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NSURLConnection failing
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NSURLConnection failing


  • Subject: NSURLConnection failing
  • From: "Doug Penny" <email@hidden>
  • Date: Thu, 21 Feb 2008 21:23:08 -0500

I am trying to use NSURLConnection to fetch a few small images (like
10k) from various websites.  The connections are established and then
the connection:willSendRequest:redirectResponse: delegate method is
called and it freezes.  It never times out that I know of, at least
the connection:didFailWithError: delegate is never called.  So now for
the crazy part... sometimes the code works fine and all of the images
are retrieved.  I have tested this with several different sites and it
seems to be fairly random.  I have tried different caching policies as
well with no change.  If it fails, it always seems to fail after the
redirect is received.  I am running this on Leopard with GC enabled.
Below is the code I am using, I removed all the log messages I was
using for debugging.  If anyone has any ideas they would be greatly
appreciated.


NSURLRequest *request=[NSURLRequest requestWithURL:[NSURL
URLWithString:imageURL]

cachePolicy:NSURLRequestReloadIgnoringLocalCacheData

timeoutInterval:30.0];

NSURLConnection *imageConnection = [[NSURLConnection alloc]
initWithRequest:request

                                     delegate:self];

if (!imageConnection) {
    NSLog(@"A problem was encountered while trying to download an
image from %@", imageURL);
}


----------------delegate methods-----------------

- (void)connection:(NSURLConnection *)connection
didReceiveResponse:(NSURLResponse *)response
{
    [receivedData setLength:0];
}

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

- (NSURLRequest *)connection:(NSURLConnection *)connection
                     willSendRequest:(NSURLRequest *)request
                    redirectResponse:(NSURLResponse *)redirectResponse
{
    return request;
}

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

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    image = [[NSImage alloc] initWithData:receivedData];
    if (!image || ![image isValid]) {
        image = [NSImage imageNamed:@"missingImage.tiff"];
    }
}



-Doug
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