from evdev import InputDevice, ecodes, list_devices, categorize class USB_KB: keys = { # Scancode: ASCIICode 0: None, 1: u'ESC', 2: u'1', 3: u'2', 4: u'3', 5: u'4', 6: u'5', 7: u'6', 8: u'7', 9: u'8', 10: u'9', 11: u'0', 12: u'-', 13: u'=', 14: u'BKSP', 15: u'TAB', 16: u'Q', 17: u'W', 18: u'E', 19: u'R', 20: u'T', 21: u'Y', 22: u'U', 23: u'I', 24: u'O', 25: u'P', 26: u'[', 27: u']', 28: u'CRLF', 29: u'LCTRL', 30: u'A', 31: u'S', 32: u'D', 33: u'F', 34: u'G', 35: u'H', 36: u'J', 37: u'K', 38: u'L', 39: u';', 40: u'"', 41: u'`', 42: u'LSHFT', 43: u'\\', 44: u'Z', 45: u'X', 46: u'C', 47: u'V', 48: u'B', 49: u'N', 50: u'M', 51: u',', 52: u'.', 53: u'/', 54: u'RSHFT', 56: u'LALT', 100: u'RALT' } KB_DEV = None KB_DEV_NAME = None CODE = "" def __init__(self, devName=None): if(devName != None): self.KB_DEV_NAME = devName if(self.KB_DEV_NAME != None): self.getDev() def getAllDev(self): for device in devices: print device def reInit(self): # Refresh Barcode if not found if(self.KB_DEV is None): self.getDev() def read(self): if(self.KB_DEV != None): try: if(self.KB_DEV.read_one() != None): for event in self.KB_DEV.read_loop(): if event is None: self.CODE = "" if event is not None: if event.type == ecodes.EV_KEY: data = categorize(event) if data.keystate == 0 and data.scancode != 42: # Catch only keyup, and not Enter if data.scancode == 28: #looking return key to be pressed ret = self.CODE self.CODE = '' return ret else: self.CODE += self.keys[data.scancode] except: self.KB_DEV = None pass def getDev(self): # Get Keyboard Device devices = map(InputDevice, list_devices()) for device in devices: if device.name == self.KB_DEV_NAME: self.KB_DEV = InputDevice(device.fn) if(self.KB_DEV != None): try: self.KB_DEV.grab() except: self.KB_DEV = None
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