How to integrate QR Code Reader in iphone apps - iphone

I am new in iphone development and we have to integrate the QR code reader in my apps, i have no idea about that some one please guide me how can i start. Give me some sample code or any tutorials links for that. Any help is highly appreciated.

There is a great library to do such project. Take a look at zxing. There is an obj-c version.

try out zbarSDK! it worked well for me, http://zbar.sourceforge.net/iphone/sdkdoc/

Here is the zxing (zebra crossing) google library. It can get you started. Hope that helps!

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Implement Panorama feature in iPhone

I have to implement the Panorama feature in my ios app. Is there any library or source code for this?
I know there are many questions on this but can't able get much idea about this.
Help me if any one knows.
Please have a look at PanoramaGL . It perfectly works on iPhone,iPad,iPod and Android.

QR code reader for iPhone. Z-Xing is too big

Is there a current iPhone QR library? Zebra Xing is pretty huge for the small app that I plan to make. ZBar has the wrong kind of license. Any suggestions would be well appreciated. All it has to do is recognize a QR code and interpret it, hopefully at a high frame rate. Thanks in advance.
You can also try shop savvy iphone sdk for read qr code : http://shopsavvy.mobi/sdk/
Zbar is the best. Easy to integrate and good documentation is there. See their site http://zbar.sourceforge.net/. And see their tutorial http://zbar.sourceforge.net/iphone/sdkdoc/tutorial.html.
Thanks
you can do using this :
ZBar = SDK
and
use this step which gives by this answer
Zbar SDK is not working in iOS6
other source =
See this Link
This one looks good, we are using it: Esponce QR Reader - it is fast, nice looking, easy to use and it recognize all fields from contact cards correctly, also unicode chars.

Three20 Thumbnail tutorial for Xcode 4.2?

I am new to iOS development and was trying to learn to use Three20's Thumbnail feature.
Can someone point me to a tutorial or give me an example of basic use?
I'm using Xcode 4.2,Storyboard, and ARC.
I've tried the tutorial from Ray Wenderlich(http://www.raywenderlich.com/1430/how-to-use-the-three20-photo-viewer),
but it doesn't work for me and his source-code throws a ton of errors.
Thanks!
-Shredder2794
I never used Three20, but Jeff Verkoeyens Nimbus framework ist pretty awesome and the documentation is much much better, which is (in my view) essential for people just starting out with iOS development :)
Take a look at his github repo there is a sample application implementing the Nimbus Photo Module or the docs ("Modules" > "Nimbus Photos").

how can i create Cover Flow application in iphone programming

hey all,
Anyone guide me that how can i create cover Flow application for an iphone. i am trying to cover some area but i can't understand about it. so please help me to solve my problem. Thanks in advance for the help.
Get the first edition of Erica Sadun's 'iPhone Developer Cookbook' - it has an example there.

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Has anyone found a solution to decompressing RAR files on iPhone (not Jailbroken)? It would be great if there was a library similar to libz.
I did not find anything official from RARlab.
Anyone successful with integrating unRAR into their app? The
source code appears to be C++?
I know that this has been asked before, but I've not seen a solution other than porting unRAR which is beyond me. Would greatly appreciate any information or suggestions. Thank you.
If you want to use the unRAR in an iOS app, you'll probably need to find someone experience with C++ to integrate it into your project.