iOS/iPhone NSURLConnection (Objective-C)

    NSURLRequest *theRequest =
    [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.thaicreate.com/url/string.php"]
                     cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                 timeoutInterval:10.0];

    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

// เมื่อเริ่มทำงาน
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    receivedData = [[NSMutableData alloc] init];
}

// เมื่อเริ่มรับค่าที่ Server ทำการ Response กลับมา
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [receivedData appendData:data];
}

// เมื่อการทำงานผิดพลาด
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{	
    NSLog(@"Connection failed! Error - %@", [error localizedDescription]);   
}

// เมื่อการทำงานเสร็จสิ้น
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    if(receivedData)
    {
    //
    }
}

<?php
echo "This string from server!";
?>

//
//  ViewController.h
//  NSURLConnectionApp
//
//  Created by Weerachai on 12/8/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    IBOutlet UILabel *lblString;
}

@property(nonatomic,assign) NSMutableData *receivedData;

@end

//
//  ViewController.m
//  NSURLConnectionApp
//
//  Created by Weerachai on 12/8/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize receivedData;


- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    
    NSURLRequest *theRequest =
    [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.thaicreate.com/url/string.php"]
                     cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                 timeoutInterval:10.0];

    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    
    if (theConnection) {
        self.receivedData = nil;
    } else {
		UIAlertView *connectFailMessage = [[UIAlertView alloc] initWithTitle:@"NSURLConnection " message:@"Failed in viewDidLoad"  delegate: self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
		[connectFailMessage show];
		[connectFailMessage release];
    }
    
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    receivedData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    
    [connection release];
    [receivedData release];
    
    // inform the user
    UIAlertView *didFailWithErrorMessage = [[UIAlertView alloc] initWithTitle: @"NSURLConnection " message: @"didFailWithError"  delegate: self cancelButtonTitle: @"Ok" otherButtonTitles: nil];
    [didFailWithErrorMessage show];
    [didFailWithErrorMessage release];
	
    //inform the user
    NSLog(@"Connection failed! Error - %@", [error localizedDescription]);
    
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    if(receivedData)
    {
        NSLog(@"%@",receivedData);
        NSString *dataString = [[NSString alloc] initWithData:receivedData encoding:NSASCIIStringEncoding];
        
        [lblString setText:dataString];
        
        NSLog(@"%@",dataString);
    }
    
                                                 
    // release the connection, and the data object
    [connection release];
    [receivedData release];
}
                                        
                                                 
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)dealloc {
    [lblString release];
    [super dealloc];
}
@end