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#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2015 Thomas Voegtlin
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
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."),_("Try 'sudo apt-get install python-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
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