CODEWITHSUNDEEP
iphone
Kashif Jilani
Kashif Jilani

Reputation: 1257

How to call JSON webservice from background in iPhone

i need to know is it possible to call json webservices from background, when the user press the home button, i am calling this method from background execution

- (void) runTimer 
{
    [NSThread detachNewThreadSelector:@selector(updateAllVisibleElements)toTarget:self withObject:nil]; 
}

- (void) updateAllVisibleElements  {

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    if(service == nil)
    {
        service = [[WebService alloc] init];
    }
    [service getlocationID:currentLatitude andlongitude:currentLongitute];
    [pool release];
}

and in called the function [service getlocation id] however after that it doesn't show any response or data recieves and app terminates, plz help me

Upvotes: 2

Views: 1022

Answers (2)

KevinDTimm
KevinDTimm

Reputation: 14376

if(service == nil)
{
    service = [[WebService alloc] init];
}
[service getlocationID:currentLatitude andlongitude:currentLongitute];

Note that you never test that service is a good value (not nil) before you make the call

Upvotes: 0

Daniel Dickison
Daniel Dickison

Reputation: 21882

If you want it to happen immediately after the app goes to the background, you can probably use -[UIApplication beginBackgroundTaskWithExpirationHandler:]. That should work as long as the task doesn't take too long.

Upvotes: 2

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