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Groups > comp.lang.python > #45052

Re: Help with implementing callback functions using ctypes

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On Wed, 08 May 2013 04:19:07 -0700, jamadagni wrote:

> I have the below C program spiro.c (obviously a simplified testcase)
> which I compile to a sharedlib using clang -fPIC -shared -o libspiro.so
> spiro.c, sudo cp to /usr/lib and am trying to call from a Python script
> spiro.py using ctypes. However it would seem that the first call to the
> callback results in a segfault.

> # call the C function
> spiro_to_bezier_strict ( src, len ( src ), bc )

This line should be:

  spiro_to_bezier_strict ( src, len ( src ), byref(bc) )

Without the byref(...), it will try to pass a copy of the structure rather
than passing a pointer to it.

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Thread

Help with implementing callback functions using ctypes jamadagni <samjnaa@gmail.com> - 2013-05-08 04:19 -0700
  Re: Help with implementing callback functions using ctypes dieter <dieter@handshake.de> - 2013-05-09 07:54 +0200
  Re: Help with implementing callback functions using ctypes Stefan Behnel <stefan_ml@behnel.de> - 2013-05-09 08:57 +0200
  Re: Help with implementing callback functions using ctypes Nobody <nobody@nowhere.com> - 2013-05-09 19:32 +0100
    Re: Help with implementing callback functions using ctypes jamadagni <samjnaa@gmail.com> - 2013-05-23 20:11 -0700
  Re: Help with implementing callback functions using ctypes Dan Stromberg <drsalists@gmail.com> - 2013-05-23 20:26 -0700
    Re: Help with implementing callback functions using ctypes Shriramana Sharma <samjnaa@gmail.com> - 2013-05-26 09:12 -0700
      RE: Help with implementing callback functions using ctypes Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-26 21:43 +0300
      Re: Help with implementing callback functions using ctypes Dan Stromberg <drsalists@gmail.com> - 2013-05-26 12:10 -0700

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