Hi vishal, from your Iphone app send a GET request to the Google Base
URL and it returns an XML with all data, then parse it and then use
what you need.
For example: 
http://base.google.com/base/feeds/snippets/?bq=[upc(text):"885909174966"]
You can control and sort the results adding: &max-results=1&start-
index=1&orderby=relevancy to the URL string
Ex:  
http://base.google.com/base/feeds/snippets/?bq=[upc(text):"885909174966"]&max-results=1&start-index=1&orderby=relevancy

There are many options for control the results. Just take a look to
the docs :)

I hope this help's you

Greetings!

On 3 mayo, 15:04, vishal singh <[email protected]> wrote:
> hi, i am vishal,i-phone application developer new to google base api.
> I want to use google base for searching product by barcode.The
> information want to retrieve like-product name,price,image in xml
> format.
> How can i achieve this? please help me by providing necessary steps.
>
> Thanking you.
> Vishal singh
>
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