iPhone iOS4 - how to work with address book and calendar?

I need to know how I can access my calendar and contacts from my iPhone from my own App? Is it possible?

I need 开发者_JAVA百科it because I created a stats App and need to know how many contacts and calenders posts the phone has.

The extent to which you can integrate with other system data is all quite complete in the documentation, and not difficult to find. The bit you're looking for is here:

http://developer.apple.com/iphone/library/documentation/iphone/conceptual/iphoneosprogrammingguide/CoreApplication/CoreApplication.html#//apple_ref/doc/uid/TP40007072-CH3-SW39

For the address book, see: http://developer.apple.com/iphone/library/documentation/ContactData/Conceptual/AddressBookProgrammingGuideforiPhone/100-Introduction/Introduction.html

I don't know about accessing calendar, though.