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Posted 27 Oct 2003

Wake On Lan sample for C#

, 27 Oct 2003
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Wake On Lan utility using C#.

Introduction

It's strange but I failed to find on the Internet any WOL sample written in C#. So I spent some time making a program to that purpose. It's very simple but it works OK (in our intranet at least).

For waking computers, I use Magic Packet (MAC address of network adapter repeated 16 times).

The actual functionality is implemented like this:

Code

using System;
using System.Net.Sockets;

//we derive our class from a standart one
public class WOLClass:UdpClient    
{
    public WOLClass():base()
    { }
    //this is needed to send broadcast packet
    public void SetClientToBrodcastMode()    
    {
      if(this.Active)
       this.Client.SetSocketOption(SocketOptionLevel.Socket,
                                 SocketOptionName.Broadcast,0);
    }
 }
 
...
//now use this class
 //MAC_ADDRESS should  look like '013FA049'
 private void WakeFunction(string MAC_ADDRESS)   
 {
      WOLClass client=new WOLClass();
      client.Connect(new 
         IPAddress(0xffffffff),  //255.255.255.255  i.e broadcast
         0x2fff); // port=12287 let's use this one 
      client.SetClientToBrodcastMode();
      //set sending bites
      int counter=0;
      //buffer to be send
      byte[] bytes=new byte[1024];   // more than enough :-)
     //first 6 bytes should be 0xFF
     for(int y=0;y<6;y++)
        bytes[counter++]=0xFF;
     //now repeate MAC 16 times
     for(int y=0;y<16;y++)
     {
         int i=0;
         for(int z=0;z<6;z++)
         {
              bytes[counter++]= 
                  byte.Parse(MAC_ADDRESS.Substring(i,2),
                  NumberStyles.HexNumber);
              i+=2;
         }
     }

     //now send wake up packet
     int reterned_value=client.Send(bytes,1024);
 }

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

maxburov
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Comments and Discussions

 
QuestionNote - you need to adjust Network Adapter power settings Pin
navyjax218-Apr-17 9:21
membernavyjax218-Apr-17 9:21 
PraiseWorks just fine Pin
Jefferson Motta6-Apr-17 5:33
memberJefferson Motta6-Apr-17 5:33 
QuestionReturn values from WakeFunction ? Pin
Member 123079227-Feb-16 4:47
memberMember 123079227-Feb-16 4:47 
GeneralWorks. Pin
Member 154943823-Sep-14 22:57
memberMember 154943823-Sep-14 22:57 
QuestionNot working on my system.. Pin
Member 1002944612-May-13 22:58
memberMember 1002944612-May-13 22:58 
GeneralWorks with WOW Pin
David j rundle15-May-12 4:34
memberDavid j rundle15-May-12 4:34 
GeneralThanks! Pin
Anthraxx NL22-Jan-10 10:33
memberAnthraxx NL22-Jan-10 10:33 
GeneralOther example and some theory Pin
memos-software24-Jun-08 20:31
membermemos-software24-Jun-08 20:31 
GeneralError Pin
Christian Rasmussen11-Jun-08 3:11
memberChristian Rasmussen11-Jun-08 3:11 
GeneralRe: Error Pin
Ian_E15-Jun-08 12:35
memberIan_E15-Jun-08 12:35 
GeneralRe: Error Pin
Randy_Miller12-Jul-08 6:14
memberRandy_Miller12-Jul-08 6:14 
GeneralThanks! Pin
devcow11-Jun-07 7:16
memberdevcow11-Jun-07 7:16 
GeneralWorks great ! Pin
A.J.Bauer11-Mar-07 6:32
memberA.J.Bauer11-Mar-07 6:32 
Generalfor broadcasting Pin
plato2926-Jun-06 22:16
memberplato2926-Jun-06 22:16 
Hi,can you help me about acting broadcasting in udpclient for chat.
I run this code and give an error in line: client.Connect(new IPAddress(0xffffffff),0x2fff);
This error is:"can not connect to unreachable host".
Please help me to solve this problem!thanks.

Generalbroadcasting Pin
plato2926-Jun-06 21:42
memberplato2926-Jun-06 21:42 
GeneralIP Broadcasting Pin
Save My Soul - (SMS)27-Dec-05 22:29
memberSave My Soul - (SMS)27-Dec-05 22:29 
GeneralThanks for the sample Pin
Radoslav Bielik6-Jan-04 11:05
memberRadoslav Bielik6-Jan-04 11:05 

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