On Apr 4, 2012, at 7:33 PM, Corbin Dunn wrote:
>
> On Apr 4, 2012, at 9:29 AM, Andreas Grosam <agro...@onlinehome.de> wrote:
>
>> The problem on Mac OS X in Cocoa Apps is, that there is no alert. The
>> application also does not stop, or terminate gracefully. The default
>> behavior of the event loop is to log an error message, and then **continue**.
>
> No, there is an alert! you just have to turn it on. From:
>
> https://developer.apple.com/library/mac/#releasenotes/Cocoa/AppKit.html
>
> "AppKit now has the ability to report uncaught exceptions. It is controlled
> by a user default: NSApplicationShowExceptions (YES/NO). The default shipping
> value is NO. In general, it is recommend that developers set it to YES during
> development to catch programming errors. Individual applications can
> automatically turn this on by using [[NSUserDefaults standardUserDefaults]
> registerDefaults: ...] to register the option on. It can be set with defaults
> via: 'defaults write com.yourdomain.app NSApplicationShowExceptions YES'. It
> can also globally be turned on by writing to the global domain."
>
> --corbin
I'm obviously missing something. I've the following code in a Mac OS X App,
which I created straight from an Xcode template:
In AppDelegate.m:
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
NSDictionary* defaults = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES],
@"NSApplicationShowExceptions",
nil];
[[NSUserDefaults standardUserDefaults] registerDefaults: defaults];
[[NSUserDefaults standardUserDefaults] synchronize];
if (test_ == nil) {
test_ = [[JTTest alloc] initWithString:nil]; // throws if parameter
string equals nil
}
}
And in JTTest.m:
- (id)initWithString:(NSString*)string
{
self = [super init];
if (self) {
if (string == nil) {
//NSParameterAssert(string); alternatively
NSException* myException = [NSException
exceptionWithName:@"Invalid Parameter"
reason:@"parameter 'string' is nil"
userInfo:nil];
@throw myException;
}
string_ = [string retain];
}
return self;
}
The application starts and immediately throws an exception. There is a log in
the console as expected - but there is NO alert and the app continues.
Additionally, I also enabled the flag NSApplicationShowExceptions in the global
domain via
$ defaults write -g NSApplicationShowExceptions YES
in the console and launched the test app via
$ open test.app
I'm on Mac OS X, 10. 7.3. There is NO alert.
Andreas
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