iphone-sdk-3.0

I have had zero success with in app purchase. I have submitted the free app binary, and then rejected the binary. I have added the test product. I have approved the test product TAP001. I have followed the code examples to no avail. I do a SKProducts request using both "com.companyname.appid.TAP001" and just "TAP001" Regardless, I get an empty response.products and response.invalidProductIdentifiers with the product string I sent. I created a test user, but seeing how I cannot get any product info, the test user doesn't really come into play yet. Can in app purchase be tested in debug or

I have an app which crashes occasionally due to the array returned by ABAddressBookCopyArrayOfAllPeopleInSourceWithSortOrdering() having a different size to ABAddressBookGetPersonCount(). The shell of the code is shown below. Usually nPeople is the same size as the array. However, on one user's iPhone (or at least, as reported by one user), nPeople is almost twice as large. I can stop the crash by using the array size, rather than ABAddressBookGetPersonCount(). However, I am not sure if this means I am not accessing all of the Contacts in the iPhone. Has anyone come across this issue before?

I am facing a very regular scenario. I have an NSArray which has object of a custom type, say Person. The Person class has the attributes: firstName, lastName and age. How can I get an NSArray containing only one attribute from the NSArray having Person objects? Something like: NSArray *people; NSArray *firstNames = [people getArrayOfAttribute:@"firstName" andType:Person.Class] I have a solution of writing a for loop and fill in the firstNames array but I don't want to do that. NSArray will handle this for you using KVC NSArray *people ...; NSArray *firstName = [people valueForKey:@"firstName"