objective-c EXC_BAD_ACCESS in my code...

Question

I'm new to objective-c and Im trying to write a little sample app that gets some XML from a remote server and outputs it to the console, but when I do it I get a EXC_BAD_ACCESS which I dont understand:

    NSString *FeedURL = @"MYURLGOESHERE";
    NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:FeedURL]];
    NSURLResponse *resp = nil;
    NSError *err = nil;
    NSData *response = [NSURLConnection sendSynchronousRequest: theRequest returningResponse: &resp error: &err];
    NSString *theString = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding]; 

    NSLog(@"Response: %@", theString);];

    [resp release];
    [err release];

When I comment out the [resp release] line I dont get it anymore, can someone please explain this to me :)

Thanks

Answer 1

NSData *response = [NSURLConnection sendSynchronousRequest:…];

This is not an alloc/create/copy method so you should not release response.

NSString *theString = [[NSString alloc] initWithData:…];

But you should release theString.

Answer 2

You are releasing an object that you don't own; since "sendSynchronousRequest" contains neither the word "alloc" nor the word "copy" in its name, you know that any object it gives you will automatically be deallocated with "autorelease", and so what you have is, in effect, a double-delete.