import os from i18n import _ try: import zbar except ImportError: zbar = None proc = None def scan_qr(config): global proc if not zbar: raise RuntimeError("\n".join([_("Cannot start QR scanner."),_("The zbar package is not available."),_("On Linux, try 'sudo pip install zbar'")])) if proc is None: device = config.get("video_device", "default") if device == 'default': device = '' _proc = zbar.Processor() _proc.init(video_device=device) # set global only if init did not raise an exception proc = _proc proc.visible = True while True: try: proc.process_one() except Exception: # User closed the preview window return "" for r in proc.results: if str(r.type) != 'QRCODE': continue # hiding the preview window stops the camera proc.visible = False return r.data def _find_system_cameras(): device_root = "/sys/class/video4linux" devices = {} # Name -> device if os.path.exists(device_root): for device in os.listdir(device_root): name = open(os.path.join(device_root, device, 'name')).read() name = name.strip('\n') devices[name] = os.path.join("/dev",device) return devices