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88 lines
3.4 KiB
88 lines
3.4 KiB
#!/usr/bin/env python |
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# |
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# Electrum - lightweight Bitcoin client |
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# Copyright (C) 2015 Thomas Voegtlin |
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# |
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# Permission is hereby granted, free of charge, to any person |
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# obtaining a copy of this software and associated documentation files |
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# (the "Software"), to deal in the Software without restriction, |
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# including without limitation the rights to use, copy, modify, merge, |
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# publish, distribute, sublicense, and/or sell copies of the Software, |
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# and to permit persons to whom the Software is furnished to do so, |
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# subject to the following conditions: |
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# |
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# The above copyright notice and this permission notice shall be |
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# included in all copies or substantial portions of the Software. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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import os |
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import sys |
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import ctypes |
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if sys.platform == 'darwin': |
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name = 'libzbar.dylib' |
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elif sys.platform in ('windows', 'win32'): |
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name = 'libzbar-0.dll' |
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else: |
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name = 'libzbar.so.0' |
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try: |
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libzbar = ctypes.cdll.LoadLibrary(name) |
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except BaseException: |
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libzbar = None |
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def scan_barcode(device='', timeout=-1, display=True, threaded=False, try_again=True): |
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if libzbar is None: |
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raise RuntimeError("Cannot start QR scanner; zbar not available.") |
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libzbar.zbar_symbol_get_data.restype = ctypes.c_char_p |
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libzbar.zbar_processor_create.restype = ctypes.POINTER(ctypes.c_int) |
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libzbar.zbar_processor_get_results.restype = ctypes.POINTER(ctypes.c_int) |
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libzbar.zbar_symbol_set_first_symbol.restype = ctypes.POINTER(ctypes.c_int) |
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proc = libzbar.zbar_processor_create(threaded) |
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libzbar.zbar_processor_request_size(proc, 640, 480) |
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if libzbar.zbar_processor_init(proc, device.encode('utf-8'), display) != 0: |
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if try_again: |
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# workaround for a bug in "ZBar for Windows" |
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# libzbar.zbar_processor_init always seem to fail the first time around |
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return scan_barcode(device, timeout, display, threaded, try_again=False) |
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raise RuntimeError("Can not start QR scanner; initialization failed.") |
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libzbar.zbar_processor_set_visible(proc) |
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if libzbar.zbar_process_one(proc, timeout): |
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symbols = libzbar.zbar_processor_get_results(proc) |
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else: |
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symbols = None |
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libzbar.zbar_processor_destroy(proc) |
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if symbols is None: |
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return |
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if not libzbar.zbar_symbol_set_get_size(symbols): |
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return |
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symbol = libzbar.zbar_symbol_set_first_symbol(symbols) |
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data = libzbar.zbar_symbol_get_data(symbol) |
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return data.decode('utf8') |
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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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try: |
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with open(os.path.join(device_root, device, 'name')) as f: |
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name = f.read() |
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except IOError: |
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continue |
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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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if __name__ == "__main__": |
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print(scan_barcode())
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