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reportlab - turns to Error running WSGI application

Hello,

i run an app in an virtualenv, installed reportlab via pip. Inside the app i want to create a pdf file.

I then reloaded the application and tried do create the pdf via my app, but i ran into the following error.

2020-11-28 16:50:35,564: Error running WSGI application
2020-11-28 16:50:35,572: SystemError: <built-in function uwsgi_sendfile> returned a result with an error set
2020-11-28 16:50:35,572:   File "/home/****/.virtualenvs/****venv/lib/python3.8/site-packages/django/core/handlers/wsgi.py", line 148, in __call__
2020-11-28 16:50:35,573:     response = environ['wsgi.file_wrapper'](response.file_to_stream, response.block_size)

All other sides and functions are working as expected. Only the pdf file is not created.

[edit by admin: formatting]

deleted-user-8947765 | 4 posts | Nov. 28, 2020, 4:54 p.m. | permalink

Could you give the full traceback of the error?

Staff giles | 12096 posts | PythonAnywhere staff | Nov. 28, 2020, 6:33 p.m. | permalink

Thats all what is logged in the server error log

2020-11-28 21:19:55,883: Error running WSGI application
2020-11-28 21:19:55,888: SystemError: <built-in function uwsgi_sendfile> returned a result with an error set
2020-11-28 21:19:55,888:   File "/home/BloodPressureOnline/.virtualenvs/bloodpressurevenv/lib/python3.8/site-packages/django/core/handlers/wsgi.py", line 148, in __call__
2020-11-28 21:19:55,888:     response = environ['wsgi.file_wrapper'](response.file_to_stream, response.block_size)
2020-11-28 21:19:56,350: Not Found: /favicon.ico
deleted-user-8947765 | 4 posts | Nov. 28, 2020, 8:28 p.m. | permalink

That's odd, I would have expected more. What code do you have in your view function?

Staff giles | 12096 posts | PythonAnywhere staff | Nov. 29, 2020, 4:06 p.m. | permalink

Thats the view for the pdf

@login_required
def evaluationprint(request):

    buffer = io.BytesIO()
    pdf = canvas.Canvas(buffer)
    pdf.drawString(100, 100, "Test")

    pdf.showPage()
    pdf.save()

    buffer.seek(0)
    return FileResponse(buffer, as_attachment=False, filename='Auswertung.pdf')
deleted-user-8947765 | 4 posts | Nov. 30, 2020, 6:30 p.m. | permalink

Have a look at this forum post where the issue and the solution are discussed.

Staff glenn | 9718 posts | PythonAnywhere staff | Dec. 1, 2020, 10:43 a.m. | permalink

Thanks, problem solved

deleted-user-8947765 | 4 posts | Dec. 5, 2020, 9:43 p.m. | permalink