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Coding

Spry with HTML codes/CDATA in XML

by Ben
written by Ben

I was assigned with a mini project to do a team notice board that read XML files using Spry.
While reading plain text in the XML is straightforward,  reading of HTML codes like <br> tag, <b> tag are not.

<?xml version="1.0" encoding="utf-8"?>
<posts>
	<post>
		<msg>This is a <strong>message</strong></msg>
	</post>
</posts>

<msg>This is a <strong>message</strong></msg>

When you type these tags(e.g. strong tag as above) in the XML, it simply ‘breaks’ the XML formatting and would thus caused an error when it is loaded with Spry

So… to input HTML data in XML…

1. Use CDATA wrapper in your XML 

		<msg>
			<![CDATA[
			This is a <strong>message</strong>
			]]>
		</msg>

2. Set setColumnType(“msg”, “html”) to your Spry dataset for that field

var ds1 = new Spry.Data.XMLDataSet("data.xml", "posts/post");
ds1.setColumnType("msg", "html");

Spry with HTML Data Source Code

Spry with HTML Data Online Demo

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Networking

Wake-On-Lan with Dlink DIR 655 over the internet

by Ben
written by Ben

Wake-on-lan allow a computer to turn on automatically over the network by sending some magic packet. See wiki.

There are some requirements in order to turn on WOL. In brief, they are

  1. On a wired LAN (read: ethernet card ans not those WIFI card)
  2. Turn on WOL feature in BIOS and windows driver
  3. A compatible router that can forward/send magic packet (WOL information) to network

For more details, you may want to check out on lifehacker.

I think you can find most of the general information on WOL on the internet but setting up WOL with Dlink DIR 655 isnt that straighforward.

Unlike a tomato firmware where you can login to the router admin page and click on a button to wake it up, there is no specific tool or page available in DIR655. Thus, you would need to go to some online website such as Depicius , type in the information and send the magic packet to your router ip address.

One common mistake with most users is that they thought the magic packet must be send to the target machine ip address to wake up. Unfortunately, this isnt the case with WOL. In WOL concept, a magic packet must be broadcast to a subnet  by specifying an ip address ended with .255 . i.e. 192.168.0.255 or 10.0.0.255. Upon sending this packet over the network, network card which belongs to this subnet will then pick up the magic packet and retrieve the mac address from it. If the mac address belongs to itself, it will boot the machine up.

And here’s how to setup WOL in Dlink

1. Login to your router Admin Page (e.g. 192.168.0.1)

2. Go to ‘Advanced’ tab

3. Under ‘Virtual Server’, tick one of the checkbox and type in the below information

Name: <Any name>

IP Address : <your subnet ending with .255> In my case it is 192.168.0.255

Port (Public and Private) : 7

Protocol : UDP

Schedule: Always

Inbound Filter : Allow All

Dlink 655 WOL setup
Dlink 655 WOL setup

4. Save the setting, reboot the router, off your machine

5. Go to Depicius http://www.depicus.com/wake-on-lan/woli.aspx

6. Type in your IP address, Mac address, Subnet(i.e. 255.255.255.255) and Port number (i.e. 7) and click wake on lan button

7. Your machine should boot up!

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