How to grab email contacts? [duplicate]

This question already has answers here: 开发者_高级运维 Closed 11 years ago.

Possible Duplicate:

Gmail Contact api

How can i get (grab) email contacts by supplying Username and Password?

From Gmail, for example.

Please suggest or point me real working one.

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Look at the OpenInviter http://openinviter.com/ , I believe you can get the full contact list from most popular social/email services. This would get you going on how to get started, as its open source and you can go through the code to see how it works.