Python API Reference - BarcodeReader Decode Methods

Method	Description
`decode_file`	Decodes barcodes from a specified image file.
`decode_buffer`	Decodes barcodes from the memory buffer containing image pixels in defined format.
`decode_file_stream`	Decodes barcodes from an image file in memory.
`decode_buffer_manually`	Decodes barcodes from the memory buffer containing image pixels in defined format.

decode_file

Decode barcodes from a specified image file.

BarcodeReader.decode_file(image_file_name, template_name="")

Parameters

[in] image_file_name <str> : A string defining the file name.
[in] template_name <optional><str> : The template name.

Return value

text_results <*list[class TextResult]*> : All text results.

Exceptions

BarcodeReaderError The exception thrown by Dynamsoft Barcode Reader.

Code Snippet

from dbr import *
license_key = 't0260NwAAAHV***************'
image_file = r'C:\Program Files (x86)\Dynamsoft\{Version number}\Images\AllSupportedBarcodeTypes.tif'

reader = BarcodeReader()
reader.init_license(license_key)
try:
    text_results = reader.decode_file(image_file)
    if text_results != None:
        for text_result in text_results:
            print("Barcode Format :")
            print(text_result.barcode_format_string)
            print("Barcode Text :")
            print(text_result.barcode_text)
            print("Localization Points : ")
            print(text_result.localization_result.localization_points)
            print("-------------")
except BarcodeReaderError as bre:
    print(bre)

decode_buffer

Decodes barcodes from the memory buffer containing image pixels in defined format.

BarcodeReader.decode_buffer(image, image_pixel_format=EnumImagePixelFormat.IPF_RGB_888, template_name="")

Parameters

[in] image <class numpy.ndarray> : The image which is processed by opencv.
[in] image_pixel_format <class EnumImagePixelFormat> : The image pixel format used in the image byte array.
[in] template_name <optional><str> : The template name.

Return value

text_results <*list[class TextResult]*> : All text results.

Exception

BarcodeReaderError : If error happens, this function will throw a BarcodeReaderError exception that can report the detailed error message.

Code Snippet

import cv2
from dbr import *
license_key = 't0260NwAAAHV***************'
image_file = r'C:\Program Files (x86)\Dynamsoft\{Version number}\Images\AllSupportedBarcodeTypes.tif'

image = cv2.imread(image_file)

reader = BarcodeReader()
reader.init_license(license_key)
try:
    text_results = reader.decode_buffer(image)
    if text_results != None:
        for text_result in text_results:
            print("Barcode Format :")
            print(text_result.barcode_format_string)
            print("Barcode Text :")
            print(text_result.barcode_text)
            print("Localization Points : ")
            print(text_result.localization_result.localization_points)
            print("-------------")
except BarcodeReaderError as bre:
    print(bre)

decode_file_stream

Decodes barcodes from an image file in memory.

BarcodeReader.decode_file_stream(file_stream, template_name="")

Parameters

[in] file_stream <bytearray> : The image file bytes in memory.
[in] templateName <optional><str>: The template name.

Return value

All barcode text results decoded successfully.

Exceptions

BarcodeReaderError The exception thrown by Dynamsoft Barcode Reader.

Code Snippet

from dbr import *
license_key = 't0260NwAAAHV***************'
image_file = r'C:\Program Files (x86)\Dynamsoft\{Version number}\Images\AllSupportedBarcodeTypes.tif'

with open(image_file, "rb") as fread:
    total = fread.read()

reader = BarcodeReader()
reader.init_license(license_key)
try:
    text_results = reader.decode_file_stream(bytearray(total))
    if text_results != None:
        for text_result in text_results:
            print("Barcode Format :")
            print(text_result.barcode_format_string)
            print("Barcode Text :")
            print(text_result.barcode_text)
            print("Localization Points : ")
            print(text_result.localization_result.localization_points)
            print("-------------")
except BarcodeReaderError as bre:
    print(bre)

decode_buffer_manually

Decodes barcodes from the memory buffer containing image pixels in defined format.

BarcodeReader.decode_buffer_manually(self, buffer, width, height, stride, image_pixel_format, template_name="")

Parameters

[in] buffer <bytes or bytearray> : The array of bytes which contain the image data. [in] width <int> : The width of the image in pixels. [in] height <int> : The height of the image in pixels. [in] stride <int> : The stride (or scan width) of the image. [in] image_pixel_format <class EnumImagePixelFormat> : The image pixel format used in the image byte array. Default value = EnumImagePixelFormat.IPF_RGB_888. [in] template_name <optional><str> : The template name.

Return value

text_results <list[class TextResult]> : All text results.

Exception

BarcodeReaderError : If error happens, this function will throw a BarcodeReaderError exception that can report the detailed error message.