NSFileHandle readInBackgroundAndNotify does not work

Question

Hi I'm using NSFileHandle's readInBackgroundAndNotify method to get notifications when a log file has been updated.

I have the following code:

- (void)startReading
{

NSString *logPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Logs/MyTestApp.log"];
    NSFileHandle *fh = [NSFileHandle fileHandleForReadingAtPath:logPath];
    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
    [notificationCenter addObserver:self
               selector:@selector(getData:)
                name:NSFileHandleReadCompletionNotification
                 object:fh];
    [fh readInBackgroundAndNotify];

}

- (void) getData: (NSNotification *)aNotification
{
     NSLog(@"notification received");
}

However the selector is never called and the notification is not received.

Answer 1

1. Add an NSLog to startReading to make sure that's getting called.
2. Log fh. My guess is that it's nil (most probably because you haven't created MyTestApp.log yet).

Answer 2

to PCWiz :

i am Giga .i have the same question ,now i still not solved this .

can you tell me ,how to receive the filehandle's NSFileHandleReadCompletionNotification .

please mail to me for your soluation .

thanks you !