Hi,
I am developing apps which are heavily depending on the creation of
pdf-files. This workes great using fpfdf and python2.7. I try to go on and
moving to pyhton3.7 which is, so far no problem. The real challenge for me
is to generate correct pdf-files:
Heres how I did it in python2.7:
@service.run
def generatePDF(**kwargs):
from gluon.contrib.fpdf import fpdf
from gluon.contrib.fpdf.php import UTF8ToUTF16BE, UTF8StringToArray
from gluon.contenttype import contenttype
pdf = fpdf.FPDF("P","mm","a4")
pdf.l_margin, pdf.r_margin = 20, 10
pdf.add_font('Sans', '', 'DejaVuSansCondensed.ttf', uni=True)
pdf.add_font('Sans', 'B', 'DejaVuSansCondensed-Bold.ttf', uni=True)
pdf.add_font('Sans', 'I', 'DejaVuSansCondensed-Oblique.ttf', uni=True)
pdf.add_font('Sans', 'BI', 'DejaVuSansCondensed-BoldOblique.ttf', uni=
True)
pdf.add_font('Serif', '', 'DejaVuSerifCondensed.ttf', uni=True)
pdf.add_font('Serif', 'B', 'DejaVuSerifCondensed-Bold.ttf', uni=True)
pdf.add_font('Serif', 'I', 'DejaVuSerifCondensed-Italic.ttf', uni=True)
pdf.add_font('Serif', 'BI', 'DejaVuSerifCondensed-BoldItalic.ttf', uni=
True)
pdf.add_page()
pdf.set_font('Sans','B',20)
pdf.set_y( 25 )
pdf.cell( w=pdf.w-(pdf.l_margin+pdf.r_margin), h=25,
align="C",
border=1,
txt="Hello World", ln=2 )
response.headers["Content-Type"]=contenttype(".pdf")
response.headers['Content-disposition'] = 'attachment;
filename=mypdf.pdf'
return pdf.output(dest='S')
The downloaded file is a PDF, the file itself is latin1 encoded. (checked
with vim; set fileencoding)
If I do the very same, using web2py and python3.7, I am getting the
pdf-file as byte-stream - starting with the b'
b'%PDF-1.3\n3 0 obj\n<</Type /Page\n/Parent 1 0 R ...
fileencoding utf-8, which I understand (somehow) since the fpdf does serve
a byte-stream.
To overcome this, I tried to change the last line to:
return pdf.output(dest='S').decode('latin1')
and I get a file which is no valid pdf, fileencoding is utf-8
Once I manually change the fileencoding of the downloaded file to latin1,
it becomes a valid and readable pdf-file.
Using
pdf.output("myfile.pdf",dest='F')
does produce a valid, latin1 - encoded file on disc however.
I tried different variants as well, but I got stuck and was not able to
produce a valid pdf.
Can someone suggest a way to produce a valid download?
At first I was suspecting some missing response - header information, but I
did not find one which solved the problems.
Any help would be appreciated!
I am working on macOS, using Safari, but tried Firefox and Chrome as well -
same result.
Cheers, Armin
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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