Re: NSURLConnection failing [SOLVED]
Re: NSURLConnection failing [SOLVED]
- Subject: Re: NSURLConnection failing [SOLVED]
- From: "Doug Penny" <email@hidden>
- Date: Mon, 25 Feb 2008 11:18:18 -0500
On Thu, Feb 21, 2008 at 9:23 PM, Doug Penny <email@hidden> wrote:
> 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
>
Turns out garbage collection was doing me in. When the
NSURLConnection object was hanging out waiting for a response, it
would get collected. To work around this, after creating the
NSURLConnection object I just stick it in a NSMutableSet. When the
delegate gets the -connectionDidFinishLoading: message I remove the
connection object from the set. Works great now.
Doug
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