RDP Farbtiefe auslesen

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Security;
using System.Net;

namespace WTS {
    public static class Sessions {
        public enum WTS_CONNECTSTATE_CLASS {
            WTSActive,
            WTSConnected,
            WTSConnectQuery,
            WTSShadow,
            WTSDisconnected,
            WTSIdle,
            WTSListen,
            WTSReset,
            WTSDown,
            WTSInit
        }
        public enum WTS_INFO_CLASS
        {
             WTSInitialProgram,
             WTSApplicationName,
             WTSWorkingDirectory,
             WTSOEMId,
             WTSSessionId,
             WTSUserName,
             WTSWinStationName,
             WTSDomainName,
             WTSConnectState,
             WTSClientBuildNumber,
             WTSClientName,
             WTSClientDirectory,
             WTSClientProductId,
             WTSClientHardwareId,
             WTSClientAddress,
             WTSClientDisplay,
             WTSClientProtocolType,
             WTSIdleTime,
             WTSLogonTime,
             WTSIncomingBytes,
             WTSOutgoingBytes,
             WTSIncomingFrames,
             WTSOutgoingFrames,
             WTSClientInfo,
             WTSSessionInfo
        }
        
        [StructLayout(LayoutKind.Sequential)]
        private struct WTS_CLIENT_ADDRESS
        {
            public uint AddressFamily;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
            public byte Address;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct WTS_SESSION_INFO_1 {
            public Int32 ExecEnvId;
            public WTS_CONNECTSTATE_CLASS State;
            public Int32 SessionId;
            [MarshalAs(UnmanagedType.LPStr)]
            public String pSessionName;
            [MarshalAs(UnmanagedType.LPStr)]
            public String pHostName;
            [MarshalAs(UnmanagedType.LPStr)]
            public String pUserName;
            [MarshalAs(UnmanagedType.LPStr)]
            public String pDomainName;
            [MarshalAs(UnmanagedType.LPStr)]
            public String pFarmName;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct WTS_CLIENT_DISPLAY {
            public int HorizontalResolution;
            public int VerticalResolution;
            public int ColorDepth;
        }

        [DllImport("wtsapi32.dll", SetLastError = true)]  
        static extern IntPtr WTSOpenServer([MarshalAs(UnmanagedType.LPStr)] String pServerName);

        [DllImport("wtsapi32.dll")]  
        static extern void WTSCloseServer(IntPtr hServer);

        [DllImport("Wtsapi32.dll", SetLastError = true), SuppressUnmanagedCodeSecurity]  
        static extern int WTSEnumerateSessionsEx(IntPtr hServer, ref int pLevel, int Filter, ref IntPtr ppSessionInfo, ref int pCount);

        [DllImport("wtsapi32.dll", SetLastError = true)]  
        static extern bool WTSQuerySessionInformation(IntPtr hServer, int sessionId, WTS_INFO_CLASS wtsInfoClass, out IntPtr ppBuffer, out int pBytesReturned);

        [DllImport("wtsapi32.dll")]  
        static extern void WTSFreeMemory(IntPtr pMemory);

        public class TerminalSession {
            public int SessionId;
            public WTS_CONNECTSTATE_CLASS SessionState;
            public string Host;
            public string SessionName;
            public string UserName;
            public object RemoteHost;
            public string DomainName;
            public string FarmName;
            public int ClientHorizontalResolution;
            public int ClientVerticalResolution;
            public string ClientColorDepth;
        }

        public static List<TerminalSession> GetTSSessions(string Server = "") {  
            IntPtr server = IntPtr.Zero;
            List<TerminalSession> result = new List<TerminalSession>();
            if (Server != "") {  
                server = WTSOpenServer(Server);
            }
            try {

                IntPtr ppSessionInfo = IntPtr.Zero;
                Int32 count = 0;
                Int32 pLevel = 1;
                Int32 retval = WTSEnumerateSessionsEx(server, ref pLevel, 0, ref ppSessionInfo, ref count);
                Int32 dataSize = Marshal.SizeOf(typeof(WTS_SESSION_INFO_1));
                Int64 current = (Int64)ppSessionInfo;
                IntPtr buffer;
                int strLen;
                Hashtable colordepths = new Hashtable() {{ 1, "4bit"},{ 2, "8bit"},{ 4, "16bit"},{ 8, "24bit"},{ 16, "15bit"},{ 24, "24bit"},{ 32, "32bit"}};  

                if (retval != 0) {
                    for (int i = 0; i < count; i++) {
                        WTS_SESSION_INFO_1 si = (WTS_SESSION_INFO_1)Marshal.PtrToStructure((IntPtr)current, typeof(WTS_SESSION_INFO_1));
                        current += dataSize;
                        
                        // get remote host information
                        object remotehost = null;
                        if (WTSQuerySessionInformation(server,si.SessionId ,WTS_INFO_CLASS.WTSClientAddress, out buffer, out strLen) && strLen > 1){
                            WTS_CLIENT_ADDRESS c_address  = (WTS_CLIENT_ADDRESS)Marshal.PtrToStructure(buffer, typeof(WTS_CLIENT_ADDRESS));
                            if (c_address.AddressFamily == 2 && c_address.Address[2] != 0){
                                // AF_INET (IPv4 address)
                                remotehost = new IPAddress(new byte {c_address.Address[2],c_address.Address[3],c_address.Address[4],c_address.Address[5]});
                            } else if (c_address.AddressFamily == 23){
                                // AF_INET6 (IPv6 address)
                                byte bv6 = new byte[16];
                                Array.Copy(c_address.Address,2,bv6,0,16);
                                remotehost = new IPAddress(bv6);
                            } else {
                                remotehost = new IPAddress(new byte {0,0,0,0});
                            }
                            WTSFreeMemory(buffer);
                        }
                        // get remote display information
                        WTS_CLIENT_DISPLAY oClientDisplay = new WTS_CLIENT_DISPLAY();
                        if (WTSQuerySessionInformation(server,si.SessionId ,WTS_INFO_CLASS.WTSClientDisplay, out buffer, out strLen) && strLen > 1){
                            oClientDisplay = (WTS_CLIENT_DISPLAY)Marshal.PtrToStructure(buffer, oClientDisplay.GetType());
                            WTSFreeMemory(buffer);
                        }

                        result.Add(new TerminalSession() {
                            SessionId = si.SessionId,
                            SessionState = si.State,
                            SessionName = si.pSessionName,
                            Host = Server,
                            RemoteHost = remotehost,
                            UserName = si.pUserName,
                            DomainName = si.pDomainName,
                            FarmName = si.pFarmName,
                            ClientHorizontalResolution = oClientDisplay.HorizontalResolution, 
                            ClientVerticalResolution = oClientDisplay.VerticalResolution,
                            ClientColorDepth = (string)colordepths[oClientDisplay.ColorDepth]
                        });
                    }

                    WTSFreeMemory(ppSessionInfo);
                }
            }catch(Exception ex) {
                throw new Exception(ex.Message);
            } finally {
                WTSCloseServer(server);
            }
            return result;
        }
    }
}
'  
[WTS.Sessions]::GetTSSessions('localhost')