Barcode Scanning with OpenCV, Webcam and Dynamsoft Barcode Reader

barcode_scanning.py

#!/usr/bin/env python3

'''
Usage:
   barcode_scanning.py <license.txt>

Keyboard shortcuts:

   ESC - exit
'''
from dbr import *

import numpy as np
import time

import cv2 as cv

from multiprocessing import Process, Queue

def process_barcode_frame(license, frameQueue, resultQueue):
    # Create Dynamsoft Barcode Reader
    reader = BarcodeReader()
    # Apply for a trial license: https://www.dynamsoft.com/customer/license/trialLicense
    reader.init_license(license)
    settings = reader.get_runtime_settings()
    settings.max_algorithm_thread_count = 1
    reader.update_runtime_settings(settings)

    while True:
        results = None

        try:
            frame = frameQueue.get(False, 10)
            if type(frame) is str:
                break
        except:
            continue

        try:
            frameHeight, frameWidth, channel = frame.shape[:3]
            # results = reader.decode_buffer(frame)
            results = reader.decode_buffer_manually(np.array(frame).tobytes(), frameWidth, frameHeight, frame.strides[0], EnumImagePixelFormat.IPF_RGB_888)
        except BarcodeReaderError as error:
            print(error)

        try:
            resultQueue.put(results, False, 10)
        except:
            pass


def main():
    import sys

    try:
        with open(sys.argv[1]) as f:
            license = f.read()
    except:
        license = ""

    reader = BarcodeReader()
    # # Apply for a trial license: https://www.dynamsoft.com/customer/license/trialLicense
    reader.init_license(license)

    # cap = cv.VideoCapture('dbr.mp4')
    cap = cv.VideoCapture(0)
    # cap.set(cv.CAP_PROP_FRAME_WIDTH, 480)
    # cap.set(cv.CAP_PROP_FRAME_HEIGHT, 320)

    # Initialize two queues
    size = 1
    frameQueue = Queue(size)
    resultQueue = Queue(size)

    # Start barcode scanning process
    barcodeScanning = Process(target=process_barcode_frame, args=(license, frameQueue, resultQueue))
    barcodeScanning.start()

    thickness = 2
    color = (0,255,0)
    results = None

    while True:
        _ret, frame = cap.read()

        if not _ret:
            break

        try:
            results = resultQueue.get(False, 10)
        except:
            pass

        if results != None:
            for result in results:
                print("Barcode Format :")
                print(result.barcode_format_string)
                print("Barcode Text :")
                print(result.barcode_text)
                print("Localization Points : ")
                print(result.localization_result.localization_points)
                print("-------------")

                points = result.localization_result.localization_points

                cv.line(frame, points[0], points[1], color, thickness)
                cv.line(frame, points[1], points[2], color, thickness)
                cv.line(frame, points[2], points[3], color, thickness)
                cv.line(frame, points[3], points[0], color, thickness)
                cv.putText(frame, result.barcode_text, points[0], cv.FONT_HERSHEY_SIMPLEX, 0.5, (0,0,255))

            cv.imshow('BarcodeReader', frame)
            break
            
        cv.imshow('BarcodeReader', frame)

        # Append a frame to the frame queue
        try:
            frameQueue.put(frame.copy(), False, 10)
        except:
            pass

        ch = cv.waitKey(1)
        # ESC
        if ch == 27:
            break
    
    frameQueue.put("")
    barcodeScanning.join()
    frameQueue.close()
    resultQueue.close()
    
    cv.waitKey(0)

    print('Done')


if __name__ == '__main__':
    print(__doc__)
    main()
    cv.destroyAllWindows()

hey have any way to print the code with out the * and the error show?

@ColdHC you need a free trial license.