[kman42]

I can't seem to get exceptions to work properly. I have read through the Apple docs, but I keep getting a strange error. Here's what I'm doing:

Code:
-(void)getInfoFromLog:(id)sender {
    NSLog(@"start getInfoFromLbg");
    if ([logFileDirectory isEqualToString:@"Not Entered"]) {

    }
    else {

        NSAutoreleasePool *logpool = [[NSAutoreleasePool alloc] init];

        NS_DURING
        NSArray *directoryContents = [[NSFileManager defaultManager] directoryContentsAtPath:logFileDirectory];
        if (!directoryContents) {
            NSException* fileNotFoundException = [NSException
        exceptionWithName:@"FileNotFoundException"
                   reason:@"File Not Found on System"
                 userInfo:nil];
            [fileNotFoundException raise];
            
        }
    
        NSString *currentLogFile;
      
...


return;
        NS_HANDLER
            if ([[localException name] isEqualToString:@"FileNotFoundException"]) {
                NSRunAlertPanel(@"Error Panel", @"%@", @"OK", nil, nil,
                                localException);

            }
            //[localException raise]; /* Re-raise the exception. */
        NS_ENDHANDLER

}

I keep getting an this error:

'parse error before "else"' on the NS_HANDLER line.

Can someone give me a quick what's up on Cocoa exceptions. I get the basics, but just can't seem to get them to work in the real world.

kman

[Rickster]

You need to enclose the bocks within the handler... like this:

Code:
NS_DURING {
... code ...
} NS_HANDLER {
... more code ...
} NS_ENDHANDLER

Also, I'm not sure what you've replaced with "..." in your posting, but it looks like you have mismatched {}'s. Turn on syntax-aware indenting in Project Builder -- it'll help you track down which { is missing a }.

[kman42]

Thank you!

Why does Apple not include blocks in their docs:

Code:
NS_DURING
    ...
    if (someError)
        [anException raise];
    ...
NS_HANDLER
    if ([[localException name] isEqualToString:MyAppException]) {
        NSRunAlertPanel(@"Error Panel", @"%@", @"OK", nil, nil, 
                localException);
    }
    [localException raise]; /* Re-raise the exception. */
NS_ENDHANDLER

kman

[kman42]

nevermind.

kman

[kman42]

I'm really struggling with this. I think I just need a little real world example. My app gets info from a file stored either locally or remotely. The problem is that sometimes the remote machine becomes unmounted which results in a crash. Can someone help me build an exception routine around this bit of code?

Code:

-(void)getInfoFromLog:(id)sender {
    NSLog(@"start getInfoFromLog");
    if (!([logFileDirectory isEqualToString:@"Not Entered"])) {

        NSAutoreleasePool *logpool = [[NSAutoreleasePool alloc] init];

        NSArray *directoryContents = [[NSFileManager defaultManager] directoryContentsAtPath:logFileDirectory];

        NSString *currentLogFile;
        NSEnumerator *enumerator = [directoryContents objectEnumerator];
        id file;

        while ((file = [enumerator nextObject])) {
            if ([file rangeOfString:@"unitinfo.txt" options:NSCaseInsensitiveSearch].location != NSNotFound)
                currentLogFile = file;
        }

...

I think the exception routine needs to go around the "NSArray *directoryContents = " line. Is there a builtin exception for 'unable to read directory' or something? Is there a list of builtin exception names?

sorry to be such a newb,
kman

[eno]

Originally posted by Rickster:
You need to enclose the bocks within the handler... like this:

Code:
NS_DURING {
... code ...
} NS_HANDLER {
... more code ...
} NS_ENDHANDLER

Erm... None of my code, nor any of Apple's examples, enclose the blocks within curly brackets, and they all work fine.

I would say the brackets are entirely optional.