Question

From my ApplicationDelegate, I’m doing an NSURLConnection fetch over the network (it’s wrapped in a class, as you’ll see below). This one seems to work correctly: I get all the data in didReceiveData and I get the completion call connectionDidFinishLoading. At the end of connectionDidFinishLoading, I instantiate one or more of a slightly different kind of wrapper class, but they’re essentially the same thing. The problem is that the second NSURLConnection’s delegate is never having it’s methods called.

I’ve looked at many different answers, but all to no avail. I’m not spawning any new threads and all the [NSThread isMainThread] checks I’ve littered throughout the code return true.

I’m stumped. Can anyone help me out? Here’s the relevant code:

App Delegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    ConnectionWrapper* w = [[ConnectionWrapper alloc] initWithParams:self
    url:[NSURL URLWithString:<url>]];
[w beginFetch];

    return YES;
}

...

-(void)fetchCompleted:(NSURL*)url directory:(NSString*)directory
{
NSLog(@"fetch completed");
}

-(void)fetchFailed:(NSURL*)url
{
NSLog(@"fetch failed");
}

...

ConnectionWrapper:

-(id)initWithParams:(id<ConnectionWrapperDelegate>)d url:(NSURL*)url
{
    delegate = d;

    connURL = url;

    return [self init];
}

-(void)beginFetch
{
    NSURLRequest* request = [[NSURLRequest alloc] initWithURL:connURL];
    NSURLConnection* conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    [conn release];
    [request release];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    NSLog(@"append");
    [responseData appendData:data];
}

- (void) connectionDidFinishLoading: (NSURLConnection*) connection
{
    ... parsing ....

    DifferentConnectionWrapper* w = [[DifferentConnectionWrapper alloc] initWithParams:self
        url:[NSURL URLWithString:<different url>]];
    [w beginFetch];
}

-(void)fetchCompleted:(NSURL*)URL
{
    NSLog(@"completed: %@", URL);
}

-(void)fetchFailed:(NSURL*)URL
{
    NSLog(@"failed");
}

DifferentConnectionWrapper:

-(id)initWithParams:(id)d url:(NSURL*)url
{
delegate = d;

    connURL = url;

    return [self init];
}

-(void)beginFetch
{
    NSURLRequest* request = [[NSURLRequest alloc] initWithURL:connURL];
    NSURLConnection* conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    [conn release];
    [request release];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    NSLog(@"append");
    [responseData appendData:data];
}

- (void) connectionDidFinishLoading: (NSURLConnection*) connection
{
    ... parsing ....

    DifferentConnectionWrapper* w = [[DifferentConnectionWrapper alloc] initWithParams:self
        url:[NSURL URLWithString:<different url>]];
    [w beginFetch];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"got response");
    [responseData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    NSLog(@"got data");
    [responseData appendData:data];
}

- (void) connectionDidFinishLoading: (NSURLConnection*) connection
{
    NSLog(@"image saver completed: %@", connURL);
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"error");
}

ConnectionWrapper and DifferentConnectionWrapper have similar functions, but there’s other logic that I’ve omitted here for brevity.

thanks for the help. I appreciate it.

Answer 1

OK. It turns out that this bug was caused by something I missed. I was going into a hard spin right after that second request, which would probably screw up just about anything. Once I fixed that problem, everything worked just fine.

Thanks for the help.