Re: [Numpy-discussion] New to ctypes. Some problems with loading shared library.

2008-02-05 Thread Ryan May 
Lou Pecora wrote:
 I got ctypes installed and passing its own tests.  But
 I cannot get the shared library to load.  I am using
 Mac OS X 10.4.11, Python 2.4 running through the
 Terminal.
 
 I am using Albert Strasheim's example on
 http://scipy.org/Cookbook/Ctypes2 except that I had to
 remove the defined 'extern' for FOO_API since the gcc
 compiler complained about two 'externs' (I don't
 really understand what the extern does here anyway). 
 
 My make file for generating the library is simple,
 
 #  Link ---
 test1ctypes.so:  test1ctypes.o  test1ctypes.mak
   gcc -bundle -flat_namespace -undefined suppress -o
 test1ctypes.so  test1ctypes.o
 
 #  gcc C compile --
 test1ctypes.o:  test1ctypes.c test1ctypes.h
 test1ctypes.mak
   gcc -c test1ctypes.c -o test1ctypes.o
 
 This generates the file test1ctypes.so.  But when I
 try to load it
 
 import numpy as N
 import ctypes as C
 
 _test1 = N.ctypeslib.load_library('test1ctypes', '.')
 
 I get the error message,
 
 OSError: dlopen(/Users/loupecora/test1ctypes.dylib,
 6): image not found
 
 I've been googling for two hours trying to find the
 problem or other examples that would give me a clue,
 but no luck.  
 
 Any ideas what I'm doing wrong?  Thanks for any clues.
 
Well, it's looking for test1ctypes.dylib, which I guess is a MacOSX
shared library?  Meanwhile, you made a test1ctypes.so, which is why it
can't find it.  You could try using this instead:

_test1 = N.ctypeslib.load_library('test1ctypes.so', '.')

or try to get gcc to make a test1ctypes.dylib.

Ryan

-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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Re: [Numpy-discussion] New to ctypes. Some problems with loading shared library.

2008-02-05 Thread Lou Pecora 


 Well, it's looking for test1ctypes.dylib, which I
 guess is a MacOSX
 shared library?  Meanwhile, you made a
 test1ctypes.so, which is why it
 can't find it.  You could try using this instead:
 
 _test1 = N.ctypeslib.load_library('test1ctypes.so',
 '.')
 
 or try to get gcc to make a test1ctypes.dylib.
 
 Ryan
 

Thanks, Ryan.  You were on the right track.  I changed
the name of the file in the load_library call to
test1ctypes.so and I had to put in the full path to
the file as the second argument.  The default path was
to my home directory.  I could probably change paths
with a python os call, too.  

Anyway, IT WORKED!  How 'bout that?  One simple
example down and now on to more complex things.

Thanks, again.




-- Lou Pecora,   my views are my own.


  

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