py2exe: problem including libxml2

[Thomas Heller]

"Brad Clements" <bkc at Murkworks.com> writes:

> "Rene Olsthoorn" <rol at post.com> wrote in message
> news:3fcf581e$0$200$e4fe514c at news.xs4all.nl...
>> Dear readers,
>>
>> py2exe has a problem including libxml2. Not at building time, but at
>> runtime. The libxml2.dll cannot be loaded... Is there anyone that NOT has
>> the problem? (and can you drop me your setup.py scipt, please).
>>
>
> Perhaps you hit the same problem I did when using libxml2 and libxslt in a
> service created by p2exe.
>
> Here are notes from my project diary (these notes are meant for my client to
> reconcile my bill vs. what I did)
> -----
> The service builds, I can install it, but get an error when I run it:
>
>           The instance's SvcRun() method failed
>           File "win32serviceutil.pyo", line 663, in SvcRun
>           File "UMXWIN32SVC.pyo", line 41, in SvcDoRun
>           File "Rose\WebServer\UMXMServer.pyo", line 53, in ?
>           File "Rose\WebServer\umx_handler.pyo", line 16, in ?
>           File "Rose\WebServer\HTTPHandler.pyo", line 95, in ?
>           File "Rose\WebServer\XMLProcessor.pyo", line 34, in ?
>
>           exceptions.ImportError: dynamic module does not define init
> function (initlibxslt)
>
> This says that the service cannot import the libxslt module for some reason.
>
> I built a test script that py2exe runs in console mode, it also fails in the
> same way.
>
> I think libxml is using some kind of dynamic import mechanism, we need to
> work around.
>
> Aha, figured it out. example problem with libxml2.
>
> libxml2.py is a module that imports libxml2mod.pyd which imports libxml2.dll
>
> But, py2exe creates a default path like this:
>
>          c:\\temp\\rose, c:\\temp\\rose\\library.zip
>
> This means that python tries to import from the directory first, before
> importing from library.zip. So, python imports libxml2.dll, not libxml2.py
>
> My workaround is to reverse the order of the imports in the startup script:
>
>        zipfile = sys.path[-1]
>        sys.path.insert(0,zipfile)

Which version of py2exe are you using, and what is this libxml2?

IIRC, in the latest version py2exe doesn't put the executable's
directory on the path anymore, but file names like libxml2.py,
libxml2.pyd, and libxml2.dll all at the same time have the potential to
confuse it!

Thomas