Objective C - NSOutputStream events arriving with delay

Question

I'm scheduling stream objects on run loops, and the server retrieves the correct information etc, however after dispatching requests to write to the NSOutputStream I am receiving events a lot later than expected, screwing up control flow. I handle events using the following method from the NSStreamDelegate protocol :

- (void)stream:(NSStream*)theStream handleEvent:(NSStreamEvent)streamEvent

I am calling the query as follows, and the events aren't received until the loops have been exit :

for (NSMutableArray* objs in allObjs) {

    for (Obj* o in objs) {

        [self searchQuery:[NSString stringWithFormat:@"%@ foo", o.bar]];
    }
}

I tried creating a global variable that flags whether the most recent dispatched event has been processed, this is looped over before iterating again in the inner for loop, but runs indefinitely.

How should I correctly wait for each result from the queries before iterating again in the inner for loop?

Thanks in advance! :)

Side note : My iOS app is using TCP sockets to communicate with a server I have written in Python, following this tutorial by Cesare Rocchi.

You haven't provided enough information to understand fully what you're trying to do. Are you saying that responding to stream events isn't sufficient to maintain control flow? — Extra Savoir-Faire, Aug 22 '13 at 16:37
I'm saying no event is received until after leaving the for loops! Sorry for the lack of clarity — PidgeyBAWK, Aug 23 '13 at 08:27
That would make sense. Program flow won't reach your `-stream:handleEvent:` method until you get out of your loop. — Extra Savoir-Faire, Aug 23 '13 at 17:41
It is, but you'll never get it while you're in a `for` loop that keeps your application from running its event loop. (Assuming that you scheduled your streams on the main event loop.) — Extra Savoir-Faire, Aug 24 '13 at 17:30

Objective C - NSOutputStream events arriving with delay

0 Answers0