CocoaDev

I am trying to write a Cocoa app that works with a USB device.

I am using the Apple sample code as a guide but it is code for a FOUNDATION tool - NOT a Cocoa app.

Here are the steps that I am doing:

1) I call IONotificationPortCreate - to create a notification object 2) I call IONotificationPortGetRunLoopSource- to get the runloop source of the object from step 1 3) call CFRunLoopAddSource with CFRunLoopGetCurrent as a parameter - to add the source to my runloop 4) I create a matching dictionary that matches my USB device - I tested this function and it DEFINTELY matches my USB device 5) I call IOServiceAddMatchingNotification - it returns err_none

Then my app never gets ANY notifications of USB device removal or attachment.

I even tried adding in a call to CFRunLoopRun like the Apple sample code does but my app just hung.

Has anyone got IOServiceAddMatchingNotification working from a Cocoa app?

I have this working on my cocoa app, watching for serial ports:

// related instance variables:
IONotificationPortRef   nport;
io_iterator_t           serialPortIterator;

• (void)startWatchingForSerialPorts { nport = IONotificationPortCreate(kIOMasterPortDefault);

  CFMutableDictionaryRef match = IOServiceMatching(kIOSerialBSDServiceValue); CFDictionarySetValue(match, CFSTR(kIOSerialBSDTypeKey), CFSTR(kIOSerialBSDAllTypes));

  CFRunLoopAddSource(CFRunLoopGetCurrent(), IONotificationPortGetRunLoopSource(nport), kCFRunLoopCommonModes); // NOTE IOServiceAddMatchingNotification uses the dictionary, so we pass a copy IOServiceAddMatchingNotification(nport, kIOPublishNotification, CFDictionaryCreateMutableCopy(NULL, 0, match), (IOServiceMatchingCallback)serial_port_added, self, &serialPortIterator); while (IOIteratorNext(serialPortIterator)) {}; // could call serial_port_added(self, serialPortIterator) to notify of existing serial ports IOServiceAddMatchingNotification(nport, kIOTerminatedNotification, match, (IOServiceMatchingCallback)serial_port_removed, self, &serialPortIterator); while (IOIteratorNext(serialPortIterator)) {};

}

• (void)stopWatchingForSerialPorts { CFRunLoopRemoveSource(CFRunLoopGetMain(), IONotificationPortGetRunLoopSource(nport), kCFRunLoopDefaultMode); IONotificationPortDestroy(nport); IOObjectRelease(serialPortIterator); }

• (void)didAddSerialPort:(NSString*) deviceName { [serialPortsMenu addItemWithTitle: deviceName]; }

• (void)didRemoveSerialPort:(NSString*) deviceName { [serialPortsMenu removeItemWithTitle: deviceName]; }

void serial_port_added (id self, io_iterator_t iter) { io_registry_entry_t serialPort; while (serialPort = IOIteratorNext(iter)) { CFTypeRef path; path = IORegistryEntryCreateCFProperty(serialPort, CFSTR(kIODialinDeviceKey), kCFAllocatorDefault, 0); [self didAddSerialPort:[(NSString*)path lastPathComponent]]; CFRelease(path); IOObjectRelease(serialPort); } }

void serial_port_removed (id self, io_iterator_t iter) { io_registry_entry_t serialPort; while (serialPort = IOIteratorNext(iter)) { CFTypeRef path; path = IORegistryEntryCreateCFProperty(serialPort, CFSTR(kIODialinDeviceKey), kCFAllocatorDefault, 0); [self didRemoveSerialPort:[(NSString*)path lastPathComponent]]; CFRelease(path); IOObjectRelease(serialPort); } }