How to use base64 classes?

I 开发者_StackOverflow中文版want get the image from an xml file which is encoded using base64.

I want to decode that data into image, but i don't know how to do that.

So please give me some instructions to find that...

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There's a nice code sample at the bottom of this post. Very self-contained...

http://www.cocoadev.com/index.pl?BaseSixtyFour

for more read SO post