Opera Omnia: Tom Pennings' Blog

Facebook for iOS version 4.0 - Upgrade Issues

2011-10-11T01:14:00.002+02:00

People updating their Facebook app on iPhone to version 4.0 might experience "freezes" and "lockups" after launching the app. The blue Facebook launch screen (sometimes with the spinning icon) will persist, though nothing further seems to happen. In some cases even the "Home" and "Power" button will stop responding causing the phone to lock up completely.

The only solution is to wait for the iPhone to "recover" (usually after the SpingBoard crashes and relaunches itself), and follow these steps after you regain control over the device:

Double-click the Home button to display recently used apps
Hold one of those apps, until they all start to wiggle
Close all the recently used apps
Click the Home button to stop the wiggling
Click the Home button again to close the recently used apps
Hold the Facebook app, till all the apps start wiggling
Delete the Facebook app (and all of its data)
Power off the iPhone by pressing (and holding) the Power button
Restart the iPhone by pressing the Power button
Re-install the Facebook app using the App Store app on the iPhone
Launch the Facebook app
Provide your Email/Password and log in

Note: Seemingly only the iPhone and iPod Touch are affected (not the iPad), and only when upgrading the Facebook app

Checksums for official iOS builds (SHA1)

2010-09-12T16:05:00.000+02:00

Apple sure doesn't make it very easy if you're one of the iOS users that prefers to roll back to a prior release on your iPod Touch, iPhone or iPad. Even if you were able to save the SHSH blob for your device in combination with a certain build in Cydia or by using TinyUmbrella, you would still need to get the binary firmware bits from Apple. Just in case you happened to have gotten a build from a different source, here's where you can get SHA1's for the official releases. Simply run this command on the file (in OS X) and compare it to this list:

/usr/bin/openssl sha1 /Users/test/Downloads/iPhone2,1_4.1_8B117_Restore.ipsw

Gmail, IE8 and Content-Disposition attachment

2010-09-10T20:38:00.004+02:00

For a while now Gmail makes use of a very user-friendly way to show picture attachments in e-mails.

The "View" link allows you to look at the photo within the browser, and the "Download" link causes the file to be saved to your local harddrive. For the novice user this type of "preview" with clear indications on how to look at, and how to save the file is way more intuitive than the commonly used paperclip icon.

Intrigued by this design I wondered if one could create a rich text e-mail with some CSS and provide the same type of "user interface", but instead of attaching the file, include links to a cloud service (e.g. Amazon S3). That way you can shift the load of the attachments from the e-mail server to the cloud service, process more e-mails in a shorter amount of time, and get the e-mail quicker to the customer (in case of a photo service).

The implementation was fairly simple: include a thumbnail, and create two links to Amazon S3. The "View" link would connect to a URL on S3 with the metadata Content-Disposition set to inline. And the "Download" link would associate with a URL on S3 with the metadata Content-Disposition set to attachment. It worked fine except for one case: Gmail in combination with Internet Explorer. When clicking the "Download" link, Gmail seems to get completely confused and unless you completely shut down IE, there is no way to get back to your inbox.

These are the steps I used to produce the issue:

Open Hotmail (or any other mail client that allows sending Rich Text e-mails with hyperlinks).
Compose a message with a hyperlink to: https://s3.amazonaws.com/lautumar.bug/ie8_gmail_bug.jpg
This link refers to a file on Amazon S3 with the Content-Disposition set to attachment.
Send this e-mail to a Gmail account.
Open Internet Explorer, surf to http://www.gmail.com and log in.
Open the e-mail message you composed earlier.
Click on the hyperlink pointed to S3.
With the default security settings, a new window will open but with the following security warning "To help protect your security, Internet Explorer blocked this site from downloading files to your computer. Click here for options.".
Click on the message and choose "Download File...".
The window will now show "Copyright 2002-2010 Google Inc." with a bunch of javascript errors. No file gets downloaded.
More importantly when trying to access Gmail by typing http://www.gmail.com in the address bar you will now get "Connection Problem" in IE. Or simply get logged out of Gmail.
The only way to get Gmail to work is to shutdown and restart IE.

For those interested in following the status on this issue: there's a bug report on the Gmail Help Forum where you can "Star" the problem and stay up to date.

Mobile Vikings and iPhone: Cellular Data, MMS and Internet Tethering settings

2010-09-10T13:48:00.004+02:00

After installing iOS 4.1, released by Apple this past wednesday, Mobile Vikings customers will need to re-enter their Cellular Data Network configuration on their iPhones in order to use the internet, MMS and Internet Tethering. As long as Apple won't provide a Mobile Vikings IPCC file this will continue to happen for each firmware update (so be warned for iOS 4.2 in November). In order to make life easier I've included all settings with screenshots:

Choose: Settings > General > Network > Cellular Data Network

Cellular Data

APN web.be
Username web
Password web

MMS

APN mms.be
Username mms
Password mms
MMSC http://mmsc.be
MMS Proxy 217.72.235.1:8080
MMS Max Message Size 300000
MMS UA Prof URL

Internet Tethering

APN web.be
Username web
Password web

Carrier settings for Mobile Vikings on iPhone OS 3.1.3

2010-02-10T00:22:00.006+01:00

These steps will explain how to install a custom IPCC onto your iPhone for enabling tethering, MMS, voicemail and mobile internet on the Mobile Vikings network. Moreover it will show the infamous Vikings carrier logo and replace the IPCC (iPhone bundle) from June 4th of last year.

Before you start make sure you have an official unlocked iPhone 3G/3GS (not jailbroken), with the latest firmware on the Mobile Vikings network. You can verify this on your iPhone by going to Settings/General/About and confirm the Version field to be 3.1.3 (7E18) or higher.

If your iPhone meets those specifications, please follow these steps:

Download the latest IPCC by right clicking and selecting "Save Link As"/"Download Linked File As" on this link: MobileVikings_be.ipcc
When using iTunes on Mac OS X, start the Terminal application from Applications/Utilities/Terminal. In the Terminal type and press enter: defaults write com.apple.iTunes carrier-testing -bool TRUE
When using iTunes on Windows, start a Console by going to Start/Run, typing cmd and pressing Enter. In the Console type and press enter: "C:\Program Files\iTunes\iTunes.exe" /setPrefInt carrier-testing 1
Start/Restart iTunes
Connect the iPhone to the computer by using the USB cable
In the left column, select the iPhone
When using Mac OS X, click on the "Restore" button while holding the alt/option button
When using Windows, click on the "Restore" button while holding the shift button
A file dialog will appear. Select the MobileVikings_be.ipcc file you downloaded in step 1.
iTunes will now start updating iPhone carrier settings and sync them with your iPhone.

This completes the setup process. You might have to reboot your iPhone, but all the options (such as tethering) and the Mobile Vikings logo should now be enabled and visible.

Thanks to @scorpiosoft for providing the modified carrier bundle, and @Undertaxxx25 for helping with figuring out the steps!

Tethering on your unlocked iPhone through iPhone OS 3.1.3

2010-02-09T18:35:00.001+01:00

When Apple released iPhone OS 3.1.2 on October 8 last year, it inadvertently disabled tethering on officially unlocked iPhones by requiring APN tethering settings to be signed in the iPhone Carrier Configuration (IPCCs) files. Until then network operators in countries where the iPhone was sold unlocked (like Mobile Vikings) would distribute custom generated IPCCs to their customers to enable things like internet, MMS and tethering. This of course would also allow people to design their own IPCCs to enable features that the network operator wouldn't want their customers to use, hence Apple introduced the extra signing.

With the release of iPhone OS 3.1.3 Apple seems to have listened to customer complaints by shipping IPCCs for the prior mentioned operators and therefore officially re-enabling tethering on the networks where this is allowed (hurray for BASE and Proximus and sorry for Mobistar customers).

If you are though running an iPhone with a custom IPCC, here are the steps to get the Apple IPCC for your network without loosing your applications and its settings. Keep in mind this only applies to officially unlocked phones that haven't been jailbroken and have been updated to iPhone OS 3.1.3.

Connect your iPhone using the USB cable and start iTunes
Your iPhone should now appear in the left column under "Devices"
Make sure that all songs purchased through the iPhone are transfered locally by right clicking on the iPhone and selecting "Transfer Purchases".
Create a backup of the iPhone and all its settings by right clicking on the iPhone and selecting "Back Up".
With the iPhone device selected in the left column, press the "Restore" button.
A warning message will now warn about loosing media and application settings (which we can restore later using the backup). Click "Restore" again.
iTunes will start unpacking the files, reboot the iPhone and start restoring the iPhone (which can take a little while).

Once the process is complete, iTunes will popup a message notifying that the restore has completed. The iPhone will reboot again.
iTunes will show the "Congratulations" screen. Press "Continue".
At this point restore iPhone settings from backup, and the iPhone will reboot one last time.
A sync later your iPhone should now have the latest Apple IPCC with tethering which you can enable under Settings/General/Network/Internet Tethering.

Getting started with iPhone, iPod Touch and iPad development

2010-01-29T18:01:00.003+01:00

With Apple's recent announcements more and more developers will be looking into writing their own native applications for the iPod Touch, iPhone and iPad. Getting started with a completely new platform and language tends to be a bit overwhelming, so here's some introductory information, links and guidance to help you get started.

Hardware requirements - Unfortunately Intel Mac OS X (Leopard of Snow Leopard) is currently the only development environment supported. This means no love for programmers working under Windows. Luckily Apple provides the Mac Mini as a relatively cheap way to get started, and the standard configuration should do just fine. An iPhone/iPad/iPod is also not required as the Simulator included with the iPhone SDK is a full featured, stable and reliable iPhone emulator. Keep in mind that when you do want to start testing on an actual iPhone, an iPhone Developer License (standard: $99/year) is necessary. This license allows beta deployment on 100 different iPhones, usage of the App Store (includes hosting of the application, credit card processing, feedback section, ....) and access to early beta's of the OS.

Software requirements - Apple provides the iPhone SDK for free to any person with an Apple ID and registered on Developer Connection. Registration is possible on that same page using the "register" link. The SDK includes the Xcode development environment (IDE: coding, debugging, source management), the iPhone Simulator, Interface Builder (for designing UIs), the GNU compiler, debugger, iPhone libraries and documentation.

Development requirements - In order to start writing for the iPhone OS, 3 areas of technical knowledge are needed:

Design Patterns (Model-view-controller, singleton, delegation and target-action)
C en Objective-C
iPhone platform

Design Patterns - All of these should already be familiar to you. Each pattern above is linked to its Wiki article in case you need to refresh your knowledge, but there are also plenty of resources on the web to help you out.

C and Objective-C - This is going to be one of the more difficult steps. First off one needs to be quite familiar with C/C++, and have an in depth knowledge of object oriented programming. This will help you get on the road with Objective-C easier. Tutorials that can help you are:

iPhone Platform - It's obvious this covers everything from learning how to use Xcode tools to actually absorb the different libraries provided with the SDK. A good way to start is the tutorial for writing your Your First iPhone Application. It covers the complete process of writing the code, designing the objects, linking it all together, compiling and running the result on the simulator. Apple's iTunesU also has a nice set of Getting Started Videos, and Stanford University made its iPhone Development lectures available online for free! Finally you can always fall back on, learn from and consult the iPhone Reference Library.

Happy coding!

2010 Recycling Calendar for downtown Leuven, Belgium

2010-01-29T14:29:00.004+01:00

The Recycling Calendar for downtown Leuven has been updated with the collection schedule for 2010. Instructions on how to integrate with your calendar application can be found by clicking here.

Mounting Linux (ext2/ext3) partitions under Mac OS X

2009-06-08T14:45:00.021+02:00

Ever tried accessing files under OS X from that external hard drive that used to be connected to your NAS or Linux box? Chances are you might have encountered one of these (Disk Insertion: The disk you inserted was not readable by this computer):

That's right, even though Mac OS X incorporates certain parts from FreeBSD's and NetBSD's implementation of Unix, it certainly doesn't have kernel support for the default file systems used by many popular Linux distributions. Luckily during Macworld 2007 Google introduced MacFUSE, a loadable kernel module for Mac OS X, that allows non-privileged users to create their own file systems without editing the kernel code. The project was based on FUSE a GPLed Linux module that provides a "bridge" to the kernel interfaces and allowing file system code to run in user space. Unfortunately neither projects supported the ext filesystem and it took until early 2008 before a guy named Alper Akcan finally introduced Fuse-ext2.

With those two software packages we can now easily access drives containing ext2 (and ext3) partitions. Here's how:

Download the latest MacFUSE binaries (MacFUSE-2.0.3,2.dmg) from the website at: http://macfuse.googlecode.com/.

Mount the MacFUSE-2.0.3,2.dmg volume and install the MacFUSE package by double clicking its icon (MacFUSE.pkg).

After the installation download the latest Fuse-ext2 binaries (fuse-ext2-0.0.5.dmg) from the website at: http://sourceforge.net/projects/fuse-ext2/.

Also mount the fuse-ext2-0.0.5.dmg volume and install the fuse-ext2 package by double clicking its icon (fuse-ext2.pkg).

Now that both packages are installed it's time to plug in our external drive containing the ext partition(s).

In order to mount any (or all) of them we need to find out what their device name is. This can most easily been done by launching Disk Utility from the Utilities folder under Applications. In the left column you should see your hard drive and the names of the partitions it contains.

In our case we would like to mount disk2s1 (highlighted in the screenshot above).

We need the Terminal application to do this, which is located under Applications.

After you launched Terminal.app we will create a new directory which will be the mount point for the partition on the drive. Once that's done we can use the fuse-ext2 command to actually mount the drive name mentioned above to the mount point.

mkdir /Volumes/myextdrive
fuse-ext2 /dev/disk2s1 /Volumes/myextdrive

Congratulations! Your external drive should now be visible in the Finder.

Google Street View car roaming Leuven, Belgium

2009-04-29T16:32:00.008+02:00

While getting on the freeway this noon, I noticed a strange looking vehicle with an Italian license plate in front of me sporting some type of roof-cam. It looks like Internet giant Google has started to roam the Leuven streets, snapping photos of city streets, buildings, landmarks, and just about anything else as part of the virtual online map called Street View. This comes about a month after their car was spotted traversing Brussels. Once Street View for Leuven becomes available on Google Maps I'll make sure to be on the lookout for "My Picture" ;-)

2009 Recycling Calendar for downtown Leuven, Belgium

2009-03-20T00:26:00.009+01:00

Last year I started publishing a public Google Calendar with the collection schedule for recyclables in in downtown Leuven. Today I am happy to announce that this calendar got updated with the items for 2009.

Since lots of people already use Google Calendar to stay organized and schedule their lives I figured it would be useful for all "Leuvenaars" to be able to add an updated recycling schedule to their existing list of calendars. In order to do so, simply press the button below and the "Ophaalkalender - Leuven Centrum" should appear under "My Calendars" in your Google Calendar!

Subscribing is not limited to Google Calendar alone. Starting with Outlook 2007 you can subscribe by following these steps, and this link:
http://www.google.com/calendar/ical/3llubcg90pdv62gmijvfann0tk@group.calendar.google.com/public/basic.ics

If you use Apple's iCal then these steps should work together with this link:
http://www.google.com/calendar/feeds/3llubcg90pdv62gmijvfann0tk@group.calendar.google.com/public/basic

Finally you can also check out the Recycling Calendar on the web by clicking this link.

Recycling Calendar for Leuven, Belgium

2008-04-22T23:12:00.009+02:00

Today April 22nd, millions of people around the world came together to celebrate Earth Day -- a commitment to taking care of our planet, and to fighting climate change.

One way to reduce energy usage and minimize air and water pollution is to recycle old materials into new products. Already since 1994 FOST Plus promotes, coordinates and finances selective collection, sorting and recycling of household waste in Belgium. One of their projects is to make each intermunicipal authority responsible for selective collection rounds in its municipality. Over here in downtown Leuven this is done by EcoWerf through a schedule released on their website.

Since lots of people already use Google Calendar to stay organized and schedule their lives I figured it would be useful for all "Leuvenaars" to be able to add an updated recycling schedule to their existing list of calendars. In order to do so, simply press the button below and the "Ophaalkalender - Leuven Centrum" should appear under "My Calendars"!

FileVault: recover unused disk space manually

2007-04-02T15:34:00.000+02:00

As mentioned in a previous post I always use FileVault as the default way to encrypt my user's home directory. Unfortunately this technique tends to eat up heaps of disk space when loading and deleting lot's of data. Apple solved this problem by trying to recover space when logging out or rebooting you machine as long as it's plugged into the wall.

This last bit about "being plugged into the wall" could be a tangible problem if you are nowhere near an outlet and really need the space. Here's a quick tutorial on how to manually recover that hard drive real estate:

While being logged in as the current user: click the Finder icon in the Dock.
From the Go menu, choose Utilities.
Open NetInfo Manager.

From the Security menu, choose Authenticate... and enter the password for the current user.
From the Security menu, choose Enable Root User and enter the password for the current user once again.
Press Command-Shift-Q and click Logout to confirm logging out your current user.
The logon menu will appear, and you select Other....
Enter as username root, and the password you've chosen for root.
Once logged in click the Finder icon in the Dock.
From the Go menu, choose Utilities.
Open Terminal.
Type "hdiutil compact /Users/tpennings/tpennings.sparseimage" (replace with the location of the sparseimage of the user account you're trying to compact) and press Return.

After this command completes it will tell you the amount of space reclaimed.
You can logout of the root account and re login as a normal user.

Digital Camera: continuous file numbering reset

2007-03-01T17:53:00.000+01:00

Nowadays many people own a digital camera. Specifically for point and shoot these new and rather cheap models are a great alternative to 35mm film cameras. I personally have two in my possession: a Canon Elph SD550 that is very small and easy to carry, and a Nikon D80 for more serious work. Both of these models take SD cards to store their pictures and once in a while they get mixed up where one ends up in the wrong camera. What is weird is that it seems to screw up the file naming mechanism. I always use continuous file numbering as it helps me to organize and backup pictures on a directory level before importing them into Google Picasa or Apple iPhoto.

But when I then put the SD card back into my Canon after using it on my Nikon file numbering seems reset and start with IMG_0001.JPG again. The exact reason for this is still unclear and so far I haven't been able to reproduce it on a consistent basis, but I assume one camera erases some logic the other camera might be using for keeping track of its file numbering. There is though a rather simple solution for this problem:

Slide your SD card in the camera.
Choose to format the card.
In the menu make sure to set File Numbering to Continuous.
Take a random picture.
Slide the SD card in a USB reader connected to your computer.
Find the picture in your file explorer and rename it similar to camera file naming logic with a number in sequence to your other pictures (e.g. IMG_2345.jpg).
Unmount your SD card.
Slide it out of the USB reader and back into your camera.
Take another picture.
Notice the new file naming (e.g. IMG_2346.jpg).

Keep in mind that so far this has only been tested on my Canon SD550. I assume it will work on other cameras as well.

FileVault - How to verify or repair a home directory image

2007-02-25T23:08:00.000+01:00

Last December I managed to break the LCD of my beloved PowerBook after successfully launching it from my open backpack. About 2 weeks later and with $850 vanished from my bank account I finally was able to log back into my OS X environment only to be confronted with Apple's equivalent of the Blue Screen of Death (aka Kernel Panic) after only a few minutes of browsing the web and trying to empty my Recycle Bin.

I immediately figured that the physical crash had damaged my hard drive so naturally I tried booting in Single User to manually run a filesystem check. This can be done by pressing Command-S when powering up the machine and typing /sbin/fsck -fy at the root prompt.


localhost:/ root# /sbin/fsck -fy
** /dev/rdisk0s3
** Root file system
** Checking HFS Plus volume.
** Checking Extents Overflow file.
** Checking Catalog file.
** Checking multi-linked files.
** Checking Catalog hierarchy.
** Checking Extended Attributes file.
** Checking Volume bitmap.
** Checking Volume information.
** The volume Macintosh HD appears to be OK.

Appears to be OK, that seems odd? I would at least have expected problems in the file system.
A bit confused I rebooted the machine to have a look at the the kernel panic log in /Library/Logs/panic.log and noticed the following entry.


panic(cpu 0 caller 0x00248DE0): hfs: block mark free: trying to free non-existent blocks (1694161930 587573128 24388658)

Latest stack backtrace for cpu 0:
Backtrace:
0x00095138 0x00095650 0x00026898 0x00248DE0 0x00248418 0x00247710 0x0022C068 0x0022C284
0x0023A9F4 0x0023A534 0x000FC4A0 0x000EDF70 0x002AAE28 0x000AB930 0x76EDF7FF
Proceeding back via exception chain:
Exception state (sv=0x2D5B5500)
PC=0x9001AECC; MSR=0x0200F030; DAR=0x00EE0883; DSISR=0x40000000; LR=0x2C038104; R1=0xBFFFF5A0; XCP=0x00000030 (0xC00 - System call)

Obviously the kernel must have panicked at the point I was trying to empty my Recycle Bin when it found out about non-existing blocks in the file system. Oddly enough the fsck earlier didn't turn up any issues with the file system. Then it occurred to me that the kernel was possibly pointing at errors in the FileVault file system for my user.

For quite some time now I've been using Apple's FileVault as the default way to encrypt my user's home directory. Not only is it more secure, it also allows for convenient and fast backups of one's user space. If you (like me) also make sure to place all your software in ~/Applications rather then /Applications then it should be rather easy to setup a brand new machine with your environment by just creating an identical username and copying over the users sparseimage which can be found in /Users/.username/username.sparseimage.

Still I had no idea on how to check FileVault file systems for errors. Luckily Apple's support website turned up this useful article which unfortunately didn't seem to work because other users or even administrators aren't allowed to write (and therefore fix) to another user's file system. When following their steps Disk Utility will show you the following.


Verify and Repair disk "tpennings"
Checking HFS Plus volume.
Checking Extends Overflow file.
Checking Catalog file.
Invalid extend entry
Incorrect block count for file compreg.dat
(It should be 0 instead of -1043562767)
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking Volume bitmap.
Checking Volume information.
Volume repair failed.

Error: The underlying task reported failure on exit

1 HFS volume checked
1 volume could not be repaired because of an error

After some trial and error and with testing I came up with the following (working) steps:

While being logged in as the current user: click the Finder icon in the Dock.
From the Go menu, choose Utilities.
Open NetInfo Manager.

From the Security menu, choose Authenticate... and enter the password for the current user.
From the Security menu, choose Enable Root User and enter the password for the current user once again.
Press Command-Shift-Q and click Logout to confirm logging out your current user.
The logon menu will appear, and you select Other....
Enter as username root, and the password you've chosen for root.
Once logged in click the Finder icon in the Dock.
From the Go menu, choose Utilities.
Open Disk Utility.
Click the Finder icon in the Dock.
From the Go menu, choose Go To Folder.
Type "/Users" and click Go.

Open the folder for the account you want to check. It should have the same name as the account's short name.
Find the ".sparseimage" file, and drag it into the left side of the Disk Utility window.

Select the disk image in Disk Utility.
Click the First Aid tab.
Click the Verify or Repair disk button, as desired.

This completes the tutorial on repairing your FileVault home directory or sparseimage.

Integrate "Digg This" button with Blogger

2007-02-23T23:39:00.000+01:00

Just recently I created this brand new Blogger account in order to see if it was customizable enough such that there would be no need to install and tweak WordPress using separate hosting to post some of my monthly ramblings.

One of my very first requirements was to be able to make it easy for visitors to "Digg" my stories for the world to see if they deemed them interesting enough. Luckily the guys at Digg created a very detailed article explaining how to integrate it's bright and shiny button including real-time Digg count into your personal HTML code.

Second I wanted to make sure every post included it's own Digg button as well as a permanent link to the individual article with seamless integration in the Blogger UI. This proved to be a bit more difficult and after unsuccessfully Googling for a bit I decided to take the task up on my own. Here's a short writeup of what I had to do. Keep in mind I was using the standard Minima Blue template provided by Blogger and even though I'll try to be as generic as possible your results may vary.

As most of you know Blogger bases the look of your personal blog completely on a template you pick and (potentially) later customize. As we will be editing this code it might be good to save a copy locally in case things go really wrong. You can do this by going to your Blogger dashboard and clicking the Layout link under the Blog you plan to alter.

And selecting Edit HTML.

Under the paragraph Backup/Restore Template you should see and option to Download Full Template.

After successfully storing the template XML to your local disk it's time to start tweaking the contents of your template in the Edit Template section. Make sure to Expand Widget Templates in order to see all the code in the edit box.

The actual insertion of Digg specific code will happen in two places: the first part is the CSS section which outlines the style of our button.


/* "Digg This" Button
----------------------------------------------- */
#digg-this-button {
 float: left;
 margin-right: 20px;
}

This part is actually rather straightforward and only describes where to place the actual image in relation to the blog text: left. On top we make sure there is a 20 pixel margin in between the written text and our button.
The second part sets the actual parameters for the button and links to the Digg JavaScript source that will eventually draw the button onto our blog.


<!-- Integrate "Digg This" Button -->
<div id='digg-this-button'>
 <script type='text/javascript'>
   digg_url = '<data:post.url/>';
   digg_bgcolor = document.body.bgColor;
   digg_skin = 'normal';
 </script>
 <script src='http://digg.com/api/diggthis.js' type='text/javascript'/>
</div>

This code is also not very hard to understand. Still there are two things I would like to point out.
First off there is the <data:post.url/> which is a Blogger specific layout data tag that gets replaced at runtime with the permanent URL of the current post. Blogger has a wide variety of such data tags, so if you like to experiment here is the master list.
Second there is the document.body.bgColor. This is a small piece of JavaScript code we use to detect the background color of the current blog. As the Digg button allows for defining a background color, making sure it matches it's template's background makes for a smoother looking end restult.

Now that we know which code to add we need to decide where to place it. The first part is rather simple: pretty much anywhere in the CSS section of the template. In my case I placed it at the bottom right above the start of the body code.

The second part is a little bit more difficult as it might differ between templates and its location is very important. The best way to go about it is finding the layout data tag that prints the actual post body and looks like <data:post.body/>. Just make sure to paste the button code right before the tag as you see below.

This rounds up the tutorial for integrating the "Digg This" button into your own Blog.The end result you can see on the top of this post.