IOError: [Errno cairo returned CAIRO_STATUS_WRITE_ERROR: error while writing to output stream] 11

[tooh]

Environment

OSX Yosemite
System python 2.7

I'm completely new to the use of cairo. I have a case for converting svg files to png.

I found cairosvg as a suitable tool for this.

I had a lot of problems in installing cairo/py2cairo so at the end I decided to use cairocffi.

cairosvg test.svg -o test.png

Traceback (most recent call last):
  File "/usr/local/bin/cairosvg", line 25, in <module>
    cairosvg.main()
  File "/Library/Python/2.7/site-packages/cairosvg/__init__.py", line 92, in main
    SURFACES[output_format.upper()].convert(**kwargs)
  File "/Library/Python/2.7/site-packages/cairosvg/surface/__init__.py", line 87, in convert
    cls(tree, output, dpi).finish()
  File "/Library/Python/2.7/site-packages/cairosvg/surface/__init__.py", line 421, in finish
    self.cairo.write_to_png(self.output)
  File "/Library/Python/2.7/site-packages/cairocffi/surfaces.py", line 597, in write_to_png
    self._pointer, _encode_filename(target)))
  File "/Library/Python/2.7/site-packages/cairocffi/__init__.py", line 69, in _check_status
    raise exception(message, status)
IOError: [Errno cairo returned CAIRO_STATUS_WRITE_ERROR: error while writing to output stream] 11

[SimonSapin]

@tooh Does the script have filesystem permissions to create test.png in that current directory? What happens when you run python -c 'open("test.png", "w").close()'?

@liZe, any other idea what this could be?

[tooh]

Can write file

==> ls *.png
test.png

[SimonSapin]

Ok… let’s try a smaller test case:

import cairocffi
cairocffi.ImageSurface(cairocffi.FORMAT_ARGB32, 100, 100).write_to_png('test.png')

[tooh]

file test.png written

[SimonSapin]

It looks like finding the root cause will unfortunately require non-trivial debugging :/ I can’t do it through github like we’ve done so far.

[liZe]

No idea. Could you try to use an absolute path? (something like cairosvg test.svg -o /tmp/test.png)

[tooh]

Same result

[mkv123]

I had the exact same problem (or at least the same error message) but for what ever reason adding viewBox="0 0 800 800" to the svg element fixed it for me.

Minimal failing case:
<svg baseProfile="full" height="100%" version="1.1" width="100%" xmlns="http://www.w3.org/2000/svg"> <circle cx="50" cy="50" r="40" /> </svg>

Minimal working version:
`

``

[SimonSapin]

@mkv123 Is this with CairoSVG?

[mkv123]

Yes. Here's a run with the failing case:

$ cairosvg test.svg -f PNG> test.png
Traceback (most recent call last):
  File "/usr/local/bin/cairosvg", line 25, in <module>
    cairosvg.main()
  File "/usr/local/lib/python2.7/site-packages/cairosvg/__init__.py", line 93, in main
    SURFACES[output_format.upper()].convert(**kwargs)
  File "/usr/local/lib/python2.7/site-packages/cairosvg/surface/__init__.py", line 87, in convert
    cls(tree, output, dpi).finish()
  File "/usr/local/lib/python2.7/site-packages/cairosvg/surface/__init__.py", line 421, in finish
    self.cairo.write_to_png(self.output)
  File "/usr/local/lib/python2.7/site-packages/cairocffi/surfaces.py", line 594, in write_to_png
    self._pointer, write_func, ffi.NULL))
  File "/usr/local/lib/python2.7/site-packages/cairocffi/__init__.py", line 69, in _check_status
    raise exception(message, status)
IOError: [Errno cairo returned CAIRO_STATUS_WRITE_ERROR: error while writing to output stream] 11

[liZe]

The error is not really explicit in cairocffi, but CairoSVG is the culprit here. If you don't want to check for unusual strange cases (surface with a 0×0 size for example), you can safely close this bug.

[kogcyc]

Thanks, mkv123!

Adding the viewbox fixed me too.