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