[英]Solving IOError while generating a pdf using reportlab and generated qr code image
I am trying to generate a qr code from text, and then insert into a reportlab pdf.我正在尝试从文本中生成二维码,然后插入到 reportlab pdf 中。
My code:我的代码:
def qr_code_as_image(text):
from io import BytesIO
print("In show_qr")
img = generate_qr_code(text)
print(img, type(img))
i = Image(img)
print(i, type(i))
return i
def add_patient_header_with_qr(self):
line1 = ("Name", self.linkedcustomer.name,
"Age", self.linkedcustomer.age())
line2 = ("MRD No.", self.linkedcustomer.cstid,
"Date", self.prescription_time)
line3 = ("No.", "#", "Doctor", self.doc.name)
datatb = [line1, line2, line3]
patientdetailstable = Table(datatb)
patientdetailstable.setStyle(self.patientdetails_style)
col1 = patientdetailstable
checkin_url = reverse('clinicemr', args=[self.checkin.checkinno])
qr_image = qr_code_as_image(checkin_url)
qr_image.hAlign = 'LEFT'
col2 = Table([[qr_image]])
tblrow1 = Table([[col1, col2]], colWidths=None)
tblrow1.setStyle(self.table_left_top_align)
self.elements.append(tblrow1)
def final_generate(self, footer_content, action=None):
with NamedTemporaryFile(mode='w+b') as temp:
from django.http import FileResponse, Http404
from functools import partial
# use the temp file
cmd = "cat " + str(temp.name)
print(os.system(cmd))
print(footer_content, type(footer_content))
doc = SimpleDocTemplate(
temp.name,
pagesize=A4,
rightMargin=20,
leftMargin=20,
topMargin=20,
bottomMargin=80,
allowSplitting=1,
title="Prescription",
author="System.com")
frame = Frame(doc.leftMargin, doc.bottomMargin, doc.width, doc.height,
id='normal')
template = PageTemplate(
id='test',
frames=frame,
onPage=partial(footer, content=footer_content)
)
doc.addPageTemplates([template])
doc.build(self.elements,
onFirstPage=partial(footer, content=footer_content),
onLaterPages=partial(footer, content=footer_content)
)
print(f'Generated {temp.name}')
I get the following output:我得到以下 output:
2020-11-29 13: 06: 33, 915 django.request ERROR Internal Server Error: / clinic/presc/k-0NGpApcg
Traceback(most recent call last):
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/lib/utils.py", line 655, in open_for_read
return open_for_read_by_name(name, mode)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/lib/utils.py", line 599, in open_for_read_by_name
return open(name, mode)
ValueError: embedded null byte
During handling of the above exception, another exception occurred:
Traceback(most recent call last):
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/lib/utils.py", line 658, in open_for_read
return getBytesIO(datareader(name) if name[:5].lower() == 'data:' else urlopen(name).read())
File "/usr/lib/python3.6/urllib/request.py", line 223, in urlopen
return opener.open(url, data, timeout)
File "/usr/lib/python3.6/urllib/request.py", line 517, in open
req.timeout = timeout
AttributeError: 'bytes' object has no attribute 'timeout'
During handling of the above exception, another exception occurred:
Traceback(most recent call last):
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/joel/myappointments/clinic/views.py", line 6879, in GoGetPrescription
clinicobj = clinicobj,
File "/home/joel/myappointments/clinic/views.py", line 16222, in PDFPrescriptions
return prescription.generate_pdf(action=action, rating=True)
File "/home/joel/myappointments/clinic/views.py", line 15415, in generate_pdf
return self.final_generate(footer_content, action=action)
File "/home/joel/myappointments/clinic/views.py", line 15447, in final_generate
onLaterPages = partial(footer, content=footer_content)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/doctemplate.py", line 1291, in build
BaseDocTemplate.build(self, flowables, canvasmaker=canvasmaker)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/doctemplate.py", line 1056, in build
self.handle_flowable(flowables)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/doctemplate.py", line 912, in handle_flowable
if frame.add(f, canv, trySplit=self.allowSplitting):
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/frames.py", line 174, in _add
w, h = flowable.wrap(aW, h)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/tables.py", line 1206, in wrap
self._calc(availWidth, availHeight)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/tables.py", line 641, in _calc
W = self._calcPreliminaryWidths(availWidth) # widths
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/tables.py", line 754, in _calcPreliminaryWidths
new = elementWidth(value, style) or 0
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/tables.py", line 518, in _elementWidth
w = v.minWidth() # should be all flowables
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/tables.py", line 873, in minWidth
style.leftPadding+style.rightPadding)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/tables.py", line 512, in _elementWidth
if hasattr(v, 'drawWidth') and isinstance(v.drawWidth, (int, float)): return v.drawWidth
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/flowables.py", line 494, in __getattr__
self._setup_inner()
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/flowables.py", line 455, in _setup_inner
img=self._img
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/platypus/flowables.py", line 488, in __getattr__
self._img=ImageReader(self._file)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/lib/utils.py", line 813, in __init__
annotateException('\nfileName=%r identity=%s' %
(fileName, self.identity()))
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/lib/utils.py", line 1394, in annotateException
rl_reraise(t, v, b)
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/lib/utils.py", line 147, in rl_reraise
raise v
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/lib/utils.py", line 777, in __init__
self.fp=open_for_read(fileName, 'b')
File "/home/joel/myappointments/venv/lib/python3.6/site-packages/reportlab/lib/utils.py", line 660, in open_for_read
raise IOError('Cannot open resource "%s"' % name)
OSError: Cannot open resource "b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\xd2\x00\x00\x00\xd2\x01\x00\x00\x00\x00\x17\xe2\xa3\xef\x00\x00\x01$IDATx\x9c\xed\x98An\xc4 \x10\x04k\x16\xdf\xf1\x8f\xe0gyS~\x80\x9f\x92\x1f\xe0;\xab\xde\x03\xc6\xeb\x1c"\xe5d\xd0\xda\x1c\xd0 @\xcbRk4\x9e\xee\x01\xb6\xe5$\xa9 \xe5v\xc3\x83\xbf\xd7\xe7cA\x92\x94\xc1"N\x16k\x86\xa4\xd1x\x9e\x8bA\xc8@\xc8NJ\xbe e\'\xc0]</\x07\xccb\xdb\xfas\xe9\x8eM\xefP\xac\x13b\xed\xc6e0\xccKJ\x80\xd9\xecd\x11\x90T\xfap\x19\x06\xdb\x97\x13!;\xd5v\xd3\x87\xcbH\xd8\xa4=\x14\xeb\xd3\xc0\xb7\x9be$\x9e\x9d\xea\xa5V\x89/u\xab\xca\x94F\xe2yz^\x94\xbc\x04^\xda\x8ePe{,\x9e}\xeaE\xe9\xed\xe6\xe0\xae\x17\xa0\xa6#\xf9\xb2\x9b;\xe9\x1f\xdf}:\xc6A\x80v=\xbau\xba\xd5\xcb\xef_hk7#\xf1\xec\xee_\xf0\x92\x94\x9d.\xde_\xda<\xdd\xde\x19R\xb5\xbfW\xcf\xcb\x03V3\x8b\xb4\x911\xfc\x98\xd9\xd7\xe5\xfb\xcb\x11[f\'\x96\x19\x80\xa7\x8d\xcb\xf3\x0c\xec0O\x13\xbe\xa7b\xf8\x0c\x8b\xdd\xben\xef/\xc0\xf68\xb5E#\xf1\xec\xaaGU\xac\x9d\x08\xba\xba\xdf}\x01<\xf7\xbf\x8cN\xed-\x8a\x00\x00\x00\x00IEND\xaeB`\x82'"
fileName=b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\xd2\x00\x00\x00\xd2\x01\x00\x00\x00\x00\x17\xe2\xa3\xef\x00\x00\x01$IDATx\x9c\xed\x98An\xc4 \x10\x04k\x16\xdf\xf1\x8f\xe0gyS~\x80\x9f\x92\x1f\xe0;\xab\xde\x03\xc6\xeb\x1c"\xe5d\xd0\xda\x1c\xd0@\xcbRk4\x9e\xee\x01\xb6\xe5$\xa9 \xe5v\xc3\x83\xbf\xd7\xe7cA\x92\x94\xc1"N\x16k\x86\xa4\xd1x\x9e\x8bA\xc8@\xc8NJ\xbe e\'\xc0]</\x07\xccb\xdb\xfas\xe9\x8eM\xefP\xac\x13b\xed\xc6e0\xccKJ\x80\xd9\xecd\x11\x90T\xfap\x19\x06\xdb\x97\x13!;\xd5v\xd3\x87\xcbH\xd8\xa4=\x14\xeb\xd3\xc0\xb7\x9be$\x9e\x9d\xea\xa5V\x89/u\xab\xca\x94F\xe2yz^\x94\xbc\x04^\xda\x8ePe{,\x9e}\xeaE\xe9\xed\xe6\xe0\xae\x17\xa0\xa6#\xf9\xb2\x9b;\xe9\x1f\xdf}:\xc6A\x80v=\xbau\xba\xd5\xcb\xef_hk7#\xf1\xec\xee_\xf0\x92\x94\x9d.\xde_\xda<\xdd\xde\x19R\xb5\xbfW\xcf\xcb\x03V3\x8b\xb4\x911\xfc\x98\xd9\xd7\xe5\xfb\xcb\x11[f\'\x96\x19\x80\xa7\x8d\xcb\xf3\x0c\xec0O\x13\xbe\xa7b\xf8\x0c\x8b\xdd\xben\xef/\xc0\xf68\xb5E#\xf1\xec\xaaGU\xac\x9d\x08\xba\xba\xdf}\x01<\xf7\xbf\x8cN\xed-\x8a\x00\x00\x00\x00IEND\xaeB`\x82' identity=[ImageReader@0x7f1e0987ecf8 filename=b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\xd2\x00\x00\x00\xd2\x01\x00\x00\x00\x00\x17\xe2\xa3\xef\x00\x00\x01$IDATx\x9c\xed\x98An\xc4 \x10\x04k\x16\xdf\xf1\x8f\xe0gyS~\x80\x9f\x92\x1f\xe0;\xab\xde\x03\xc6\xeb\x1c"\xe5d\xd0\xda\x1c\xd0@\xcbRk4\x9e\xee\x01\xb6\xe5$\xa9 \xe5v\xc3\x83\xbf\xd7\xe7cA\x92\x94\xc1"N\x16k\x86\xa4\xd1x\x9e\x8bA\xc8@\xc8NJ\xbe e\'\xc0]</\x07\xccb\xdb\xfas\xe9\x8eM\xefP\xac\x13b\xed\xc6e0\xccKJ\x80\xd9\xecd\x11\x90T\xfap\x19\x06\xdb\x97\x13!;\xd5v\xd3\x87\xcbH\xd8\xa4=\x14\xeb\xd3\xc0\xb7\x9be$\x9e\x9d\xea\xa5V\x89/u\xab\xca\x94F\xe2yz^\x94\xbc\x04^\xda\x8ePe{,\x9e}\xeaE\xe9\xed\xe6\xe0\xae\x17\xa0\xa6#\xf9\xb2\x9b;\xe9\x1f\xdf}:\xc6A\x80v=\xbau\xba\xd5\xcb\xef_hk7#\xf1\xec\xee_\xf0\x92\x94\x9d.\xde_\xda<\xdd\xde\x19R\xb5\xbfW\xcf\xcb\x03V3\x8b\xb4\x911\xfc\x98\xd9\xd7\xe5\xfb\xcb\x11[f\'\x96\x19\x80\xa7\x8d\xcb\xf3\x0c\xec0O\x13\xbe\xa7b\xf8\x0c\x8b\xdd\xben\xef/\xc0\xf68\xb5E#\xf1\xec\xaaGU\xac\x9d\x08\xba\xba\xdf}\x01<\xf7\xbf\x8cN\xed-\x8a\x00\x00\x00\x00IEND\xaeB`\x82']
From the error, it appears that it is erroring out on getting the name of the image file.从错误中,它似乎在获取图像文件的名称时出错。 But there is no file.
但是没有文件。 The image is being generated from BytesIO.
图像是从 BytesIO 生成的。
Your generate_qr_code
function, which you did not show us, is NOT returning a BytesIO object.您没有向我们展示的
generate_qr_code
function 没有返回 BytesIO object。 It's returning the raw bytes of the PNG image.它返回 PNG 图像的原始字节。 When you
print(img, type(img))
, it told you it was of type "bytes", right?当您
print(img, type(img))
时,它告诉您它是“字节”类型,对吗? That's a string of bytes, not a BytesIO object.那是一串字节,而不是 BytesIO object。 If you wrap those bytes into a BytesIO object, then the reportlab
Image
constructor will be able to handle it.如果您将这些字节包装到 BytesIO object 中,那么 reportlab
Image
构造函数将能够处理它。
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