Objective-c尝试/捕获未捕获 [英] Objective-c Try/Catch not catching

问题描述

是否存在以下原因不起作用的原因?

Is there a reason why the following wouldn't work?

@try {
    CFGetTypeID( NULL );
}
@catch (NSException * e) {
    NSLog(@"Exception: %@", e);
}
@finally {
    NSLog(@"finally");
}

类似于 try/catch问题，但似乎上面的块每次都会崩溃.我知道我的调试器设置正确，因为我在上面的另一个问题中设置了try/catch:

Similar to the try/catch question, only it seems the above block crashes everytime. I know my debugger is setup correctly, as I setup a try/catch above from the other question:

// Test working try catch
NSString* test = [NSString stringWithString:@"ss"];

@try {
    [test characterAtIndex:6];
}
@catch (NSException * e) {
    NSLog(@"Exception: %@", e);
}
@finally {
    NSLog(@"finally");
}

// Now test NULL entry
@try {
    CFGetTypeID( NULL );
}
@catch (NSException * e) {
    NSLog(@"Exception: %@", e);
}
@finally {
    NSLog(@"finally");
}

推荐答案

是的，原因很简单.即，CFGetTypeID(NULL)不会引发异常.崩溃了您无法捕捉到这样的崩溃.

Yes, there is a very simple reason. Namely, CFGetTypeID(NULL) isn't throwing an exception. It's crashing. You can't catch crashes like this.

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