iOS exception handling problem - iphone

Question

I have problem in following code.
int i = 10;
NSString *str;
#try {
//Error
str = [[NSString alloc] initWithFormat:#"%#",i];
//Warning
NSLog(#"%i",str);
}
#catch (id exception) {
NSLog(#"Hello !!!");
}
Please help me out how to handle exception in i/o operation.
Thanks.
Edited by Justin
there's no suitable place for me to provide this program to you, so i put it here.
try using the following program to reformulate your question:
static void bad_program() {
#try {
id array = [NSArray array];
NSLog(#"will throw...");
[array stringByAbbreviatingWithTildeInPath];
}
#catch (id exception) {
NSLog(#"\n*** Caught Exception:\n***** Exception Detail: %#\nResolution: Exception swallowed\n", exception);
}
}
# Justin, Result of above code
It does not fire exception. It is crashed showing following error.
Sorry Justin, please see if you could help me more. Thanks.
2011-08-25 15:06:48.444 TestError[5120:b303] will throw...
2011-08-25 15:06:48.446 TestError[5120:b303] -[__NSArrayI stringByAbbreviatingWithTildeInPath]: unrecognized selector sent to instance 0x4b38e10
2011-08-25 15:06:48.465 TestError[5120:b303] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI stringByAbbreviatingWithTildeInPath]: unrecognized selector sent to instance 0x4b38e10'
*** Call stack at first throw:
(
0 CoreFoundation 0x00dc05a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f14313 objc_exception_throw + 44
2 CoreFoundation 0x00dc20bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x00d31966 ___forwarding___ + 966
4 CoreFoundation 0x00d31522 _CF_forwarding_prep_0 + 50
5 TestError 0x00002454 -[TestErrorViewController viewDidLoad] + 164
6 UIKit 0x000c2089 -[UIViewController view] + 179
7 UIKit 0x00035d42 -[UIWindow addRootViewControllerViewIfPossible] + 51
8 TestError 0x00002087 -[TestErrorAppDelegate application:didFinishLaunchingWithOptions:] + 135
9 UIKit 0x00012c89 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163
10 UIKit 0x00014d88 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 439
11 UIKit 0x0001f617 -[UIApplication handleEvent:withNewEvent:] + 1533
12 UIKit 0x00017abf -[UIApplication sendEvent:] + 71
13 UIKit 0x0001cf2e _UIApplicationHandleEvent + 7576
14 GraphicsServices 0x00ff9992 PurpleEventCallback + 1550
15 CoreFoundation 0x00da1944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
16 CoreFoundation 0x00d01cf7 __CFRunLoopDoSource1 + 215
17 CoreFoundation 0x00cfef83 __CFRunLoopRun + 979
18 CoreFoundation 0x00cfe840 CFRunLoopRunSpecific + 208
19 CoreFoundation 0x00cfe761 CFRunLoopRunInMode + 97
20 UIKit 0x000147d2 -[UIApplication _run] + 623
21 UIKit 0x00020c93 UIApplicationMain + 1160
22 TestError 0x00001fc9 main + 121
23 TestError 0x00001f45 start + 53
24 ??? 0x00000001 0x0 + 1
)
terminate called throwing an exceptionsharedlibrary apply-load-rules all

Answer 1

I got answer of this question.
Some exception cannnot catch and some exception will only work for device not on the simulator.