Iphone application issue

Question

Hello Experts ,
I am creating an iphone application using sybase unwired platform 1.5.3 .
I have generated the code from sup and taken the required api's onto xcode in my project .
The issue i am facing is while fetching data from sup .
As mentioned on the sybase website , i have written the code in my delegate file .
It works fine uptil i subscribe to my database eg [abcDB subscribe];
after this there is a step as follows :
while ([(abccallbackhandler *)[abcDB callbackhandler] importsuccesscount ]>1)
sleep(1);
It does not come out of this loop
Tried lot of things from the sybase website and searching on the net as well but none worked .
Please help me on this as i am not able to proceed because of this issue .
Thanks & regards ,
rockyy .

Answer 1

Hello Rockky,
In a SUP MBS-based application, you should never block the main thread with a busy loop as in your example.  In the SUP documentation this is done just as an example.  Rather than blocking with a busy loop, wait for the appropriate notifications using the call back handler.  In your case, you should call subscribe and let the method continue.  If you are displaying a progress/loading view that must be hidden after all data is pulled down to the device, you should hide this view when you receive the onSubscribeSuccess notification, or more appropriately, the onImportSuccess notification which will be called after all data has been pulled down after subscribing. 
Relying on the call back notifications rather than busy loops frees up the main thread keeping your UI responsive. 
Hope this helps. 
Best regards,
Mike