessionInformation(server.Handle, sessionId, infoClass, out mem, out returned))
{
try
{
return(callback(mem, returned));
}
finally
{
NativeMethods.WTSFreeMemory(mem);
}
}
else
{
throw new Win32Exception();
}
}
private static T QuerySessionInformation <T>(ITerminalServerHandle server, int sessionId, WTS_INFO_CLASS infoClass, ProcessSessionCallback <T> callback)
{
int returned;
IntPtr buffer = IntPtr.Zero;
try
{
if (NativeMethods.WTSQuerySessionInformation(server.Handle, sessionId, infoClass, out buffer, out returned))
{
return(callback(buffer, returned));
}
else
{
throw new Win32Exception();
}
}
finally
{
if (buffer != IntPtr.Zero)
{
NativeMethods.WTSFreeMemory(buffer);
buffer = IntPtr.Zero;
}
}
}
public static int QuerySessionInformationForClientBuildNumber(ITerminalServerHandle server, int sessionId)
{
ProcessSessionCallback <int> callback = delegate(IntPtr mem, int returned) { return(Marshal.ReadInt32(mem)); };
return(QuerySessionInformation(server, sessionId, WTS_INFO_CLASS.WTSClientBuildNumber, callback));
}
private static T QuerySessionInformation <T>(int sessionId, WTS_INFO_CLASS infoClass, ProcessSessionCallback <T> callback)
{
int returned;
IntPtr mem;
if (WTSQuerySessionInformation(IntPtr.Zero, sessionId, infoClass, out mem, out returned))
{
try
{
return(callback(mem, returned));
}
finally
{
if (mem != IntPtr.Zero)
{
WTSFreeMemory(mem);
}
}
}
throw new Win32Exception();
}
