Does this library support PDF417?

i got the result
BarCode(raw='This should be QR_CODE', parsed='This should be QR_CODE', format='QR_CODE', type='TEXT', points=[(15.0, 87.0), (15.0, 15.0), (87.0, 15.0), (75.0, 75.0)]),
but the row's content the same with the parsed's content.
i don't know the difference.
could you explain the meanings of the raw and the parsed?give an example is best.

Do you have an example of how to generate a data matrix and control image height and width (number of pixels)?

Hello there

I am trying to install ZXing on Python 3.10.6 and it fails on a Sub-Process when trying to get requirements to build the wheel:

"FileNotFoundError: [Errno 2] No such file or directory: 'requirements.txt'"

Not quite sure what the Problem is in this case, or what I can do to fix it.
I have OpenJDK 21.0.2 installed via Brew

How can I pass an image array to BarcodeReader instead of the filename?

reader = zxing.BarCodeReader()
barcode = reader.decode('image.jpg')

to

cv_image = cv2.imread('image.jpg')
reader = zxing.BarCodeReader()
barcode = reader.decode(cv_image)

Is there any function to do this?

zxing: error: Unknown Java exception: b'Exception in thread "main" java.lang.IllegalArgumentException: URI path component is empty\r\n\tat sun.nio.fs.WindowsUriSupport.fromUri(Unknown Source)\r\n\tat sun.nio.fs.WindowsFileSystemProvider.getPath(Unknown Source)\r\n\tat java.nio.file.Paths.get(Unknown Source)\r\n\tat com.google.zxing.client.j2se.CommandLineRunner.expand(CommandLineRunner.java:112)\r\n\tat com.google.zxing.client.j2se.CommandLineRunner.main(CommandLineRunner.java:76)\r\n'

Hi, I have a problem detecting qrcode which contains Thai characters. Example below:

qr code decoded by zxing wrapper: "ABCC051 ?????????????????????????"
qr code decoded by zbar wrapper: "ABCC051 เอกสารประกอบการขอสินเชื่อ"

Could you please recommend me a way to fix this issue?

Best regards and thank you

Hey there!

when using zxing for QR-Code extraction it can happen that it fails to extract due to the picture/document being of poor quality and the binarizer reading the QR-Code as black square.

I read in the docs that there is a "hybrid-binarizer" that should be working better in such cases but I fail to find the information on how to swap to that binarizer.
Would appreciate some help on this matter.

Tried implmenting it on a windows platform.Found this error after following the error

FileNotFoundError                         Traceback (most recent call last)
<ipython-input-14-57bf31b8a763> in <module>
----> 1 text = reader.decode("ad1.jpg")

~\AppData\Local\Continuum\anaconda3\lib\site-packages\zxing\__init__.py in decode(self, filename, try_harder, possible_formats)
     35                 cmd += ['--possible_formats', pf ]
     36 
---> 37         p = sp.Popen(cmd, stdout=sp.PIPE, universal_newlines=False)
     38         stdout, stderr = p.communicate()
     39 

~\AppData\Local\Continuum\anaconda3\lib\subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, encoding, errors, text)
    773                                 c2pread, c2pwrite,
    774                                 errread, errwrite,
--> 775                                 restore_signals, start_new_session)
    776         except:
    777             # Cleanup if the child failed starting.

~\AppData\Local\Continuum\anaconda3\lib\subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, unused_restore_signals, unused_start_new_session)
   1176                                          env,
   1177                                          os.fspath(cwd) if cwd is not None else None,
-> 1178                                          startupinfo)
   1179             finally:
   1180                 # Child is launched. Close the parent's copy of those pipe

FileNotFoundError: [WinError 2] The system cannot find the file specified

When I have an image file that has other text apart from the aztec code, the library fails to find the code. Is there a way to improve this precision?

Hi may I ask how to install the Command-line interface?(for Linux) The package is otherwise working fine in Python 3.5. Thank you.

Passing a pathlib.Path object as the filenames parameter raises some error:

Traceback (most recent call last):
  File "/home/stefan/temp/run.py", line 57, in <module>
    print(reader.decode(path))
  File "/home/stefan/temp/venv/lib/python3.9/site-packages/zxing/__init__.py", line 80, in decode
    for fn_or_im in filenames:
TypeError: 'PosixPath' object is not iterable

It seems that the library can only detect one barcode?

The pyzxing can read multiple barcodes but it is too slow as it runs java -jar every time.

Hey,
Seems like Travis fails on the Python 3.7 and 3.8 tests, as apparently Travis does not have suitable archives for these versions.

The suggested fix is to use dist: xenial instead of dist:trusty.

Cheers

Thank you for making this library.

I have a collection of barcodes that mostly fail to decode with the python wrapper, but that are successfully decoded using the online ZXing resource here: https://zxing.org/w/decode.jspx. Do you have any insights on what options the online decoder might be using, or how this might differ from your wrapper? Happy to share data privately.

I use "pip install zxing" to install zxing 0.11,and in my venv dir have all the file demand，“core.jar”“javase.jar”“jcommander.jar”，but when run zxing.BarCodeReader().decode(xxx.png) raise error :

"raise BarCodeReaderException("Java binary specified does not exist", self.java, e) zxing.BarCodeReaderException: ('Java binary specified does not exist', 'java', FileNotFoundError(2, '系统找不到指定的文件。', None, 2, None))"

I have been once creating a wrapper with jpype to zxing.
The great thing would be that we avoid parsing issues.

It also allows you to get the metadata from the zxing barcode Object, eg for PDF_417 barcode.

It would simplify the problem a lot but require jpype as well.

You can also keep the java runtime warm and rerun things on demand with single requests.

Using jPype one can just use the main lines from CommandLineRunner of zxing.

Any thoughts on that?

###Bug Reports
I am using zxing module of python to decode QR images like attached below. But it returns empty string.

Image link is 1, 2.
I am using code like below-

from zxing import BarCodeReader
fpath = r"14767.png"
reader = BarCodeReader()
qrcode = reader.decode(fpath)
print(qrcode.raw)

Why it is returning empty string?

Error 1:

• When running the application in a windows environment if zxing fails to identify the barcode, the return value does not include the file URI and the raw value is set to an empty string instead of None.
• Don't have a windows environment available at the moment to provide an example of this. But the error is being cause by:

python-zxing/zxing/__init__.py:183: if l.endswith(b': No barcode found\n'):

• This is because lines on windows end with \r\n and so the statement isn't matched.

Error 2:

• The application is unable to parse results when the file is held on a network share. And results in a index out of bounds error at:

python-zxing/zxing/__init__.py:150: file_results[-1] += line

This is because the preceeding if statement uses b'file:///'. A pattern which is specific to local file paths. As indicated here it should be b'file://'.

This is probably related to issue #6 and tangentially related to issue #8 ; it might also just be closed with statement on the use case/spec compatibility of this wrapper with ZXing.

With ZXing, the default outputs of the raw stream are hex bytes while the parsed/text appears to defaul to just Java String (UTF-16). However, the python-zxing wrapper has these two lines in __init__.py/Barcode:

which force UTF-8 compatibility of the raw and parsed streams. This causes UnicodeDecodeError exceptions with any byte sequences that begin with bytes "larger" than b"\x7f" with which ZXing doesn't appear to have any problems. Just commenting out '.decode()' in each of these lines, I am able to reproduce ZXing results for byte data in both raw and parsed.

My question: is there a reason the '.decode()' or UTF-8 is even necessary for either raw or parsed or is the use case for this wrapper intended to be for UTF-8 compatible QR codes only?

When there is no result for a file, id est we have the standard output

file:///home/stefan/temp/image-001.png: No barcode found

then displaying the result will fail as BarCode.__repr__ does not like it:

Traceback (most recent call last):
  File "/home/stefan/temp/run.py", line 57, in <module>
    print(reader.decode(path))
  File "/home/stefan/temp/venv/lib/python3.9/site-packages/zxing/__init__.py", line 238, in __repr__
    self.__class__.__name__, self.raw, self.parsed, self.raw_bits.hex(),
AttributeError: 'NoneType' object has no attribute 'hex'

how to get rawByte from qr code? like from zxing decoder java

I am trying to use zxing to decode PDF417 images. However Im getting an error message as follows:

ValueError: Unknown format code 'x' for object of type 'str'

Error seems to be in the __repr__ of the BarCode Class

Here is the File i'm using

Can I understand if there is any workaround for the same?

Hello,

I have installed zxing through pip. this version is installed:

$zxing -V
zxing v1.0
using Java ZXing library version v3.5.1

I have different output running the command from ssh and from graphical....
If I run the command in gnome-terminal I get this output:

$zxing /alb0001.tiff 
/alb0001.tiff
=============
Traceback (most recent call last):
  File "/home/user/.local/bin/zxing", line 8, in <module>
    sys.exit(main())
  File "/home/user/.local/lib/python3.9/site-packages/zxing/__main__.py", line 59, in main
    if not bc:
UnboundLocalError: local variable 'bc' referenced before assignment

but running the same command from ssh on another server, or even running ssh in same server with 127.0.0.1 ( and even in the same gnome-terminal that was not working previously ) is working....

$ssh [email protected] 'zxing /alb0001.tiff'
[email protected]'s password: 
/alb0001.tiff
=============
  Decoded TEXT barcode in PDF_417 format.
  Raw text:    '1234|000'
  Parsed text: '1234|000'

Host is almalinux 9.

Is there anything I can do to get the command running from a graphical terminal?

Hello,

I'm running a simple test, trying to read an PDF417 bar code. I'm getting this error:

... zxing_init_.py", line 159, in parse
raw = raw[:-1].decode()
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb9 in position 171: invalid start byte

Here is my code:

import zxing
reader = zxing.BarCodeReader()
barcode = reader.decode("pdf417_bin.png", possible_formats=['PDF_417'], try_harder=True)
print(barcode)

And here is the image to decode:

I used the zxing online decoder https://zxing.org/w/decode.jspx and it works fine, so I want to know if I'm doing something wrong or it is a bug.

Thanks,

I tried installing the package using PEP 508 direct reference specifications in my setup.py:

install_requires=[ 'zxing @ [git+]https://github.com/dlenski/python-zxing/tarball/master', ]

and I get 2 exceptions:

subprocess.CalledProcessError: Command '['git', 'describe', '--tags', '--dirty=_dirty']' returned non-zero exit status 128.

FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\user\\AppData\\Local\\Temp\\pip-install-sjxlzlyf\\zxing\\zxing\\version.py'

The problem is here:

The try fails because the tarball does not contain a .git folder.
So in the exception you assume there is a local zxing/version.py file to read, but there isn't (because you have it in the .gitignore).

Possible solution: check if the file zxing/version.py exists or not

Installing zxing on Windows results in the following error:

❯ pip install .\python-zxing-1.0.2
Processing python-zxing-1.0.2
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [10 lines of output]
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "python-zxing-1.0.2\setup.py", line 49, in <module>
          long_description=open('README.md').read(),
                           ^^^^^^^^^^^^^^^^^^^^^^^^
        File "C:\Users\lemmarathon\scoop\apps\python\3.12.2\Lib\encodings\cp1252.py", line 23, in decode
          return codecs.charmap_decode(input,self.errors,decoding_table)[0]
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      UnicodeDecodeError: 'charmap' codec can't decode byte 0x8f in position 3118: character maps to <undefined>
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.