Re: trouble swigging a library

Try to call your .so file _hid.so so that "import hid" will actually
load hid.py (this one has an init function) which will then load
_hid.so.

On Mon, 2004-05-24 at 16:15, Martin F Krafft wrote:
> Hi all, 
> 
> I would like to use Swig to make a Python wrapper to a library
> I wrote in C. The library is installed in /usr/lib and works fine
> with C. It's an access library for USB HID devices without requiring
> kernel support. Now I need to use it from Python...
> 
> I thus created a .i file for the API and compiled it:
> 
>   swig -python hid.i
> 
>   cc -fpic -I/usr/include/python2.3/ -I../include \
>     -DHID_INTERNAL -c -o hid_wrap.o hid_wrap.c
> 
> No errors.
> 
> I then linked it:
> 
>   ld -shared -lusb -lhid hid_wrap.o -o hid.so
> 
> Also, no errors.
> 
> Now I fire up python and try to import the module, but that fails:
> 
>   Traceback (most recent call last):
>     File "./startup.py", line 3, in ?
>       from hid.so import *
>   ImportError: dynamic module does not define init function (inithid)
> 
> It seems that everything compiled fine though:
> 
>   $ ldd hid.so
>         libusb-0.1.so.4 => /usr/lib/libusb-0.1.so.4 (0x40010000)
>         libhid.so.0 => /usr/lib/libhid.so.0 (0x40019000)
>         libc.so.6 => /lib/tls/libc.so.6 (0x40026000)
>         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
> 
> What am I doing wrong?
> 
> Thanks for any help!
> 
> If you want to download the library in question:
> 
>   cvs -d :pserver:anoncvs@xxxxxxxxxxxx:/home/cvs/external login
>   [empty password]
>   cvs -z3 -d :pserver:anoncvs@xxxxxxxxxxxx:/home/cvs/external co libhid
> 
> You can find ./swig in there...
-- 
Anton Deguet                          Systems Engineer
ERC CISST                     Johns Hopkins University
http://cisstweb.cs.jhu.edu                410 516 5261


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