There is an annoying bug when using wxAgg backend with wxPython 2.8 on
Windows. Whenever matplotlib is imported, we get a modal message box
displaying the error message:
"This application has failed to start because wxmsw26uh_vc.dll was not
found. Reinstalling the application may fix this problem."
After clicking OK, everything works fine.
Here is a bugfix:
_wxagg.pyd has a dependency on a unicode version of a "hybrid" (i.e.
debug) wxWidgets library, wxmsw26uh_vc.dll. I verified this using MSVC
dumpbin utility. No users of wxPython 2.8 will have this dll installed.
At the bottom of the file backends_wxagg.py, there is an import
statement for _wxagg.pyd:
try:
import _wxagg
except ImportError:
_wxagg = None
Obviously this import always fails on wxPython 2.8, and is the cause of
the redundant error message. _wxagg.pyd is not needed with wxPython 2.8,
so the import should not be attempted at all. Python will trap the
ImportError exception, but a redundant error message is displayed.
Instead, it should read like this:
if getattr(wx, '__version__', '0.0')[0:3] < '2.8':
try:
import _wxagg # C++ accelerator with wxPython 2.6
except ImportError:
_wxagg = None # default to pure Python
else: # wxPython 2.8, no accelerator needed
_wxagg = None
On wxPython 2.6, the C++ accelerator in _wxagg.pyd will not be used
unless _wxagg.pyd is linked against the xwWidgets library actually
present, and Python will default to Python code instead. Fixing these
issues on wxpython 2.6 thus require a rebuild of _wxagg.pyd that links
it with the wx library present on the system.
If all you need is to get rid of the error message, just comment out the
import statement and set the global variable _wxagg to None.
Regards,
Sturla Molden
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