using System;
using System.Collections.Generic;
using System.Text;
using System.IO.Ports;

namespace MediaControl.Logic
{

    public partial class RS232Logic
    {
        /// <summary>
        /// Sends a Hex Command to a RS232 Device
        /// </summary>
        public static void SendCommand(string HexCommand, string ComPort, int BaudRate, Parity Parity, int DataBits, StopBits StopBits)
        {
            // Create Serial Port
            SerialPort sp = new SerialPort(ComPort, BaudRate, Parity, DataBits, StopBits);

            // Convert Hex Command into bytes
            byte[] HexBytes = HexStringConverter.ToByteArray(HexCommand);

            // Open serial port
            sp.Open();

            // send out the bytes
            sp.Write(HexBytes, 0, HexBytes.Length);

            // clean up
            sp.Close();
        }
    }
    /// <summary>
    /// Converts Hex Strings 
    /// </summary>
    static class HexStringConverter
    {
        /// <summary>
        /// Converts Hex Strings to byte arrays
        /// </summary>
        /// <param name="HexString">Hex number in string format</param>
        /// <returns>byte array</returns>
        public static byte[] ToByteArray(string HexString)
        {
            // Get HexString Length
            int NumberChars = HexString.Length; 
            
            // The Hex numbers come in pairs of 2 like "DF"
            // so the length of the byte array will naturally
            // be half the length of the hex string
            byte[] bytes = new byte[NumberChars / 2];

            // Loop through the hex numbers converting each character pair to byte
            for (int i = 0; i < NumberChars; i += 2)
            {
                bytes[i / 2] = Convert.ToByte(HexString.Substring(i, 2), 16);
            } 
            return bytes;
        }
    }
}