evdev.py 文件源码

def readMetadata(self):
        """Read device identity and capabilities via ioctl()"""
        buffer = "\0"*512

        # Read the name
        self.name = ioctl(self.fd, EVIOCGNAME_512, buffer)
        self.name = self.name[:self.name.find("\0")]

        # Read info on each absolute axis
        absmap = Event.codeMaps['EV_ABS']
        buffer = "\0" * struct.calcsize("iiiii")
        self.absAxisInfo = {}
        for name, number in absmap.nameMap.iteritems():
            try:
                values = struct.unpack("iiiii", ioctl(self.fd, EVIOCGABS_512 + number, buffer))
                values = dict(zip(( 'value', 'min', 'max', 'fuzz', 'flat' ),values))
                self.absAxisInfo[name] = values
            except IOError:
                continue