Re: try/catch/throw/finally example?
Re: try/catch/throw/finally example?
- Subject: Re: try/catch/throw/finally example?
- From: Todd Yandell <email@hidden>
- Date: Fri, 25 Aug 2006 14:06:52 -0500
On Aug 25, 2006, at 12:38 PM, Roland Silver wrote:
Can someone suggest a tutorial or example of the use of @try,
@catch, @throw, @finally, in Objective-C, other than the Apple
document "Exception Handling and Thread Synchronization"?
NSString *stringOne = @"One";
NSString *stringTwo = @"Two";
@try {
[stringOne appendString:stringTwo];
} @catch (id theException) {
NSLog(@"%@ doesn't respond to appendString:!", [stringOne class]);
} @finally {
NSLog(@"This always happens.");
}
@throw [NSException exceptionWithName:@"Test"
reason:@"Testing the @throw directive." userInfo:nil];
In the "@catch" block, "theException" will point to an NSException
that describes the exception that was caught. The "@finally" block
will always be executed, whether an exception was thrown or not.
Normally you would use "@finally" to clean up any objects you created
in the try "@try" block.
The "@throw" directive does the same thing as "[myException throw]".
You also need to enable these options in your build settings. In
Xcode, check the "Enable Objective-C Exceptions" box in your target's
build settings. With GCC, you need to use the "-fobjc-exceptions" flag.
Todd
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