I apologize in advance if this is excessive; I'm trying to provide all relevant information ahead of time, rather than making you guys have to ask me questions.

I'm running Gentoo Linux on AMD64, with both "cairo" and "pycairo" at 1.8.10.

When attempting to use pycairo functions from wxPython, I get the following error:


adam@adamc: $ ./cairotest.py
Traceback (most recent call last):
  File "./cairotest.py", line 26, in OnPaint
    cr = wx.lib.wxcairo.ContextFromDC(dc)
  File "/usr/lib64/python2.6/site-packages/wx-2.8-gtk2-unicode/wx/lib/wxcairo.py", line 121, in ContextFromDC
    ctx = pycairoAPI.Context_FromContext(ctxptr, pycairoAPI.Context_Type, None)
AttributeError: 'Pycairo_CAPI' object has no attribute 'Context_FromContext'


I did some digging, and it looks like the _fields_ value in wxcairo.py there isn't getting populated because pycairo's version_info string is reporting (1, 10, 8) instead of (1, 8, 10). Here's the pdb output that led me to that conclusion:


AttributeError: 'Pycairo_CAPI' object has no attribute 'Context_FromContext'
> /usr/lib64/python2.6/site-packages/wx-2.8-gtk2-unicode/wx/lib/wxcairo.py(121)ContextFromDC()
    120         # Turn it into a pycairo context object
--> 121         ctx = pycairoAPI.Context_FromContext(ctxptr, pycairoAPI.Context_Type, None)
    122

ipdb> cairo.version
'1.8.10'
ipdb> cairo.version_info
(1, 10, 8)
ipdb>


I dug into the autoconf script that builds pycairo on my system, and it looks like the information is getting into the correct fields. Here's some of <build>/src/config.h:


/* Define to the full name and version of this package. */
#define PACKAGE_STRING "pycairo 1.8.10"

/* Define to the one symbol short name of this package. */
#define PACKAGE_TARNAME "pycairo"

/* Define to the version of this package. */
#define PACKAGE_VERSION "1.8.10"

/* pycairo major version */
#define PYCAIRO_VERSION_MAJOR 1

/* pycairo macro version */
#define PYCAIRO_VERSION_MICRO 10

/* pycairo minor version */
#define PYCAIRO_VERSION_MINOR 8

/* Define to 1 if you have the ANSI C header files. */
#define STDC_HEADERS 1

/* Version number of package */
#define VERSION "1.8.10"


Unfortunately, I don't know Python well enough to dig any further. It looks like the values are being added in the right order in <build>/src/cairomodule.c, so I don't know why I get them in the wrong order out of the compiled, installed library.

If I change wxcairo.py to look for "cairo.version_info < (1,11)" (instead of 1,9 like it is now), then everything seems to work fine. That's the workaround I'm going to use, but hopefully this report will be useful.

Thanks,
Adam