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+1 A:

The Connection

An NSURLConnection object provides support to perform the loading of a URL request.
The Request

NSURLRequest objects represent a URL load request in a manner independent of protocol and URL scheme.

E.g. requestWithURL:

Creates and returns a URL request for a specified URL with default cache policy and timeout value.
```
+ (id)requestWithURL:(NSURL *)theURL
```
The URL

The NSURL class provides a way to manipulate URLs and the resources they reference. NSURL objects understand URLs as specified in RFCs 1808, 1738, and 2732. ...

To get the contents of a URL, NSString provides stringWithContentsOfURL: and NSData provides dataWithContentsOfURL:.

References:

The MYYN 2010-09-04 10:34:01

it means nsurlconnection is just to load a webpage, whole webpage will be display, nsurl is for getting data within the webpage?

Stefan 2010-09-04 11:01:01

No, read the links provided by The MYYN. NSURL is a model class that represents a URL. NSURLConnection is a class than ables you to download data from a URL. In order to use an NSURLConnection, you need to create a URL request using NSURLRequest, which uses NSURL to represent it's URL. Read the Cocoa documentation entitled Cocoa URL Loading System.

Jasarien 2010-09-04 11:05:17

for:NSString *myUrl = @"http://www.google.com";NSString *returnData = [NSString stringWithContentsOfURL:[NSURL URLWithString: myUrl]];orNSString *myUrl = @"http://www.google.com";NSURLRequest *myRequest = [ [NSURLRequest alloc] initWithURL: [NSURL URLWithString:myUrl] ];NSString *returnData = [ NSURLConnection sendSynchronousRequest:myRequest returningResponse: nil error: nil ];whats the difference?

Stefan 2010-09-04 12:40:57

I would be clearer if you editted your above comment with the code into the question, as it's almost unreadable in a comment. The answer however is that there is very little difference; the second method gives you more scope to handle errors. Both methods are syncronous; you should use asyncronous networking instead so your application does not lock up whilst fetching from the network.

JosephH 2010-09-04 12:59:53

my apologies. edited my post

Stefan 2010-09-04 13:08:14

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NSURLConnection or NSurl?

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