camera_async_api.py

import barcodeQrSDK
import numpy as np
import cv2
import json

g_results = None


def callback(results):
    global g_results
    g_results = (results)


def run():
    # set license
    barcodeQrSDK.initLicense(
        "DLS2eyJoYW5kc2hha2VDb2RlIjoiMjAwMDAxLTE2NDk4Mjk3OTI2MzUiLCJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSIsInNlc3Npb25QYXNzd29yZCI6IndTcGR6Vm05WDJrcEQ5YUoifQ==")

    # initialize barcode scanner
    scanner = barcodeQrSDK.createInstance()
    params = scanner.getParameters()
    # Convert string to JSON object
    json_obj = json.loads(params)
    params = json.dumps(json_obj)
    ret = scanner.setParameters(params)

    scanner.addAsyncListener(callback)

    cap = cv2.VideoCapture(0)
    while True:
        ret, image = cap.read()
        if image is not None:
            scanner.decodeMatAsync(image)

        if g_results != None:
    
            for result in g_results:
                x1 = result.x1
                y1 = result.y1
                x2 = result.x2
                y2 = result.y2
                x3 = result.x3
                y3 = result.y3
                x4 = result.x4
                y4 = result.y4

                cv2.drawContours(
                    image, [np.array([(x1, y1), (x2, y2), (x3, y3), (x4, y4)], dtype=np.int32)], 0, (0, 255, 0), 2)
                cv2.putText(image, result.text, (x1, y1),
                            cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 255, 0), 2)

        cv2.imshow('Barcode QR Code Scanner', image)
        ch = cv2.waitKey(1)
        if ch == 27:
            break

    scanner.clearAsyncListener()


if __name__ == '__main__':
    run()