Iphone web service get response

In my Iphone app ,how to read the purchaseUrl and purch开发者_如何学运维aseUrl2 and on button click download them to my computer or iphone :

JSON-message output: { “PurchaseUrl” : 480p URL “PurchaseUrl2” : 720p URL }

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1. That's not valid JSON
2. See Apple's downloading guide using NSURLConnection.
3. Use the JSON framework for iphone. - See this tutorial.
4. This is a duplicate of so many questions... please google before you ask.