IOKit notifications

• ed despard IOKit notifications Nov 17 2006, 14:52
  I apologize for the other two empty body messages with the same
  title, Im not sure what was happening with my mail client.
  
  Hi, Im trying to receive notifications of usb device connection and
  termination from within my cocoa apps.  Apples CF based example code
  works fine, but when I converted their code to work in my
  application, i never receive any notifications.  The relevent code is
  provided below
  
  - (void) awakeFromNib
  {
  kern_return_t  kr;
  
  NSMutableDictionary* matchingDict = IOServiceMatching
  (kIOUSBDeviceClassName);
  NSNumber* usbVendor = [NSNumber numberWithInt:1027];
  NSNumber* usbProduct = [NSNumber numberWithInt:24592];
  [matchingDict takeValue:usbVendor forKey:@"kUSBVendorID"];
  [matchingDict takeValue:usbProduct forKey:@"kUSBProductID"];
  
  notifyPort = IONotificationPortCreate(kIOMasterPortDefault);
  CFRunLoopSourceRef  runLoopSource;
  runLoopSource = IONotificationPortGetRunLoopSource(notifyPort);
  NSRunLoop* currentRunLoop = [NSRunLoop currentRunLoop];
  CFRunLoopRef CFRunLoop = [currentRunLoop getCFRunLoop];
  CFRunLoopAddSource(CFRunLoop, runLoopSource, kCFRunLoopDefaultMode);
  
  kr = IOServiceAddMatchingNotification( notifyPort,  // notifyPort
        kIOFirstMatchNotification, // notificationType
        matchingDict,  // matching
        DeviceAdded,  // callback
        NULL,    // refCon
        &gAddedIter
        );
  DeviceAdded(NULL,gAddedIter);
  }
  
  the usbVendor and USBProduct ids are correct for my device.
  notifyport is a member of the class
  IOServiceAddMatchingNotification does return KERN_SUCCESS
  
  thanks,
  Ed Despard
• Florent Pillet Re: IOKit notifications Nov 24 2006, 09:39
  I do it slightly differently in my code. Though the thread I use for USB
  is not using Cocoa, I think the code below should work for you:
  
  NSNumber* usbVendor = [NSNumber numberWithInt:1027];
  NSNumber* usbProduct = [NSNumber numberWithInt:24592];
  
  NSMutableDictionary* matchingDict =
      IOServiceMatching(kIOUSBDeviceClassName);
  [matchingDict takeValue:usbVendor forKey:@"kUSBVendorID"];
  [matchingDict takeValue:usbProduct forKey:@"kUSBProductID"];
  
  mach_port_t masterPort;
  kern_return_t kr;
  CFRunLoopSourceRef runLoopSource;
  
  kr = IOMasterPort (MACH_PORT_NULL, &masterPort);
  if (!kr && masterPort) {
      notifyPort = IONotificationPortCreate (masterPort);
      runLoopSource = IONotificationPortGetRunLoopSource (notifyPort);
  
      CFRunLoopAddSource([[NSRunLoop currentRunLoop] getCurrentRunLoop],
                          runLoopSource,
                          kCFRunLoopDefaultMode);
  
      kr = IOServiceAddMatchingNotification(
                          notifyPort,
                          kIOFirstMatchNotification,
                          matchingDict,
                          DeviceAdded,
                          NULL,
                          &gAddedIter);
  
      DeviceAdded(NULL, gAddedIter);    // arm the notification
  
      mach_port_deallocate (mach_task_self(), masterPort);
  }
  
  
  I believe this may work better in your context. If this doesn't, you may
  want to join Apple's USB mailing list and ask the question to the
  experts there.
  
  HTH,
  Florent
  
  ed despard wrote:
  

  > I apologize for the other two empty body messages with the same title,
  > Im not sure what was happening with my mail client.
  >
  > Hi, Im trying to receive notifications of usb device connection and
  > termination from within my cocoa apps.  Apples CF based example code
  > works fine, but when I converted their code to work in my application, i
  > never receive any notifications.  The relevent code is provided below
  >
  >
  > - (void) awakeFromNib
  > {
  > kern_return_t        kr;
  >
  > NSMutableDictionary* matchingDict =
  > IOServiceMatching(kIOUSBDeviceClassName);
  > NSNumber* usbVendor = [NSNumber numberWithInt:1027];
  > NSNumber* usbProduct = [NSNumber numberWithInt:24592];
  > [matchingDict takeValue:usbVendor forKey:@"kUSBVendorID"];
  > [matchingDict takeValue:usbProduct forKey:@"kUSBProductID"];
  >
  > notifyPort = IONotificationPortCreate(kIOMasterPortDefault);
  > CFRunLoopSourceRef        runLoopSource;
  > runLoopSource = IONotificationPortGetRunLoopSource(notifyPort);
  > NSRunLoop* currentRunLoop = [NSRunLoop currentRunLoop];
  > CFRunLoopRef CFRunLoop = [currentRunLoop getCFRunLoop];
  > CFRunLoopAddSource(CFRunLoop, runLoopSource, kCFRunLoopDefaultMode);
  >
  > kr = IOServiceAddMatchingNotification(    notifyPort,            //
  > notifyPort
  > kIOFirstMatchNotification,    // notificationType
  > matchingDict,            // matching
  > DeviceAdded,            // callback
  > NULL,                // refCon
  > &gAddedIter
  > );
  > DeviceAdded(NULL,gAddedIter);
  > }
  >
  > the usbVendor and USBProduct ids are correct for my device.
  > notifyport is a member of the class
  > IOServiceAddMatchingNotification does return KERN_SUCCESS
  >
  >
  > thanks,
  > Ed Despard
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  --
  Florent Pillet                  http://www.florentpillet.com
  Software consultant - Mac OS X, Palm OS, Windows Mobile
  Skype callto://florent.pillet