ORSSerialPortManager:shouldAddSerialPort: sample

gistfile1.m

- (BOOL)serialPortManager:(ORSSerialPortManager *)manager shouldAddSerialPort:(ORSSerialPort *)serialPort {
    CFMutableDictionaryRef usbProperties = 0;
    io_object_t device = 0;
    io_iterator_t iterator = 0;
    BOOL add = NO;
    if (KERN_SUCCESS == IORegistryEntryCreateIterator(serialPort.device, kIOServicePlane, kIORegistryIterateRecursively + kIORegistryIterateParents, &iterator)) {
        while ((device = IOIteratorNext(iterator))) {
            if (KERN_SUCCESS == IORegistryEntryCreateCFProperties(device, &usbProperties, kCFAllocatorDefault, kNilOptions)) {
                NSUInteger vendorId = 0, productId = 0;
                CFTypeRef reference;
                reference = CFDictionaryGetValue(usbProperties, CFSTR(kUSBVendorID));
                if (reference) {
                    CFNumberGetValue(reference, kCFNumberIntType, &vendorId);
                }
                reference = CFDictionaryGetValue(usbProperties, CFSTR(kUSBProductID));
                if (reference) {
                    CFNumberGetValue(reference, kCFNumberIntType, &productId);
                }
                if (vendorId && productId) { // we have a USB device
                    add = (vendorId == 0x4d8 && product == 0xff7e);
                    IOObjectRelease(device); // release because we skip the normal release in the loop
                    break;
                }
            }
            IOObjectRelease(device); // release device before next iteration
        }
    }
    IOObjectRelease(iterator);
    return add;
}