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
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
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
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 >> >> ------------------------------------------------------------------------------ >> RSA(R) Conference 2012 >> Mar 27 - Feb 2 >> Save 400ドル by Jan. 27 >> Register now! >> http://p.sf.net/sfu/rsa-sfdev2dev2 >> _______________________________________________ >> Matplotlib-devel mailing list >> Mat...@li... >> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel > >
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 >>> >>> ------------------------------------------------------------------------------ >>> RSA(R) Conference 2012 >>> Mar 27 - Feb 2 >>> Save 400ドル by Jan. 27 >>> Register now! >>> http://p.sf.net/sfu/rsa-sfdev2dev2 >>> _______________________________________________ >>> Matplotlib-devel mailing list >>> Mat...@li... >>> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel >> > > ------------------------------------------------------------------------------ > Keep Your Developer Skills Current with LearnDevNow! > The most comprehensive online learning library for Microsoft developers > is just 99ドル.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > Matplotlib-devel mailing list > Mat...@li... > https://lists.sourceforge.net/lists/listinfo/matplotlib-devel -- Michael Droettboom Science Software Branch Space Telescope Science Institute Baltimore, Maryland, USA