Re: runloops and NSURLConnection

FROM : Michael Vannorsdel
DATE : Sat May 31 16:09:36 2008

I think you want to schedule the connection for the 
NSModalPanelRunLoopMode runloop mode.  This is the mode that is used 
for modal windows.


On May 31, 2008, at 7:28 AM, Torsten Curdt wrote:

> A bit puzzled ...seems like I need some advise here.
>
> From a NSWindowController I create a modal dialog
>
>  [NSApp runModalForWindow:[self window]];
>
> On a button click I am trying to use NSURLConnection to do retrieve 
> information in a asynchronous fashion
>
>  connection = [[NSURLConnection alloc] initWithRequest:request 
> delegate:self];
>
> Unfortunately this only works when I afterwards enter this runloop
>
>    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
>    while(!terminated) {
>        if (![[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode 
> beforeDate:[NSDate dateWithTimeIntervalSinceNow:100000]]) {
>            break;
>        }
>        [pool release];
>        pool = [[NSAutoreleasePool alloc] init];
>    }
>    [pool release];
>
> (the connectionDidFinishLoading:/connection:didFailWithError: 
> terminates the above loop)
>
> Now I am a bit surprised. Shouldn't runModalForWindow: do pretty 
> much the same thing? The documentation states
>
> "By default, for the connection to work correctly the calling 
> thread’s run loop must be operating in the default run loop mode. 
> See scheduleInRunLoop:forMode: to change the runloop and mode."
>
> But I am a bit lost what to do with that information. I would assume 
> that
>
> scheduleInRunLoop:[NSRunLoop currentRunLoop] 
> forMode:NSDefaultRunLoopMode
>
> is the default anyway. Nevertheless I am targeting 10.4 and this is 
> only available since 10.5.
>
> I found this response from Fraser
>
> http://lists.apple.com/archives/aperture-dev/2008/Feb/msg00036.html
>
> ...but I would like to understand the "why". Do I really have to 
> spawn another thread for this? Or is it OK to process the run loop 
> like shown above? I have the feeling I am somehow fighting the 
> framework again here.
>
> Comments?
>
> cheers
> --
> Torsten_______________________________________________
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