using System;
using System.Runtime.InteropServices;

namespace FileTransfer
{
    class WtsApi32
    {

        [DllImport("Wtsapi32.dll", SetLastError = true)]
        public static extern bool WTSVirtualChannelWrite(IntPtr channelHandle, byte[] data, int length, ref int bytesWritten);

        [DllImport("Wtsapi32.dll", SetLastError = true)]
        public static extern bool WTSVirtualChannelRead(IntPtr channelHandle, uint TimeOut, byte[] data, int length, ref int bytesReaded);

        [DllImport("Wtsapi32.dll")]
        public static extern IntPtr WTSVirtualChannelOpen(IntPtr server, int sessionId, [MarshalAs(UnmanagedType.LPStr)] string virtualName);

        [DllImport("Wtsapi32.dll")]
        public static extern bool WTSVirtualChannelClose(IntPtr channelHandle);

        public enum VirtualClass
        {
            ClientData,
            FileHandle
        };

        [DllImport("Wtsapi32.dll", SetLastError = true)]
        public static extern bool WTSVirtualChannelQuery(IntPtr channelHandle, VirtualClass virtualClass, out IntPtr buffer, ref uint bytesReturned);

        [DllImport("Wtsapi32.dll", SetLastError = true)]
        public static extern void WTSFreeMemory(IntPtr memory);
    }
}