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Barcode Scanner.py
# coding: utf-8
# Barcode scanner demo for Pythonista
# Based on http://www.infragistics.com/community/blogs/torrey-betts/archive/2013/10/10/scanning-barcodes-with-ios-7-objective-c.aspx
from objc_util import *
from ctypes import c_void_p
import ui
import sound
found_codes = set()
main_view = None
AVCaptureSession = ObjCClass('AVCaptureSession')
AVCaptureDevice = ObjCClass('AVCaptureDevice')
AVCaptureDeviceInput = ObjCClass('AVCaptureDeviceInput')
AVCaptureMetadataOutput = ObjCClass('AVCaptureMetadataOutput')
AVCaptureVideoPreviewLayer = ObjCClass('AVCaptureVideoPreviewLayer')
dispatch_get_current_queue = c.dispatch_get_current_queue
dispatch_get_current_queue.restype = c_void_p
def captureOutput_didOutputMetadataObjects_fromConnection_(_self, _cmd, _output, _metadata_objects, _conn):
objects = ObjCInstance(_metadata_objects)
for obj in objects:
s = str(obj.stringValue())
if s not in found_codes:
found_codes.add(s)
sound.play_effect('digital:PowerUp7')
main_view['label'].text = 'Last scan: ' + s
MetadataDelegate = create_objc_class('MetadataDelegate', methods=[captureOutput_didOutputMetadataObjects_fromConnection_], protocols=['AVCaptureMetadataOutputObjectsDelegate'])
@on_main_thread
def main():
global main_view
delegate = MetadataDelegate.new()
main_view = ui.View(frame=(0, 0, 400, 400))
main_view.name = 'Barcode Scanner'
session = AVCaptureSession.alloc().init()
device = AVCaptureDevice.defaultDeviceWithMediaType_('vide')
_input = AVCaptureDeviceInput.deviceInputWithDevice_error_(device, None)
if _input:
session.addInput_(_input)
else:
print('Failed to create input')
return
output = AVCaptureMetadataOutput.alloc().init()
queue = ObjCInstance(dispatch_get_current_queue())
output.setMetadataObjectsDelegate_queue_(delegate, queue)
session.addOutput_(output)
output.setMetadataObjectTypes_(output.availableMetadataObjectTypes())
prev_layer = AVCaptureVideoPreviewLayer.layerWithSession_(session)
prev_layer.frame = ObjCInstance(main_view).bounds()
prev_layer.setVideoGravity_('AVLayerVideoGravityResizeAspectFill')
ObjCInstance(main_view).layer().addSublayer_(prev_layer)
label = ui.Label(frame=(0, 0, 400, 30), flex='W', name='label')
label.background_color = (0, 0, 0, 0.5)
label.text_color = 'white'
label.text = 'Nothing scanned yet'
label.alignment = ui.ALIGN_CENTER
main_view.add_subview(label)
session.startRunning()
main_view.present('sheet')
main_view.wait_modal()
session.stopRunning()
delegate.release()
session.release()
output.release()
if found_codes:
print 'All scanned codes:\n' + '\n'.join(found_codes)
if __name__ == '__main__':
main()
@mku1tr4

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@mku1tr4 mku1tr4 commented Jun 16, 2018

Hi, under which license is this script?

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