using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

class Program
{
    const uint GENERIC_READ = 0x80000000;
    const uint GENERIC_WRITE = 0x40000000;
    const uint OPEN_EXISTING = 3;
    const int INVALID_HANDLE_VALUE = -1;

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern IntPtr CreateFile(
        string lpFileName,
        uint dwDesiredAccess,
        uint dwShareMode,
        IntPtr lpSecurityAttributes,
        uint dwCreationDisposition,
        uint dwFlagsAndAttributes,
        IntPtr hTemplateFile);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern int WriteFile(
        IntPtr hFile,
        byte[] lpBuffer,
        uint nNumberOfBytesToWrite,
        out uint lpNumberOfBytesWritten,
        IntPtr lpOverlapped);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern int CloseHandle(IntPtr hObject);

    static void Main()
    {
        string pipeName = @"\\.\pipe\MyNamedPipe";
        IntPtr hPipe;

        // Connect to the named pipe
        hPipe = CreateFile(pipeName, GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);

        if (hPipe.ToInt32() == INVALID_HANDLE_VALUE)
        {
            Console.WriteLine("Error connecting to named pipe: " + Marshal.GetLastWin32Error());
            return;
        }

        Console.WriteLine("Connected to named pipe.");

        // Read user input from the console and send it to the named pipe
        while (true)
        {
            Console.Write("Enter text to send to the named pipe (or 'exit' to quit): ");
            string input = Console.ReadLine();

            if (input.ToLower() == "exit")
                break;

            byte[] buffer = Encoding.ASCII.GetBytes(input);
            uint bytesWritten;

            if (WriteFile(hPipe, buffer, (uint)buffer.Length, out bytesWritten, IntPtr.Zero) == 0)
            {
                Console.WriteLine("Error writing to named pipe: " + Marshal.GetLastWin32Error());
                break;
            }
        }

        // Close the named pipe and exit
        CloseHandle(hPipe);
        Console.WriteLine("Named pipe closed.");
    }
}