I am trying to create some Rust bindings to IUP using dynamic linking.
This works fine for iup.{so,dll}.
However, it fails to work for iupim.{so,dll}.
I have a prototype in Python and that had the same problem. However, in
Python I could solve the problem like this:
DLL_ROOT = (pathlib.Path(__file__).parent / 'iup').resolve()
# Windows & error checking code omitted
DLL_ROOT /= 'linux'
iup_dll = DLL_ROOT / 'libiup.so'
iup = ctypes.cdll.LoadLibrary(iup_dll) # Equivalent to Rust's
libloading::Library::new()
The above works. But continuing, this fails:
im_dll = DLL_ROOT / 'libiupim.so'
im = ctypes.cdll.LoadLibrary(im_dll)
However, I can get IM to load by doing this instead:
im_dll = 'iupim' # only the bare name needed in this case
im = ctypes.CDLL(im_dll, handle=iup)
This works because the `handle` refers to the original loaded `iup`
library.
Unfortunately, I don't know how to do the equivalent in Rust. (I've
asked on the Rust forum.)
But I just wondered if other people had had problems with dynamic
loading and if there was another way to do it? Or if anyone has an
example in C or C++ or Rust that loads both IUP and IM?
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