list_ports_osx.py 文件源码

def get_int_property(device_t, property):
    """ Search the given device for the specified string property

    @param device_t Device to search
    @param property String to search for.
    @return Python string containing the value, or None if not found.
    """
    key = cf.CFStringCreateWithCString(
        kCFAllocatorDefault,
        property.encode("mac_roman"),
        kCFStringEncodingMacRoman
    )

    CFContainer = iokit.IORegistryEntryCreateCFProperty(
        device_t,
        key,
        kCFAllocatorDefault,
        0
    );

    number = ctypes.c_uint16()

    if CFContainer:
        output = cf.CFNumberGetValue(CFContainer, 2, ctypes.byref(number))

    return number.value