iOS : Can't get the user email address

I want to get the user mail address, as shown in this thread : Getting user's default email address in Cocoa

But when I tried :

NSString *theEmailAddressWeWantToObtain = @"";
ABPerson *aPerson = [[ABAddressBook sharedAddressBook] me];
ABMultiValue *emails = [aPerson valueForProperty:kABEmailProperty];
if([emails count] > 0)
        theEmailAddressWeWantToObtain = [emails valueAtIndex:0];

I have these errors :

Use of undeclared identifier 'aPerson'
Use of undeclared identifier 'ABAddressBook'
Unknown type 'ABMultiValue'

I've linked AddressBook and AddressBookUI, and imported AddressBook/AddressBook.h

What's wrong ?

Solution

These are the corrections to your code

NSString *theEmailAddressWeWantToObtain = @"";
ABPerson *aPerson = [[ABAddressBook sharedAddressBook] me];
ABMultiValueRef *emails = [aPerson valueForProperty:kABEmailProperty]; //No such thing as ABMultiValue; it's ABMultiValueRef
if(ABMultiValueGetCount(emails) > 0) //"emails" is not an array, so you can't use the "count" method
    theEmailAddressWeWantToObtain = [emails valueAtIndex:0];

I'm not so familiar with Key Value Coding, so I'm not sure about your methods related to that.

This is the way I would do it

There are three email address stored in the email ABMultiValueRef: home, work, and other emails. Try this code to get the home email:

NSString *email;

ABRecordRef currentPerson = (__bridge ABRecordRef)[[PSAddressBook arrayOfContacts] objectAtIndex:identifier];
ABMultiValueRef emailsMultiValueRef = ABRecordCopyValue(currentPerson, kABPersonEmailProperty);

NSUInteger emailsCount;    
//Goes through the emails to check which one is the home email
for(emailsCount = 0; emailsCount <= ABMultiValueGetCount(emailsMultiValueRef);emailsCount++){ 
    NSString *emailLabel = (__bridge_transfer NSString *)ABMultiValueCopyLabelAtIndex (emailsMultiValueRef, emailsCount);

    if([emailLabel isEqualToString:@"Home"]){

        if ((__bridge_transfer NSString *)ABMultiValueCopyValueAtIndex(emailsMultiValueRef, emailsCount) != NULL){

            email = (__bridge_transfer NSString *)ABRecordCopyValue(currentPerson, kABPersonEmailProperty);
        }   

        //If the last name property does not exist
        else{

            email = @"NULL";
        }
    }
}

CFRelease(emailsMultiValueRef);

If you have any questions about the code, just ask in the comments. Hope this helps!

EDIT:

The PSAddressBook class mentioned in the code can be found here: https://github.com/pasawaya/PSAddressBook