How to send a HTTP request from Cocoa Application

         //prepar request 	NSString *urlString = [NSString stringWithFormat:@"http://urlToSend.com"]; 	NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; 	[request setURL:[NSURL URLWithString:urlString]]; 	[request setHTTPMethod:@"POST"];         //set headers 	NSString *contentType = [NSString stringWithFormat:@"text/xml"]; 	[request addValue:contentType forHTTPHeaderField: @"Content-Type"]; 	//create the body 	NSMutableData *postBody = [NSMutableData data]; 	[postBody appendData:[[NSString stringWithFormat:@"<xml>"] dataUsingEncoding:NSUTF8StringEncoding]]; 	[postBody appendData:[[NSString stringWithFormat:@"<yourcode/>"] dataUsingEncoding:NSUTF8StringEncoding]]; 	[postBody appendData:[[NSString stringWithFormat:@"</xml>"] dataUsingEncoding:NSUTF8StringEncoding]];         //post 	[request setHTTPBody:postBody]; 	//get response 	NSHTTPURLResponse* urlResponse = nil; 	NSError *error = [[NSError alloc] init]; 	NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error]; 	NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; 	NSLog(@"Response Code: %d", [urlResponse statusCode]); 	if ([urlResponse statusCode] >= 200 && [urlResponse statusCode] < 300) { 		NSLog(@"Response: %@", result);                 //here you get the response 	} 

How to get data from info.plist file in Iphone app development :

 NSString * stringFromInfoPlist = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"stringInInfoPlist"]; 

Update : More info on *.plist files management here : iPhone Development Blog

via Thomas Nicholls

Here is a simple to way to access to Iphone address book for Cocoa Iphone developers :

 // open the default address book. ABAddressBookRef m_addressbook = ABAddressBookCreate(); if (!m_addressbook) {     NSLog(@"opening address book"); } //get people and index CFArrayRef allPeople = ABAddressBookCopyArrayOfAllPeople(m_addressbook); CFIndex nPeople = ABAddressBookGetPersonCount(m_addressbook); //iterate on each person for (int i=0;i < nPeople;i++) {     ABRecordRef ref = CFArrayGetValueAtIndex(allPeople,i);     //get phone numbers and names     ABMultiValueRef phoneNumberProperty = ABRecordCopyValue(ref, kABPersonPhoneProperty);     NSArray* phoneNumbers = (NSArray*)ABMultiValueCopyArrayOfAllValues(phoneNumberProperty);     NSString* name = (NSString*)ABRecordCopyValue(ref, kABPersonFirstNameProperty);     CFRelease(phoneNumberProperty);     //Loop to display results     NSLog(@"Name = %@", name);     NSLog(@"Phone numbers = ");     for (int j=0; j<[phoneNumbers count]; j++) {         NSLog(@" phone -> %@", [phoneNumbers objectAtIndex:j]);     }     //release memory     [phoneNumbers release]; }