How to use google place api in iphone to query supermarkets around my place

I am new in Google places API and don't know how to use in our application...Can any one explain me how to get the list of Supermarkets around my places..

Currently I am using this link but not able to get that things which I want.

Please help me to solve the problem...

The URL should be:

https://maps.googleapis.com/maps/api/place/search/json?location=lat,long&radius=500&types=grocery_or_supermarket&sensor=false&key=yourkey