Re: [matplotlib-devel] imread() in master branch doesn't work

Ah.  That explains why I couldn't reproduce it -- I didn't realize the 
issue had already been closed.

Mike

On 01/17/2012 12:53 PM, Eric Firing wrote:
> Mike,
>
> Git bisect showed that the problem was your merge commit bca1fb0; you
> were merging a changeset relative to a very old version, and I'm pretty
> sure that you accidentally kept the old version of a line.  I switched
> it back to the new version:
>
> https://github.com/matplotlib/matplotlib/commit/c9cefdcf50742fd041636b20aa48d3a821d3299d
>
> Maybe your suggested patch below is still a good idea, but I think that
> is now an independent question.
>
> Eric
>
>
> On 01/17/2012 05:37 AM, Michael Droettboom wrote:
>> I can't confirm this on RHEL5 64-bit or Fedora 16 64-bit.
>>
>> Have you tried removing the build and installed directories and
>> rebuilding from scratch?
>>
>> I'm shooting in the dark, but does the attached patch resolve your issue?
>>
>> diff --git a/src/_png.cpp b/src/_png.cpp
>> index 9437c87..c17dec9 100644
>> --- a/src/_png.cpp
>> +++ b/src/_png.cpp
>> @@ -553,7 +553,7 @@ _png_module::_read_png(const Py::Object&   py_fileobj,
>> const b
>>
>>         if (PyErr_Occurred()) {
>>             Py_DECREF((PyObject *)A);
>> -        return NULL;
>> +        throw Py::Exception();
>>         } else {
>>             return (PyObject *)A;
>>
>> Mike
>>
>> On 01/14/2012 04:51 PM, Eric Firing wrote:
>>> On 01/14/2012 09:02 AM, Benjamin Root wrote:
>>>> Tried using plt.imread() today on a PNG file, and I am getting this
>>>> PyCXX error:
>>>>
>>>> Traceback (most recent call last):
>>>>       File "<stdin>", line 1, in<module>
>>>>       File "/home/ben/Programs/matplotlib/lib/matplotlib/pyplot.py", line
>>>> 1746, in imread
>>>>         return _imread(*args, **kwargs)
>>>>       File "/home/ben/Programs/matplotlib/lib/matplotlib/image.py", line
>>>> 1218, in imread
>>>>         return handler(fd)
>>>> TypeError: PyCXX: Error creating object of type N2Py6ObjectE from (nil)
>>>>
>>>> Using master branch on Python 2.7 on 32-bit Ubuntu Oneric.  Seems to
>>>> happen to both color and b&w images.  scipy.ndimage.imread() still works
>>>> fine, though.
>>>>
>>>> Ben Root
>>> I get the same thing with master on 64-bit ubuntu natty, but not with
>>> v1.1.x.  Mike did quite a bit of work on src/_png.cpp between those two.
>>>      The most recent commit to that file is not causing the problem, but I
>>> have not tracked it down beyond that.
>>>
>>> Eric
>>>
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-- 
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA