Question

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

Answer 1

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