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StackOverflow2013
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    <p>Each NSURLDownload represents a single downloading instance. You're probably trying to reuse the same one multiple times. It's an inherently asynchronous system that already used background threads. Here's an example based on Apple's sample code:</p> <pre><code> - (void)startDownloadingURL:sender { // Create a couple requests. NSURLRequest *requestOne = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; NSURLRequest *requestTwo = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://stackoverflow.com"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; // Create two download instances NSURLDownload *downloadOne = [[NSURLDownload alloc] initWithRequest:requestOne delegate:self]; NSURLDownload *downloadTwo = [[NSURLDownload alloc] initWithRequest:requestTwo delegate:self]; if (downloadOne) { // Set the destination file. [downloadOne setDestination:@"/tmp" allowOverwrite:YES]; } else { // inform the user that the download failed. } if (downloadTwo) { // Set the destination file. [downloadTwo setDestination:@"/tmp" allowOverwrite:YES]; } else { // inform the user that the download failed. } } - (void)download:(NSURLDownload *)download didFailWithError:(NSError *)error { // Release the connection. [download release]; // Inform the user. NSLog(@"Download failed! Error - %@ %@", [error localizedDescription], [[error userInfo] objectForKey:NSErrorFailingURLStringErrorKey]); } - (void)downloadDidFinish:(NSURLDownload *)download { NSLog(@"The download %@ has finished.", download) // Release the download connection. [download release]; } </code></pre> <p>If you attempt to use the same NSURLDownload for both NSURLRequests, then it will kill the previous connection.</p>
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    1. COhi, is there a way I make `downloadDidFinish` only be called if the two downloads are finished? Thanks!
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    2. COwhat happens if I place the `downloadTwo` in `downloadDidFinish`? Can I do this and add another `downloadDidFinish` to ensure bought files will be downloaded before my program continues executing code? But in that way isn't there a risk of the second download call the first `downloadDidFinish`and run into a infinite download loop? :S Sorry new to Obj-C. QT kinda makes this easier... :S
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