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    <p>I handled multiple NSUrlConnections using a NSMutableDictionary which keeps track of which instance of NSMutableData a particular NSURLConnection should save its result to.</p> <p>At the beginning of my class I define:</p> <pre><code>NSMutableDictionary *dataDictionary; </code></pre> <p>Then in my loadData method, I have:</p> <pre><code> // Create the request NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:currentCam] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:30]; // create the connection with the request // and start loading the data NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if (theConnection) { NSMutableData *receivedData = receivedData = [[NSMutableData alloc] init]; //keep track of this connection by adding it to subViewDictionary and dataDictionary with appropriate objects. [dataDictionary setObject:receivedData forKey:[theConnection description]]; } else { NSLog(@"ERROR DOWNLOADING WITH NSURLCONNECTION"); } [theConnection release]; </code></pre> <p>I use [theConnection description] as my key and an instance of MSMutableData as the object in my dictionary, so later I can look up which instance goes with a particular connection. If you fail to do this you can have issues with data corruption (multiple connections can all save their data to the same variable).</p> <p>Then, I define the following NSURlConnection delegate methods:</p> <pre><code>- (void)connection:(NSURLConnection *)connection didReceiveData:(NSMutableData *)data { //look up in dictionary to find out which recievedData instance to use. NSMutableData *theReceivedData = [dataDictionary objectForKey:[connection description]]; // Append the new data to receivedData. [theReceivedData appendData:data]; } - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { //Lookup in the dictionary to find the correct instance of recievedData to put image into. NSMutableData *theReceivedData = [dataDictionary objectForKey:[connection description]]; [theReceivedData setLength:0]; [activityIndicator stopAnimating]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { // inform the user that there was an error NSLog(@"Connection failed! Error - localizedDescription:%@ NSURLErrorFailingURLStringErrorKey:%@", [error localizedDescription], [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]); NSMutableData *theReceivedData = [dataDictionary objectForKey:[connection description]]; [theReceivedData release]; //remove keys for this connection since it did not load. [dataDictionary removeObjectForKey:[connection description]]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { //look up correct instance of recievedData in teh dictionary for this connection NSMutableData *theReceivedData = [dataDictionary objectForKey:[connection description]]; NSLog(@"Succeeded! Received %d bytes of data",[theReceivedData length]); //---do stuff with data here// [theReceivedData release]; } </code></pre> <p>There is a good tutorial on NSURlConnection <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/URLLoadingSystem/Tasks/UsingNSURLConnection.html" rel="nofollow">here</a> for a single connection. My code is based on that with the addition of the NSMutableDictionary to keep track of each NSUrlConnection and each NSMutableData instance. </p> <p>I hope that makes sense and is helpful!</p>
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    1. COJackson, Thanks for your response. I will try with this now in my app.
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    2. COYou're welcome. I hope I could help.
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