In order to write Tiled’s TMX file format I needed to do exactly this: figure out how to compress data, encode it as a string, and write it to XML.

I wrote down what I learned from using zlib, base64 and xswi – XML Stream writer for iOS (a single Objective-C class) while writing KoboldTouch‘s TMX writer.

I split it into two articles in the Essential Cocos2D section of the www.KoboldTouch.com homepage:

I was positively surprised how relatively painless zlib and base64 encoding worked (I expected the worst!) and how simple and effective xswi is for writing XML compared to any other XML library.

I’ll probably continue to add those articles to Essential Cocos2D rather than posting them on this blog. Confluence is just so much more convenient for writing technical documentation than WordPress.

Final word: Enjoy! :)

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Issues with Images & PDF downloads

On May 10, 2010, in Announcements, by Steffen Itterheim

I keep getting reports from users who either don’t see images on some lessons of the Tutorial and FAQs or who can’t download the Manual/Lesson PDF files.

The broken images usually fix themselves if you hit the reload button in your browser. You may have to wait a few minutes though. I’m still looking into what’s causing this. For the time being i have disabled the WordPress QuickCache plugin as i suspect it may have something to do with it.

If you can not download the PDF files and instead you get an error message which is formatted in XML like this:

This is because the links to the PDF files expire some time after you have loaded the webpage. A PDF link normally looks something like this:

Amazon’s S3 service will expire such a link after some time. Please do not share direct download links to the manual/lesson PDF files since they will expire, instead link to the lesson itself. If you have problems downloading the PDF, please reload the page and try downloading the PDF again.

I’m sorry about the inconveniences this is causing some of you.

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