usb notification

[Chris Carson]

Hi all,

Can't get a simple example working. AppearedNotificationHandler() should be 
called in the code below when a USB device (any device for now) is plugged in. 
I see the NSLog(@"registerDeviceCallbackHandler") message appear in the console 
when I start the application, but never see the 
NSLog(@"AppearedNotificationHandler") message when I plug in a device. What am 
I missing?

Note: The project's MainMenu.nib Interface Builder file has an NSObject whose 
class is "USBDriver".


static void AppearedNotificationHandler (void * refCon, io_iterator_t iterator);

@interface USBDriver(Private)
- (void) registerDeviceCallbackHandler;
@end

@implementation USBDriver(Private)

- (void) registerDeviceCallbackHandler
{
        IOReturn                kernErr;
        CFRunLoopSourceRef      runLoopSource;
        CFMutableDictionaryRef  matchingDict = IOServiceMatching 
(kIOUSBDeviceClassName);
        CFRunLoopRef            runLoop;
        
        // Create the port on which we will receive notifications. We'll wrap 
it in a runLoopSource
        // which we then feed into the runLoop for async event notifications.
        deviceNotifyPort = IONotificationPortCreate (kIOMasterPortDefault);
        if (deviceNotifyPort == NULL)
        {
                return;
        }
        
        // Get a runLoopSource for our mach port.
        runLoopSource = IONotificationPortGetRunLoopSource (deviceNotifyPort);

        matchingDict = (CFMutableDictionaryRef) CFRetain (matchingDict);
        
        kernErr = IOServiceAddMatchingNotification (deviceNotifyPort,
                                                    kIOFirstMatchNotification,
                                                    matchingDict,
                                                    AppearedNotificationHandler,
                                                    (void *) self,
                                                    &deviceAppearedIterator);
        
        kernErr = IOServiceAddMatchingNotification (deviceNotifyPort,
                                                    kIOTerminatedNotification,
                                                    matchingDict,
                                                    
DisappearedNotificationHandler,
                                                    (void *) self,
                                                    &deviceDisappearedIterator 
);

        // Get our runLoop
        runLoop = [[NSRunLoop currentRunLoop] getCFRunLoop];
        
        // Add our runLoopSource to our runLoop
        CFRunLoopAddSource (runLoop, runLoopSource, kCFRunLoopDefaultMode);
        
        NSLog(@"registerDeviceCallbackHandler");
}

@end


@implementation USBDriver

- (id) init
{
        [super init];
        
        if (self) {
                deviceNotifyPort                = IO_OBJECT_NULL;
                deviceAppearedIterator          = 0;

                [self registerDeviceCallbackHandler];
        }
        
        return self;
}

@end

static void AppearedNotificationHandler (void * refCon, io_iterator_t iterator)
{
        NSLog(@"AppearedNotificationHandler");
}


Any help is much appreciated.

Thanks,
Chris


      

_______________________________________________

Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com

This email sent to arch...@mail-archive.com