iphone - how to properly handle exceptional situations (signals ?)

Posted by pmilosev on Stack Overflow See other posts from Stack Overflow or by pmilosev
Published on 2010-05-17T12:16:50Z Indexed on 2010/05/17 12:20 UTC
Read the original article Hit count: 213

Filed under:

iphone

|

signal-handling

|

exc-bad-access

Hi

In my iphone app, I want to provide some sort of app termination handler that will do some final work (delete some sensitive data) before the application terminates.

I want to handle as much of the termination situations as possible:
1) User terminates the app
2) The device runs out of battery
3) The system terminates the app due to some reason (e.g. out of memory or app freeze)
4) Application crashes (EXC_BAD_ACCESS or SIGSEGV)

Any other exceptional situation ?
What is the best way to achieve this (e.g. is applicationWillTerminate method called in situation 2) ?
Is it possible to do the cleanup in a signal handler (includes iPhone Security framework calls) ?

regards

© Stack Overflow or respective owner

Related posts about iphone

iphone - direct link to iPhone review form from inside iphone

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to link directly to the review link of one of my Apps. I know that it is possible because Appirater did it in the past, but some change in iTunes turned the API down. Appirater uses this URL NSString *templateReviewURL = @"itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews… >>> More
Buy iPhone 4 Without Contract: $599 (AT&T) and $699 (Verizon)

as seen on Tech Dreams - Search for 'Tech Dreams'
Purchasing iPhone without a contract is a good option when you are planning to gift it to someone or going to use it outside US. Both AT&T and Verizon lets you iPhone 4 without a contract but this information is buried deep under blurred text in FAQs and agreements. Here is the pricing… >>> More
Is it possible to download and run IPhone apps on an IPhone emulator

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am tasked to provide an IPhone client app for our SaaS website. I have never written an IPhone application, nor do I have an IPhone at the moment. Before I can decide whether or not I want to do this myself or outsource this, I'd like to try a few apps myself to get a feeling for the UI. Is… >>> More
iPhone web app from dashcode rss feed template works deployed on simulator but not on iphone

as seen on Stack Overflow - Search for 'Stack Overflow'
iPhone web app from dashcode rss feed template works deployed on simulator but not on iphone. The web app is deployed at; http://www.alila.se/wordpress/index.html If i run the simulator and enter that adress, it fetches the rss feed and displays it. Everything fine. When i enter the adress into… >>> More
Problem running iPhone application on iPhone from Xcode (and in Instruments)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi I have a problem running one application on the iPhone from Xcode (or Instruments). When I try to run the app I get the error message Failed to upload XXX.app in the bottom left corner of Xcode. The strange thing is it actually uploaded the app to the iPhone but it doesn't start it (after this… >>> More

Related posts about signal-handling

Signal Handling in C

as seen on Stack Overflow - Search for 'Stack Overflow'
How can I implement signal Handling for Ctrl-C and Ctrl-D in C....So If Ctrl-C is pressed then the program will ignore and try to get the input from the user again...If Ctrl-D is pressed then the program will terminate... My program follows: int main(){ char msg[400]; while(1){ printf("Enter:… >>> More
How to synchronize multiple proccess in c through basic signal handling

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, people. For a academic exercise i have to implement a program in c for nix platform which is to synchronize multiple processes through signal handling, using only signal,pause,kill and fork basic functions. I searched google and have not found any clear example: I hope the wisdom of one of you… >>> More
MPI signal handling

as seen on Stack Overflow - Search for 'Stack Overflow'
When using mpirun, is it possible to catch signals (for example, the SIGINT generated by ^C) in the code being run? For example, I'm running a parallelized python code. I can except KeyboardInterrupt to catch those errors when running python blah.py by itself, but I can't when doing mpirun -np 1… >>> More
Erlang Linux signal handling

as seen on Stack Overflow - Search for 'Stack Overflow'
Is it possible to trap Linux signals (e.g. SIGUSR1) through an handler in Erlang? (without having to resort to a driver crafted in C) >>> More
Deferring signal handling in Linux

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to figure out how to block a signal in Linux kernel 2.4 (user space) from invoking its handler, but keep it available to be handled later, preferably as soon as I re activate the handling of said signal. The function sigprocmask seem to come up in all my search results, but I can't find… >>> More