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POiPhone: Downloading data asynchronously with NSURL request as opposed to [NSData datawithContents ofURL]
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copied!<p>Hi Im a newbie and Im trying to download geocoding data from googleapi webpage. I did it using this: code:</p> <pre><code> NSMutableString *urlStr = [[NSMutableString alloc] initWithString:temp]; NSMutableString *address = [[NSMutableString alloc] initWithString:l.Address]; [address appendString:@" "]; [address appendString:l.CityName]; [address appendString:@" "]; [address appendString:l.State]; [address appendString:@" "]; [address appendString:l.PostalCode]; NSArray *addressArray = [address componentsSeparatedByString:@" "]; [address release]; NSString *a = [addressArray componentsJoinedByString:@"+"]; [urlStr appendString:a]; [urlStr appendString:@"&sensor=false"]; NSURL *url = [[NSURL alloc] initWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; NSData *data = [NSData dataWithContentsOfURL:url]; </code></pre> <p>It worked fine but the glitch was that it locked up my GUI since it was all done synchronously.</p> <p>Someone suggested I do it asynchronously using NSURLrequest. So I went to the apple website. from there I saw their example. However, Im still stuck. How do I convert the above code which is a synchronous request to an asynchronous one? So far this is what I have, but Im not sure if this works...... a bit confused ... could someone please point me in the righ direction with this code?</p> <pre><code> NSURL *url = [[NSURL alloc] initWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; //create NSURL request for asynchronous processing NSURLRequest *theRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; NSURLConnection *theConnection= [[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if (theConnection) { receivedData = [[NSMutableData data] retain]; } else { // Inform the user that the connection failed. } </code></pre>

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