If you’ve left information in the Address Book in OS X, any other program on the machine can use Cocoa APIs to extract information automatically.
#import <Foundation/Foundation.h> #import <AddressBook/AddressBook.h> #import <AppKit/NSWorkspace.h> void sayHello(void) { ABPerson *currUser = [[ABAddressBook sharedAddressBook] me]; NSString *firstName = [currUser valueForProperty:kABFirstNameProperty]; NSString *lastName = [currUser valueForProperty:kABLastNameProperty]; [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString: [NSString stringWithFormat: @"http://www.google.com/search?hl=en&q=%@+%@", firstName, lastName]]]; } int main (int argc, const char * argv[]) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; sayHello(); [pool release]; return 0; }
This will take the name labelled as the currently logged in user and hit up Google, placing the first and last name in the search box and run a search with it. Other pieces of information are also accessible via the AddressBook API.
As you can well see, this can be used for many purposes: nifty automagical hacks in the OS’s built-in suite of personal information and communcation apps, for example. But I can think of less beneficial uses for this API. You should be able to trust the programs you run.