使用reportlab和生成的二维码图像生成pdf时解决IOError
Solving IOError while generating a pdf using reportlab and generated qr code image
我正在尝试从文本生成二维码，然后插入到报告实验室 pdf 中。
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}')
我得到以下输出：
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']
从报错来看，好像是获取图片文件名的时候出错了。但是没有文件。正在从 BytesIO 生成图像。
您没有向我们展示的 generate_qr_code 函数没有返回 BytesIO 对象。它返回 PNG 图像的原始字节。当你print(img, type(img))，它告诉你它是“字节”类型，对吧？那是一串字节，而不是 BytesIO 对象。如果将这些字节包装到 BytesIO 对象中，则 reportlab Image 构造函数将能够处理它。
我正在尝试从文本生成二维码，然后插入到报告实验室 pdf 中。
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}')
我得到以下输出：
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']
从报错来看，好像是获取图片文件名的时候出错了。但是没有文件。正在从 BytesIO 生成图像。
您没有向我们展示的 generate_qr_code 函数没有返回 BytesIO 对象。它返回 PNG 图像的原始字节。当你print(img, type(img))，它告诉你它是“字节”类型，对吧？那是一串字节，而不是 BytesIO 对象。如果将这些字节包装到 BytesIO 对象中，则 reportlab Image 构造函数将能够处理它。