Print doc with iPhone application

I am a new iPhone Application developer. I want to create an application which will print a document or string by a button tap.After tapping the开发者_JAVA技巧 button search the printer which is in network path.iPhone device and printer will be connected with wireless LAN. I read the Apple guideline to create such type of application, but I am so new a developer that I don't understand all of this.

Thanks in advance.

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You might find this tutorial http://bynomial.com/blog/?p=115 helpful.