Wake-on-LAN

using System;
using System.Net.Sockets;
using System.Net;
using System.Collections.Generic;

namespace Wol
{
    class Program
    {
        static void Main(string[] args)
        {
            using (UdpClient udpClient = new UdpClient())
            {
                Console.WriteLine("Enter mac address");
                byte[] mac = StrToMac(Console.ReadLine());
                udpClient.Send(mac, mac.Length, new IPEndPoint(IPAddress.Broadcast, 9));
            }
        }

        static byte[] StrToMac(string s)
        {
            List<byte> arr = new List<byte>(102);

            string[] macs = s.Split(' ', ':', '-');

            for (int i = 0; i < 6; i++)
                arr.Add(0xff);

            for (int j = 0; j < 16; j++)
                for (int i = 0; i < 6; i++)
                    arr.Add(Convert.ToByte(macs[i], 16));

            return arr.ToArray();
        }
    }
}

unit WOL;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, IdBaseComponent,IdComponent,IdUDPBase,IdUDPClient,IdGlobal,
  StdCtrls;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

type
  TMACAddress = packed record
    case integer of
    0: (s1,s2,s3,s4,s5,s6 : byte; );
    1: (cmp1:word; cmp2:integer;);
  end;

  TWakeupMagicPacket = packed record
    FillFF : array [0..5] of byte;
    Mac  : array [0..15] of TMACAddress;
  end;

function TryStrToMac(str:string; var mac:TMACAddress):boolean;
var a,b:integer;
const ToHex = '0123456789ABCDEF';
begin
  Result:=false;
  str:=AnsiUpperCase(trim(str));
  if length(str)<17 then begin
    mac.cmp1:=0;
    mac.cmp2:=0;
    exit;
  end;
  a:=pos(str[1],ToHex)-1; b:=pos(str[2],ToHex)-1;
  if((a>=0)and(b>=0)and(str[3]='-')) then mac.s1:=a*16+b else exit;
  a:=pos(str[4],ToHex)-1; b:=pos(str[5],ToHex)-1;
  if((a>=0)and(b>=0)and(str[6]='-')) then mac.s2:=a*16+b else exit;
  a:=pos(str[7],ToHex)-1; b:=pos(str[8],ToHex)-1;
  if((a>=0)and(b>=0)and(str[9]='-')) then mac.s3:=a*16+b else exit;
  a:=pos(str[10],ToHex)-1; b:=pos(str[11],ToHex)-1;
  if((a>=0)and(b>=0)and(str[12]='-')) then mac.s4:=a*16+b else exit;
  a:=pos(str[13],ToHex)-1; b:=pos(str[14],ToHex)-1;
  if((a>=0)and(b>=0)and(str[15]='-')) then mac.s5:=a*16+b else exit;
  a:=pos(str[16],ToHex)-1; b:=pos(str[17],ToHex)-1;
  if((a>=0)and(b>=0)) then mac.s6:=a*16+b else exit;
  Result:=true;
end;

function TryWakeUpComputer(const MacAddress: string):boolean;
var i      : integer;
    mac    : TMACAddress;
    pkt    : TWakeupMagicPacket;
begin
  Result := false;
  if not TryStrToMac(MacAddress,mac) then exit;
  FillChar(pkt.FillFF[0],SizeOf(pkt.FillFF),$FF);
  for i:=0 to High(pkt.Mac) do pkt.Mac[i]:=mac;
  with TIdUDPClient.Create(nil) do try
    BroadcastEnabled := True;
    Host := '255.255.255.255';
    Port := 9;
    SendBuffer(pkt,sizeof(pkt));
    Result := true;
  finally
    Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if not TryWakeUpComputer(Edit1.Text) then  \\Мак вида BC-AE-C5-8E-0A-2C
  begin
    // Do something...
showmessage('ERROR');
  end;
end;